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Патент USA US2400752

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May 21, 1946.
I
_
.A. v. HAEFF
v
ELECTRON DISCHARGE DEVICE
Filed April 4, 1942
INVENTOR
Patented May 21, 1946
. 2,400,752.
2,400,752
ELECTRON DISCHARGE DEVICE
Andrew V. Hae?", Washington, D. (3., assignor to
Radio Corporation of America; a corporation of
Delaware
Application April 4, 1942, Serial N 0. 437,634
16 Claims. (Cl. 250-27,.5')
My invention relates to electron discharge de
cuits. ‘However, as the ‘higher frequencies are
approached the lead impedances which are com
vices and associated circuits particularly suitable
for use at ultra-high frequencies.
mon to two circuits and the inter-electrode ca.
pacitances may cause excessive coupling between
As the ‘higher frequencies are approached in
the circuits and thus become the limiting fac
ter-electrode capacities, inductance of electrode
tors in the operation of such devices. "There
leads and capacitance between leads and between
fore, for satisfactory operation of these devices
the electrodes and associated circuit elements be
come factors materially a?ecting operation of
it is essential that the coupling ‘between cir
cuits and thus the energy feedback vbe under sub
desirable and uncontrolled coupling between in 10 stantially absolute control.
It is one of the principal vobjects of my in
put circuits and other circuits associated with
vention to provide an electron discharge device
the electrode system.
and circuit particularly suitable for use at ultra
There has recently come into use, particularly
tubes and circuits. These factors may cause un
for high frequency operation, electron discharge
high frequencies.
Another object of my invention is to provide
devices utilizing a controlled beam of electrons. 15
such .a device in which the :electrode lead im~
In these devices the electron beam is controlled
pedance and the inter-electrode capacitance can
either by a conventional grid electrode or by
be neutralized or substantially eliminated :to in
means of an electrode which is an integral part
sure operation v.of the device at ultra high fre
of a wall of a resonant cavity and the energy
is extracted from the modulated beam by pro 20 quencies.
More speci?cally it is an object of my inven
jecting the ‘beam through one or several resonant
tion to provide such a device utilizing concen
cavities.
tric ‘lines and resonant cavity tank circuits in
In one form .of such tube an evacuated elon
which the electrode leads are merged into .the
gated envelope vhas positioned at one end a cath
ode and control grid and at the other end a col 25 tank circuits to eliminate the effects of a common
lead impedance and capacity between electrodes
lector. Between the grid and collector are posi
and the tank circuits.
tioned two accelerator electrodes and a resonant
cavity output tank circuit through which the
Asti'll further object of ‘my invention is to pro
electron stream passes on its way from the cath
vide such an electron discharge device and asso
ode to the collector. A concentric ‘line input .cir 30 ciated circuit in which the transfer of energy
to the input circuit from following circuits can
coil: is connected between the cathode and the
be controlled so as to control the input loading
control grid and this concentric line is in turn
as well as regeneration or degeneration present
surrounded by another resonant cavity circuit
terminating at the control grid and the ?rst :ac
in the device.
celerator electrode. The grid and cathode leads 35 The novel features which I believe to be char
extend through the envelope and are electrically
acteristic .of my invention are set forth with par
connected vto the concentric conductors forming
ticularity in the appended claims, but the inven
the concentric line input circuit. With this ar
tion itself will vbest ‘be understood by reference to
the following description taken in connection
rangement, ‘however, the grid leads may provide
a common coupling impedance between the in
with the accompanying drawing in which Figure
1 is a schematic longitudinal section of an elec
put, or cathode-control grid circuit, and the cir
tron discharge device and associatedcircuitmade
cuit associated with the accelerator electrode, so
that energy interchange may take place between
according to ‘my invention, ‘Figure 2 is ‘a section
the two circuits through ‘this common impedance.
taken along ‘the line 2+2 .of ‘Figure 1 showing
Depending upon the phase relationship between 45 details of the lead arrangement of the device,
the input signal voltage and the voltagefed back
and Figure ‘3 is a schematic diagram represent
to the input circuit from the accelerator circuit, ' ing the equivalent‘ circuit of 'the device shown
regeneration or degeneration may take place,
in Figure 1.
