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Патент USA US2266139

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Dec. 16, 1941.
2,266,139 1
L. G. ZUKER'MAN
ULTRA HIGH FREQUENCY ANTENN‘A
‘Filed Feb. 25, 1941
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F/G-l?
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INVENTOR
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A v 2,266,139 1
Patented Dec. '16, 1941
' UNITED STATES = PATENT OFFICE
ULTRA men FREQUENeYANTENuA '
Lester- G. Zukerman, Hollywood, Cali.f.,_assignor
to Lockheed Aircraft Corporation, Burbank,
Calif.
Application February 2 5, 1941, Serial No. 380,516
5 Claims. (01.25043)
This invention relates to an ultra high fre
quency antenna, and/or antenna mast, especially _
adapted for aircraft use; and is intended to pro
vide an improved means of mounting and in
sulating such a mast or antenna from the metal
Skin‘ of an airplane fuselage.
An external radio antenna, whether of the ’
will become apparent as the description of the
invention proceeds.
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. This'invention, in a preferred form is shown in
a the accompanying
drawing, wherein:
‘ Figure I is a fragmentary side view of the‘ nose
of an airplane fuselage in which an antenna em
bodying the features of this invention has been
installed.
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vertical radiator, or horizontal wire type, re
Figure II is an enlarged inside view of the base
quires an electrical lead-in passage which insu
of the mast, as mounted in the fuselage,_ the view
lates the antenna and'its associated transmis 10 being indicated by the section line 11-11 in Fig- .
sion line from the hull or fuselage. The present
invention relates to such a dual purpose insulat
Figure III is a longitudinal section of the an
ing passage, and provides an improved insulating ' tenna, on the line III-J11 of Figure II.
structural mounting for the antenna that‘ is
Figure IV is a fragmentary section through
readily removable and to which various types of w the supporting block, on .the line IV-IV of Fig
antenna can be applied which may be of such
ure III.
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lengths as to tune to the desired ultra high fre
As-shown on the drawing:
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ure I. _
quencies. The mounting of'this invention pro;
vides smoothly faired contours from the ‘stream
lined'mast to the skin of the fuselage, thus mak
ing for low turbulence and low aerodynamic
drag, as well as absence of external crevices and
the like that would facilitate the collection of
dirt which would tend to bridge the dielectric
and therebyreduce the resistance of the_leak
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It' will be appreciated that while the antenna
of this invention is shown as depending from the
lower surface of an airplane fuselage or‘cabin l0,
it is equally adaptable for top or other mount
ings.
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' The usual structure of an all metal fuselage
comprises a skin ll supported by transverse
bulkhead rings l2, and. longitudinals l3, one
age path.
panel thereof being shown in Figure, II, wherein
It is accordingly an object of this invention to
an inner skin panel 14 is arranged to bridge the
provide an improved and simpli?ed means of
panel space between adjacent bulkhead rings to
mounting an end-fed ultra high frequency an
30 provide for clamping the base l5 of an antenna
tenna on an all metal aircraft. The antenna
block [6 against the outer skin II.
is formed as a streamlined shell of sheet metal,
The antenna block 16 is preferably formed by a.
and may be fed by-the inner conductor of a co
axial feeder ‘cable connected thereto through the
_ compression molding process from a plastic hav
ing good dielectric, and the necessary physical
hollow centenof an insulating mounting block.
35 and chemical properties. Polymerized styrene is
The outer conductor of the coaxial feeder cable
an example of a suitable material having ex
connected thereto through the hollow center of.
tremely low loss electrical characteristics. vWhile I
an insulated mounting block. The outer con
the block, as disclosed herein, can be con
ductor of the coaxial cable terminates at the
veniently molded as a single piece, it'is possible
mounting block,>which insulates it from the an 40 to make it as two or more pieces subsequently‘
tenna, so that it can be at ground potential, or
Joined by cementing ‘together. The mast-l6 is
above, as desired. The use of a coaxial cable so
formed as a streamlined cylinder having a cen
I connected to the insulted mast renders the con
‘ tral cored hole H, the cylinder conforming to the
nection impervious to dirt or foreign matter
inside dimensions ofan antenna shell [8 of
which might otherwise affect the electrical char 45 ' streamlined form, the open end‘ of which slips
acteristics of the coupling.
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over the mast and is retained in place we series
It is a further object of this invention to pro
of countersunk 'screws l9 engaging a gang ‘of
vide an improved and simpli?ed dielectric
elastic stop nuts 20 in the central‘hole II. The
moimting block and/or mast for a ?xed antenna, - antenna shell [8 is preferably dimpled for» the
' which block is‘readily applied to and removed
heads of the screws l9, and grooves}! are formed
from the shell or skin of an airplane and which
is adapted to receive interchangeable stream
in the sides of the mast l6 to permit assembly >
and removal of the dimpled shell l8. .
lined antenna. shells tuned to different fre
. It will be noted that the dielectric mast l6 and ‘ ,
quences, which shells are also adapted to support
the corresponding part of the antenna shell ll
conventional wire antennae if so desired.
are of substantially parallel streamlined cylinder ' >
Other and further objects of this invention 65
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2,266,189.
construction, While the balance Of the
tapers to a narrow end while maintaining its
streamline form.
