Патент USA US2266139код для вставки
Dec. 16, 1941. 2,266,139 1 L. G. ZUKER'MAN ULTRA HIGH FREQUENCY ANTENN‘A ‘Filed Feb. 25, 1941 32. / / 27/ ' 8 34 F/G-l? ~ INVENTOR , .- - . , 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. '. - > _ ' . 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. ‘ _ 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. _ v lengths as to tune to the desired ultra high fre As-shown on the drawing: , . 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 ‘ . . 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. . - . _ - ' 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. - ' _' 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 2 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. , 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. i . I ' ~ 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. ' 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 50 ‘a just interpretation of the following claims. _ ~ 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 60 from the skin 01’ the airplane. ' - LESTER G. ZUKERMAN.