Referring to ‘Figure l, I provide :an evacuated
causing either unwantedoscillations or exces
siVe positive or negative damping of the input 50 elongated envelope in having atone end an 'in
circuit.
directly heated cathode ll, control grid l2 and
Tubes of the kind described are primarily de
at the .other end a collector 13. Positioned be
signed to eliminate .or 'to control input loading
tween the .»grid and collector is .a screening and
accelerating electrode 14 and accelerating .elec
and to reduce ohmic and radiation losses by the
use of concentric line and resonant cavity cir 55 trode I5, a suppressor l6 ‘being provided within
2
2,400,752
the collector for suppressing secondary electron-v
emission from collector l3.
Surrounding the envelope and the discharge
means of the leads 40-4! connected to the poten
tial source 42 and, if desired, the grid may be
biased with respect to cathode by means of the
path between the cathode and collector is the
resonant cavity output tank circuit I‘! provided
with a gap l8 surrounding the discharge path.
potential source 46 and by means of a biasing
resistor 46' or by either alone. It is noted that
Energy is delivered ‘to this resonant cavity tank
respect to cathode and grid) _ to be applied to
the insulating collar 32 permits high voltage (with
circuit when a modulated stream of electrons
tank circuit H from the voltage source 41, the
passes across this gap as described in my Patent
collector and suppressor voltages being supplied
No. 2,237,878. Energy‘ is fed to an output by 10 by source 48. The collector is usually maintained
means of coupling loop [9. The accelerating elec
at a lower potential than the tank circuit and the
trode I4 may be electrically connected to the tank
suppressor ring l6 at a still lower potential.
circuit I‘! by means of radial leads 20 and the ac
Because of the concentric arrangement of the
celerator 15 may be connected to the tank circuit
control grid leads which form part of the walls
by means of the lead 2|. '
'
'
'
15 of the‘ concentric line circuits, the inherent in
In accordance with my invention, in order to
ductive coupling between the screen electrode
prevent undesirable coupling between other cir
control grid circuit and the control grid-cathode"
cuits and the input circuit connected to the cath
circuit is reduced to a negligible value even
ode H and control grid 12, the grid 12 is provided
though the physical length of the control grid
with a collar l2’ to which is secured a plurality of 20 leads is long compared to operating wavelength.
leads 2‘! which form a screen around the cathode
Coupling due to capacitance between cathode and
I I, and the cathode leads 26 and the heater lead
screen can be reduced to any desired value by
25 arranged as is shown in Figure 2. The grid
using a high mu grid and a su?icient number of
leads act to shield the cathode leads, and the
grid leads. The position of the heater leads and
cathode leads in turn shield the heater lead from 25 grid leads serves to minimize coupling from the
the grid-cathode circuit to prevent undesirable
grid-cathode circuit to the heater circuit and thus
coupling therebetween and thus eliminate the
obviates the necessity of using internal by-pass
necessity for providing by-passing condensers.
condensers betweenthe heater and the cathode
Closely adjacent the end-wall of the tube en~
leads. The concentric arrangement thus elimi
velopeand surrounding the cathode and heater 30 nates undesired coupling due to the lead im
leads and their extensions is the tubular member
pedance. The feedback of the energy from the
29 electrically connected to the grid leads 2'!
screen grid circuit to the cathode circuit is accom
by means of the connecting clips 23. The reso
plished by means ofcontrollable coupling loop 39.
nant circuit connected between the grid [2 and
Thus in accordance with my invention by the
accelerating electrode 14 is completed by means of 35 use of a concentric lead arrangement for the
outer tubular member 30 electrically connected
cathode and grid and by merging these leads into
to member 29 by means of the end disc 3|. The
the concentric type resonantcavity tank circuits
open end of the tubular member 30 is capacitively
proper, it is possible to eliminate common lead
coupled to an extension 33 on the resonant cavity
impedance between the input circuit and the
tank circuit 11. This member 33 extends from the
screen grid or ?rst accelerator electrode circuit,
vertical wall [1' and the open end of member 33
thus preventing undesired coupling. Control of
is electrically insulated therefrom by insulating
the regeneration or degeneration is provided for
collar 32. The resonant circuit between grid and
by means of an adjustable coupling device be
accelerator electrodes thus comprises collar 12', '
tween the input circuit and other circuits and by
grid leads 21, connectors 28, tubular member 23, 45 means‘of tuning arrangements permitting indi
disc 3|, tubular member 30, collar 33, wall ll’
vidual tuning of the circuits involved.