If the mast and shell are to'
be used to support a wire typeof antenna 22, a
plate 23 is welded into the shell near its outer
end, and a connecting link 24 is bolted thereto
to support suitable antenna wires 25. The wire
antenna may use the shell l8 as a lead in, or a separate lead-in wire 26 may be used as shown '
if the antenna shell I8 is to be used in a separate
circuit.
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The shell I8 is electrically connected to a cen
tral pin 21 in 'a detachable‘plug receptacle 28
by means of an extension piece 29 carrying a nut -
engaged by the innermost screw 30 shown in Fig
ure IV.
and
means therefor. comprising a di- I
electric member having an outstanding projec
tion adapted to telescope into said radiator shell ’
and ‘a base adapted to be secured to a supporting
surface in faired relationship to the radiator sup
porting projection, and means providing a de
tachable electrical connection from said radiatorv
shell to the interior surface of said dielectric base.
2. An antenna mast construction comprising a ,
base member of dielectric material adapted to be
?llsh mounted relative to its vehicle, a stream
lined cylinder of said material projecting out
wardly from the base member and having a pas
sage therethrough, gang nuts arranged in said
passage, an ultra high frequency antenna com- '
The receptacle 28 is mounted in an en
prising a shell adapted to be engaged over said
largement of'the central hole in the mast l6,
streamlined cylinder and removably secured to
being exposed on the inner surface of the base
said gang nuts through the material of said mem
15. With this varrangement the electrical con
nection can be broken at the receptacle 28 and 20 her, and a lead-in connection extending through ‘
the dielectric material to a connection with said
_ the various screws l9 and 30 removed to remove
the antenna shell l8, which shell can be replaced
3. An ultra high frequency radio radiator com- ,,
with another, tuned to a different wave length.
prising a streamlined shell, and mounting means
The base and mast can also be removed from the
for supporting said shell in insulated relation-,
skin of the fuselage and replaced by a closure‘
ship to the skin of an all metal airplane, com
using the same screw holes: that mounted the
prising a passaged base of dielectric material
. base I5.
secured to said skin and having an outwardly
Inasmuch as the cylindrical portion of the
projecting mast engaging said radiator shell
mast l6 acts as a cantilever beam, material may
conveniently be removed from. the trailing edge 30 whereby to support the same in insulated rela
as at 3|, without affecting the strength, as a full _ tionship to said skin, side channels formed in
said mast-to receive dimples formed in the shell,
bearing surface would still remain ahead of the
countersunk fastening means extending from
major diameter normal to the streamline axis.
shell.
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said . dimples to the passage ‘in said base and
‘It will be noted that the assembly, installation,
mast, and ‘a lead-in connection extending through
said passaged base into electrical connection with
and servicing of this unit and its electrical con
nections is especially convenient. It is desirable,
but not necessary to add reinforcement 32 to the
inside of the skin H, about the aperture therein ’
through which the mast projects, and to provide
a rubber-like gasket 33 between the skin and the
base l5 of the dielectric. The completely assem
bled mast may be inserted into position from the
inside of the fuselage and bolted in place by
one of said fastening means.
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4. An ultra high frequency radio radiator com
prising a streamlined shell, and mounting means
for removably supporting said shell ininsulated
relationship to the skin of an all metal airplane,
comprising a passaged base of dielectric material
removably secured to said skin and having an
screws and nuts 34 extending through the skin, ' voutwardly projecting mast removably enveloped
by said radiator shell whereby to support the
gasket, base I5, and innerv skin M, to clamp the
assembly together; the inner skin being addition-' ' same in insulated relationship to said skin, fas
tening means extending. from the shell to the
~ ally secured to the bulkhead rings l2.
passage in said mast. and a lead-in connection
It will thus be seen that I have invented an
improved and simpli?ed ultra high frequency an
tenna, which can also be used as a mast support
ing wire antennae for other frequencies.
Having thus described my invention and the.
present preferred'embodiment thereof, I desire
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‘a just interpretation of the following claims.
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tening means extending transversely from said.
' 1.'An antenna mast construction, comprising
shell, and a lead-in-wire connection insulated
a streamlined radiator shell of the desired ultra
vhigh frequency characteristics, and supporting
ing means.
5. An airplane radio antenna radiator compris
ing a streamlined'shell, and supporting means
therefor comprising a dielectric having a base
secured to the skin of said airplane and a stream
lined projection ?tting into the base of said shell,
said dielectric being apertured for removable fas
' to emphasize the fact that many modi?cations
may be resorted to in a manner limited only‘by
I claim:
extending through said passaged base into de
tachable electrical connection with said fasten
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from the skin 01’ the airplane.
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LESTER G. ZUKERMAN.
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