connections 20 and electrode M. 'R.-F. voltages
Figure 3 discloses an equivalent circuit diagram
and currents induced within this resonant cavity
of the tube shown in Figure 1. Elements C, G
circuit con?ne themselves. to the inner surfaces
and SG represent, respectively, cathode, grid and
forming the chamber. of the resonant cavity and 50 screen and accelerating electrodes, capacitances
the surface of the grid leads facing the interior of
Cs——g and CH; represent the capacitances between
the chamber. , If the grid leads do not sufficiently
the screen grid and the control grid and between
screen the cathode-grid circuit to be described,
the control grid and the cathode. The imped
their number may be increased so that the cou
ances Lg and Le represent the grid lead impedance
pling. between the inner chamber of the resonant 55 and the cathode lead impedance connected in se
cavity and the grid-cathode circuit is practically
ries with Zs-g representing the impedance of the
tank circuit‘between thescreen grid and control
nil, This resonant cavity may be tuned by means
of the collar-like conducting member or shorting
condenser 30’ movable longitudinally within the
grid and Zc-g representing the impedance of the
tankcircuit' connected between the cathode and
60 control grid, the coupling element Lrepresenting
resonant cavity.
'
The grid-cathode or input tank circuit com
the coupling element 39 for controlling energy
prises the outer tubular member 29 and the inner
feedback between the control grid-screen. elec
tubular member 35 capacitively coupled to the
trode tank circuit and the cathode-control grid
cathode ‘leads 26 by means of the cup-shaped cap
tank circuit.
'
In operation electrons furnished by the indi
43 insulated from the tubular member 35 by 65
rectly heated cathode pass through the grid I2
means of insulating collar 44. Member 29 is
closed by means of the disc 36. The concentric
in the form of a beam to be modulated by the
grid, are accelerated through the screen and ac~
line circuit formed by conductors 29 and 35 is
tuned by means of the longitudinally moving col- celerating electrode I 4, pass gap H3 in the reso
lar 31. Desired input may be fed into cathode 70 nant cavity tank circuit l1, through the accelera
grid circuit by means of coupling loop 38. The
tor-screen l5, and are ?nally collected by collec
heater lead is by-passed for R. F. by means of
tor’ [3. Secondary electrons are prevented from
leaving the collector by means of suppressor ring
plunger member 45 insulatingly supported Within
16 maintained at a, lower potential than collec
the tubular member. 35.
The cathode heating current is supplied by
tor l3.
a
"2,400,752
The concentric line input tank‘ circuit con
nected between the cathode and grid, and com
prising the tubular members 29. and 35 closed by
plate member‘ 36 is energized by means of the
coupling loop 38. The alternating voltage re
sulting between the grid l2 and cathode I l modu
lates the electron stream prior to its passage
through the screen and accelerating electrode M,
the energy being extracted from the modulated
stream as the electrons pass the gap 18 in man
ner, now well known, by inductive action. The
action which takes place is described in more de
3
transmission line for ampli?cation purposes or
may be fed directly into the antenna. ‘
While I have indicated the preferred embodi
ments of my invention of which I am now aware
and have also indicated. only one speci?c applica
tion for which my invention may be employed‘, it
will be apparent that my invention is. by no means
limited to the exact forms illustrated or the use
indicated, but. that. many variations may be made
in. the particular structure used and the purpose
for which it. is. employed without departing from
the scope of my invention as set forth in the ap
pended claims.
tail in my Patent No. 2,237,878 issued April 8,
What I claim as new is:
1941. The high frequency ?eld resulting from
1. An electron discharge device having an en
excitation by means of loop 38. is con?ned within 15
velope containing a cathode for supplying elec
the concentric line resonant cavity tank circuit,
trons, a control grid electrode and another elec
the grid leads 2'! and the cathode leads 26 form
ing continuations of the wall of’ the tubular mem
bers 2'9 and 35 forming part of the resonant cav
ity.
trode in the order named, a conductor for said
cathode; extending through said envelope, said
20 grid electrode‘ having a shielding surface to
.
The arrangement shown. at 45, lid and 43. per
mits capacity coupling for R. F. between the
cathode and the tubular member 35 but at the
same time permits direct voltages to be applied
shield said cathode from the other electrode and
provided with conducting and supporting means
extending through said envelope, a cavity reso
nator surrounding said envelope and coupled be
to the cathode heater for heating the same.
25 tween said control grid electrode and said other
Tuning of the input circuit is accomplished by
electrode, and including a conducting member
coaxial with said control grid electrode and-con
means of the tuning cylinder 37-, the position of
tacting‘ said conducting and supporting means
which along the line is adjusted for optimum op
erating conditions. In passing across the gap
close to the outside Wall of said envelope, said
between the control grid I2 and accelerator elec 30 conducting and supporting means forming a con
trode i4, sufficient energy may be extracted to
tinuation of the wall of said cavity resonator, and
maintainthe resonant cavity: tank circuit cou
a cathode-grid circuit connected between said
pied between the control grid and accelerator
cathode andv grid, and feedback means coupling
electrode excited. The R. F. voltage appearing
said resonator with said circuit for controlling
across l2 and It may serve to further modulate 35 the energy feedback from said cavity resonator
the stream and the energy can be fed through. 39
to said cathode-grid circuit.
to provide the desired degree of regeneration.
2. An electron discharge device having an en
The resonant circuit between l2 and it may be
velope containing a cathode for supplying elec
tuned to resonance for optimum conditions by
trons, a control grid electrode and another elec
means of the tuning collar 36'.
Because of the 40 trode in the order named, a conductor for said
comparatively complete shielding between the
cathode and accelerating electrodes, there is no
common coupling except for the small coupling
duev to capacity of cathode H and accelerating
electrode M, which can be compensated for by
proper tuning of the circuits. Control of trans
for of energy between the input. circuit and the
cathode extending through said envelope, said
control grid electrode having a shielding surface
to shield said cathode from the other electrode
and provided with conducting and supporting
means extending through said envelope, a cavity
resonator surrounding said envelope and coupled
between said control grid electrode and said other
screen-control grid circuit can then be accom
electrode, and including a conducting member
coaxial with said control grid electrode and con
tion of which may be varied to control the 50 tacting said conducting and supporting means
amount of coupling. The by-pass condenser
close to the outside wall of said envelope, said
formed by collar 33 and insulating collar 32 per
conducting and supporting means forming a con
mits the tubular members 39, 2.9 and 35 all to be
tinuation of the wall of said cavity resonator, and
maintained at a direct current potential di?erent
a cathode-grid circuit connected between said
from the potential of the tank circuit H and col
cathode and grid.
lector l3, while at the same. time providing a low
3. An electron discharge device having an en
impedance path for radio frequency currents.
velope containing a cathode for supplying elec
It will be observed that the grid leads 2“! form
trons, a control grid electrode and another elec- '
a common wall between the two resonant cavity
trode within said envelope in the order named,
tank circuits. Since radio frequency voltages
a lead for said cathode, said control grid electrode
and currents of each cavity are con?ned within
having a shielding surface to shield said cathode
the cavity, this common wall although formed by
and cathode lead from the other electrode and
plished by means of a coupling coil 39, the posi
leads closely spaced substantially completely
shields the. two resonant cavities from each other
and prevents a common coupling. Proper and
su?icient shielding is accomplished by the use of
a su?lcient number of grid leads.
I
The grid [2 is maintained at a negative poten
tial with respect to the cathode by means of the
voltage source 455 and in operation the grid is
maintained at ground R. F. potential While the
cathode is swung with respect to the grid to
produce modulation of the electron stream. The
output is‘ taken from the resonant cavity I‘! by
provided with conducting and supporting means
extending through said envelope, a cavity reso
nator surrounding said envelope and coupled be
tween said control grid electrode and said other
electrode and including a conducting member
coaxial with said control grid electrode, and con
tacting said conducting and supporting means
close to the outside wall of said envelope, said
conducting and supporting means forming a con
tinuation of the wall of said cavity resonator
and a control grid electrode-cathode cavity reso
nator ‘coupled between said cathode and control
means of the couplingloop l9 and can be fed too. 75 grid electrode, and means coupling said resonators
4
2,400,762
together for controlling the energy transferred
tween said cathode and control grid electrode,
from one cavity resonator to the other cavity res
and means ‘coupled between said resonators for
controlling the energy transferred from one cav
onator.‘
'
'
__
'
4. An electron discharge device having an en
velope containing a cathode for supplying elec
trons, a control'grid electrode and another elec
trode within said envelope in the order named, a
conductor for said cathode extending through
said envelope, said control grid electrode having
ity resonator to the other cavity resonator, said
other electrode and said cavity resonator cou
pled thereto being insulatingly separated to per
mit different direct voltages to be applied to said
other electrode and to the cavity resonator cou
pled to said other electrode.
7. An electron discharge device having an en
a shielding surface to shield'said cathode from 10
velope containing a cathode for supplying elec
the other electrode and provided with conducting
and supporting means extending through said
trons, a control grid electrode and an accelerat
envelope, a cavity resonator surrounding said en
ing and screening ‘electrode, and a collector elec
velope and coupled between said control grid elec
trode within said envelope inthe order named,
trode and said other electrode and including‘a
conducting member coaxial with said control
a lead for said cathode, said control grid elec
trode having a shielding surface to shield said
cathode and cathode lead from said screen and
accelerating electrode and provided with conduct
ing and supporting means extending through said
envelope, a cavity resonator surrounding said en
velope and coupled between said control grid elec
trode and said accelerating and screen electrode,
and including a conducting member coaxial with
said control grid electrode and contacting said
conducting and supporting means close to the
wall of said envelope, said conducting and'sup
grid electrode, and contacting said conducting
and supporting means close to the outside wall
of said envelope, said conducting and support
ing means forming a continuation of the wall of
said cavity resonator and a, control grid electrode
cathode cavity resonator coupled between said
‘cathode and control grid electrode, said cavity
resonator coupled between the cathode and grid
comprising a concentric line having the inner
conductor coupled to said cathode conductor and
the outer conductor connected to said grid, and '
means coupling said resonators together for con
trolling the energy transferred from one cavity
30
resonator to the other cavity resonator.
5. An electron discharge device having an en;
velope containing a cathode for supplying elec
trons, a control ‘grid electrode and another elec
trode within said envelope in the order named,
a conductor for said cathode extending through
said envelope, said control grid electrode having
a shielding surface to shield said cathode from
porting means forming a continuation of the wall
of said cavity resonator and a cathode-control
grid electrode circuit coupled between said cath
ode and ‘control grid electrode and feedback
means coupling said resonator with said circuit
for controlling the energy fed back from said
cavity resonator to said cathode-control grid elec
trode circuit.
‘
8. An electron discharge device having an en
velope, a cathode, control grid electrode, accel
crating electrode andcollector electrode within
said envelope and positioned in the order named,
the other electrode and provided with conducting
and a lead for said cathode, said control grid elec—
and supporting means extending through said
envelope, acavity resonator surrounding said en 40 trode enclosing said cathode and cathode lead
and having a lead construction extending outside
velope and coupled between said control grid
said envelope, a cavity resonator surrounding said
electrode and said other electrode and including
envelope and coupled between'said control grid
a conducting member coaxial with said control
electrode and said accelerating electrode, and in
grid electrode, and contacting said conducting
cluding a tubular member coaxial with said grid
and supporting means close to the outside wall
and electrically coupled tosaid grid lead con
of said envelope, said conducting and supporting
struction close to the wall of said envelope, said
means forming a'continuation of the wall of said
grid lead construction forming a continuation of
cavity resonator and a control grid electrode
the wall of said cavity resonator, a cathode-grid
cathode cavity resonator coupled between said
‘ cathode and control grid electrode, said‘ cavity 5.0 cavity resonator connected between said cathode
and grid, said tubular member forming a com
resonator coupled between the cathode and con
mon wall between said cavity resonators, and
trol grid electrode comprising a concentric line
feedback means coupled between said resonators
having the inner conductor coupled'to said cath
for controlling the energy transfer between said
ode conductor and the outer conductor connected
55 cavity resonators.
to said control grid electrode.
_
6. An electron discharge device having an'en
velope containing a cathode'for supplying elec
9. An electron discharge device having an en
velope, a cathode, control grid electrode, acceler
ating electrode and collector electrode within said
envelope and positioned in the order named, and
trode within said envelope in the order named,
conducting and supporting means for said cath 60 leads for said cathode, said control grid elec
trode enclosing said cathode and cathode leads
ode extending through said envelope, said con
and provided with leads extending outside said
trol grid electrode having shielding surfaces to
envelope, a cavity resonator surrounding said en
shield said cathode from the other electrode and
velope and coupled between said control grid elec
provided with conducting and supporting means
extending through said envelope, a cavity res 65 trode and said accelerating electrode, and includ
ing 'a tubular member coaxial with said grid and
onator surrounding said envelope and coupled be
electrically coupled to said grid leads close to the
tween said control grid electrode and said other
wall of said envelope,jsaid grid leads forming a
electrode and including a conducting member co
continuation of the wall of said cavity resonator,
axial with said control grid electrode and con
tacting said control grid electrode conducting and 70 and a cathode-control grid cavity resonator con
nected between‘ said cathode and control grid
supporting means close to the wall of said en-.
velope, said conducting. and supporting 'means
electrode, said last cavity resonator including a
forming a continuation of the wall of said cavity
conducting member coaxial with and inside said
tubular member and electricallycoupled to said
resonator, and a control grid electrode-cathode
circuit comprising a cavity resonator coupled be
cathode leads, and conducting means positioned '
' trons, a control grid electrode and another elec
2,400,752
between said tubular member and said coaxial
member and movable longitudinally thereof for
tuning said cathode-control grid electrode cavity
resonator.
10. An electron discharge device having an
elongated envelope containing a cathode, control
Y5
aicontinuation or the wall of‘the cavity resonator
last mentioned, ‘and a conducting member co~
axial and within said inner tubular member and
electrically coupled to said cathode, and means
connecting said inner tubular member and the
grid and a screen electrode, and a collector elec
conducting member within said inner tubular
member providing a cavity resonator connected
trode in the order named, said cathode being pro
between the cathode and the grid, and means
vided with a plurality of leads mounted in a
coupling the accelerating electrode-control grid
circle and extending through the end of said en 10 cavity resonator and the cavity resonator con
nected between the control grid and cathode.
velope, said control grid having a plurality of
>13. An electron discharge vdevice having an
leads ‘lying in a circle surrounding said cathode
elongated envelope and having at one end a cath
leads for shielding said cathode leads, a radially
ode, control grid and accelerating electrode in
extending conducting support connected to said
screen electrode and extending through the wall 15 the order named, and a collector in the other end
of said envelope, said cathode being provided ‘with
of said envelope, a tubular member coaxial with
leads extending from the end wall of the enve
the longitudinal axis of said envelopeand extend
lope, and ‘said control grid having a lead con~
ing close to the envelope wall and electrically
struction surrounding the cathode leads and ex
connected to the radially extending conducting
support, a cavity resonator coupled between said 20 tending through the wall of the envelope, said
accelerating electrode having radially extending
screen electrode and said tubular member, and a
conducting and supporting means extending
circuit connected between said tubular member
through the wall of the envelope, a cavity reso_
and said cathode.
nator surrounding said cathode and grid and
11. An electron discharge device having an
coupled between said accelerating electrode and
elongated envelope and having at one end a cath
said control grid and having ‘an inner tubular
ode, control grid and accelerating electrode in
member concentric and coaxialwith the longitu
the order named, and a collector in the other end
dinal axis of the envelope and electrically con
of said envelope, said cathode being provided with
nected to the grid lead construction adjacent the
loads extending from the end 'wall of the enve
wall of the envelope, whereby said grid lead con
lope, and said grid having a lead construction sur
struction forms a continutaionof the Wall of the
rounding the cathode leads and extending
cavity resonator last mentioned, and a conduct
through the wall of the envelope of said device,
ing member coaxial and within 'said inner tubular
said accelerating electrode having a radially ex
member and electrically coupled to said cathode
tending conducting and supporting means ex
tending through the wall of the envelope, a cavity 35 and means connecting said inner tubular mem
ber and the conducting member within said inner
resonator having a gap surrounding the dis
tubular member providing a cavity resonator
charge path between the accelerating electrode
connected between the cathode and the control
and the collector, a cavity resonator surrounding
grid, means within said accelerating electrode
said cathode and grid and coupled between said
accelerating electrode and said grid and having 40 control grid resonator for tuning said accelerat-~
ing electrode-control grid resonator, and other
an inner member concentric and coaxial with the
means within said control grid-cathode resonator
longitudinal axis of the envelope and electrically
connected to the grid lead construction adjacent
the wall of the envelope, whereby said control
grid lead construction forms a continuation of
the wall of the cavity resonator last mentioned,
and circuit means connected between the cathode
and said inner member providing an input cir
cuit connected between the cathode and the con
trol grid, and feedback means coupling the ac 60
for tuning said control grid-cathode resonator.
14. An electron discharge device having an en
velope and containing a cathode, control grid,
screen electrode and a collector electrode in the
order named, said cathode being provided with a
lead system extending through the end wall of
the envelope, said control grid being provided with
a lead construction lying in a circle around the
cathode lead system, a cavity resonator having
a gap surrounding the discharge path between
the screen electrode and the collector electrode,
and a radially extending conducting and support
elongated envelope and having at one end a 65 ing means for said screen electrode extending
through the wall of the envelope, a ?rst tubular
cathode, control grid and accelerating electrode
member coaxial with said envelope and extend
in the order named, and a collector in the other
ing closely adjacent the envelope wall around said
end of said envelope, said cathode being pro
control grid lead construction and electrically
vided with leads extending from the end wall of
coupled thereto, and a second tubular member
the envelope, and said control grid having a lead
surrounding said ?rst tubular member and pro»
construction surrounding the cathode leads and
viding therewith a concentric line circuit, coupled
extending through the wall of the envelope, said
between the control grid and the screen electrode
accelerating electrode having radially extending
celerating electrode-control grid cavity resonator
with the circuit connected between the control
grid and cathode.
12. An electron discharge device having an
conducting and supporting means extending
through the wall of the envelope, a cavity reso
nator having a gap surrounding the discharge
path between the accelerating electrode and the
collector, a cavity resonator surrounding said
cathode and grid and coupled between said ac
celerating electrode and said control grid and
having an inner tubular member concentric and
coaxial with the longitudinal axis of the envelope
and electrically connected to the control grid
lead construction adjacent the wall of the en
through said radially extending conducting and
supporting means, the control grid lead construc
tion forming part of the wall of the concentric
line circuit, and a conducting member coaxial
with and inside said ?rst tubular member and
electrically coupled to said cathode lead system,
and forming with said ?rst tubular member an
input cavity resonator connected between the
control grid and the cathode.
15. An electron discharge device having an en
velope and containing a cathode, control grid,
velope, whereby said grid lead construction forms 75 screen electrode and a collector electrode in the
6
2,400,752
order named, said cathode being provided with a
lead system extending through the end wall of
the envelope, said control grid being provided
with a lead construction lying in a circle around
the cathode lead system, a cavity resonator hav
ing a gap surrounding the discharge path be
tween the screen electrode and the collector elec4
trade, and a radially extending conducting and
order named, said cathode being provided with'a
lead system extending through the end wall of ‘
the envelope, said grid being provided with a lead
construction lying in a circle around the cath
V ode lead system, a cavity resonator having a gap
surrounding the discharge path , between the
screen electrode and the collector electrode, and
a radially extending conducting and supporting
supporting means for said screen electrode ex
means for said screen electrode extending through
tending through the wall of the envelope, a ?rst 10 the wall of the envelope, a ?rst tubular member
tubular member coaxial with said envelope and
coaxial with said envelope and extending closely
extending closely adjacent the envelope wall
adjacent; the envelope wall around said control
around said control grid lead construction and
grid lead construction and electrically coupled
electrically coupled thereto, and a second tubu
thereto, and a second tubular member surround
lar member surrounding said ?rst tubular mem-v
ing said‘?rst tubular member and providing
ber and providing therewith a concentric line cir
therewith a concentric line circuit coupled be
cuit coupled between the control grid and'the
tween the control grid and the screen electrode
screen electrode through said radially extending
conducting and supporting means, the grid lead
construction forming part of the wall of the con
centric line circuit, and a member coaxial with
and inside said ?rst tubular member and else
trically coupled to said cathode lead system, and
through said radially extending conducting and
supporting means, the grid lead construction
forming part of the wall of the concentric line
circuit, and a conducting member coaxial with
and inside said ?rst tubular member and elec
trically coupled to said cathode lead system, and
forming with said ?rst tubular member an input
forming with said ?rst tubular member an input
cavity resonator connected between the control 25 cavity resonator connected between the control
grid and the cathode, and means within said con~
grid and the cathode, and means coupling said
centric line circuit and means within the cathode
screen electrode-control grid concentric line cir
control grid cavity resonator for individually
»cuit with said control grid-cathode cavity res
tuning the screen electrode-control grid circuit’
onator for controlling the feedback of energy
and the cathode-control grid cavity resonator._
16. An electron discharge device having an en
velope and containing a cathode, control grid,’
screen electrode and a collector electrode in the
30 from the screen electrode-control grid concen
tric line circuit to the control grid-cathode cavity
resonator.
'
7
ANDREW V. HAEFF'.
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