US2445336A

US2445336A - Antenna mounting

Info

Publication number: US2445336A
Application number: US674409A
Authority: US
Inventors: Rauch Alexander
Original assignee: US SEC WAR
Current assignee: United States, WAR, Secretary of; US SEC WAR
Priority date: 1946-06-05
Filing date: 1946-06-05
Publication date: 1948-07-20
Anticipated expiration: 1965-07-20

Description

July 20, 1948.

A. RAUCH ANTENNA MOUNTING Filed June 5, 1946 3 Sheets-Sheet. l

3mm ALEXA NDER RAU CH July 20, 1948.

A. RAUCH 2,445,336

ANTENNA MOUNTING Filed June 5, 1946 3 Sheets-Sheet 2 gvwmwto'o ALEXANDER RAUCH Woman;

A. RAUCH ANTENNA MOUNTING July 20, 1948.

Filed June 5, 1946 3 Sheets-Sheet 3 Mini 1 3mm ALEXANDER R'AUCH FIG.3.

Patented July 20, 1948 ANTENNA MOUNTING Alexander Ranch; Eatontown, N. J'.,. assignor to;

the United States :of America as representedlbythe Secretaryoi-War Application June 5, 1946, Serial No. 674,409

(Granted under the act of March 3;.1883, as amended April 30, 1928; 3700. G. 757) 3 Claims.

The invention described herein may be manufaoturedandused by-or for the Government for governmental purposes, without the payment to me eor-1 anyroyalty thereon.

The invention relates to antennas and particularly -to; bieonical. antenna assembly mountings.

Antenna assemblies designed for field useare subjectedtto extremely rough usage. It is there fore an obl'not of the invention to provide an antennasmounting-that shall .berugged, durable and compact.

Itistanother object of. the-invention to provide an antennaemountingassembly that shall bewaterprooi..

lltais a further object of the invention to-providewan ,antennar assembly that shall include a minimum ofparts; inorder that repairs may quiclel ndeasily be made.

3 185513111: further object of the invention to provide; an antennathat may quickly beadapted to. operate on 'alarge number of frequency bands.

Thesexobiects; together with otherv objects and advantagesgofi the invention which will be apparent to one skilled in the art, are achieved in one embodiment. of the invention by means of an axially sy-mmetrical assembly including a metallic head having -at least threeupwardly and outwardlyextending; radiator sockets formed there identica -metallic, annular'base plate having at least thfreedownwardly and outwardly extendingmadiatopsockets said head sockets and said plate-sockets forming the, same angle with the axis of the assembly. The antenna is fed by means: of;a coaxial cable, the outer conductor of said cable being oonnected to thebase. plate and the inner conductor being connected-to the head. Annular. dielectric spacers and rubber washers araprovided between. all matingsurfaces in order to bothrinsulatetthe,assembly electrically and to shock mou-ntand waterproof the-assembly. Th'e inner v conductor of. the coaxial cable extends through 1thexassembly to engage the head electrical-1y:- and-mechanically,theinner conductor thus servingbnthiato. electrically feed the head'and to drawitheassembly-together rigidly.

E01: at better. understanding of the invention reference-is made to thefollowing specification ofoneembodiment of the invention, the said 2; Figure 3 is an exploded view. of. oneieature ,oi. theinvention Figured. isaview. of another, feature or .the ;in.-

vention.

Referring toihe drawings, thereisshoWna bi:

conical antennal comprising an .upper cone: consisting oftliree iedradiators, l9- anda lower cone. The

tively threadably mounted in three, radiator. re-

ceptacles it; The receptacles. l6 are, disposed.

apart aboutthe, tapered undersurface, 1810f. an annular, axially apertured baseplate 20;,andv extend outwardly and downwardly at thesame angle to thevertical that exists between the fed radiators H3 and theverticaln The base plate 253,. formed of. anelectrically conductive material, is-providedwith a flatuppersurface 22,and with a. pyramid-like lower surface consisting of a flat downwardly, extendingsurface, l8 and, an upwardly tapering surfaces 24!. The surface 24 is terminated a short distance before the periphery. of, the, centrally locatedorifice. 26 is reached, the undersurface of. plate 2 0,im.-- mediately, adjacent said orifice being. parallelto,

the upper surface 22. of th'e plate.

The base plate, 28,,bearing radiator. receptacles:

i6 andgroundedradiators i2 mounted therein, is

electrically and mechanicallyconnected to an an tenna supporting mast 26 by means of a metallic,-

coupling unit. 3!]- and three. metallic, U.-channel legs 32'.

The coupling unit 30 comprises a-cylindricalresilient coupler having a. longitudinal slotalong the lower end thereof; Positioned about thelongitudinally cut portion of. said'coupler 34 isa ring clamp 36 having the outwardly extending arms,

38 thereof apertured to receive a locking wing nutAil'.

The three legs 32 are connected between basev plate 2!! and the upper portion of thecoupler. 3.4.

The upper ends of. legs 32jarefixedtobase' platev 2a by screws 42and. are rivetedtocouplerBA.

The antenna mast Z8 is formed. or, an. electrically conductivematerial and is grounded, by Ice-- ing sunk in the earth or. by. being electrically C011.- nectedtoa grounded apparatus,

The sockets The head l4, bearing radiator elements In, is positioned above base plate 26 and is electrically insulated therefrom by means of

dielectric spacers

44 and 46.

Dielectric spacer 44 is provided with an upper outside diameter complementary to orifice 26 formed in plate 26 and is provided with a larger lower outside diameter to form a shoulder 48 to engage the undersurface of plate 26 about the periphery of the orifice. The portion of the dielectric spacer 44 that is defined by the upper outside diameter is slightly greater in length than the thickness of the plate 26 immediately about the periphery of the orifice 26.

The spacer 44 is provided with a square axial bore complementary to a square lock stop 56 formed on the inner conductor 52 of a coaxial cable connector 54. The spacer 44 is also provided with an annular axial recess formed in its lower surface complementary to the outside diameter of said coaxial cable connector.

The dielectric spacer 46 is generally cylindrical and is provided with an axial bore complementary to inner conductor 52 of coaxial cable connector 54. An annular recess is formed in the lower surface of spacer 46 complementary to the diameter of the upper portion of spacer 44. The spacer 46 is further provided with an annular axial recess formed in its upper surface, the said recess being slightly larger in diameter than the lower surface of head l4.

The coaxial cable connector 54 comprises an outer conductor 56 and an inner conductor 52 coaxial therewith, the said conductors being electrically insulated from each other by means of a dielectric cylinder 58 having an outwardly extending flange about its upper end. The cylinder 58 is pressed into the space between the inner and

outer conductors

52, 56 and serves both to electrically insulate the conductors from each other and also to rigidly position the conductors with respect to each other.

The outer conductor 56 is externally threaded to receive an electrically conducting ring 60. A flexible metal band 62 is connected between rin 66 and grounded base plate 26.

The portion of inner conductor 52 lying within outer conductor 56 is formed to provide a standard female terminal to mate with the stand ard male terminal customarily formed on the end of coaxial cable. The portion of inner conductor 52 immediately beyond the upper limit of the outer conductor 56 is substantially square in cross section. The remainder of inner conductor 52 is circular in cross section and is externally threaded to engage a threaded axial bore formed upwardly in head [4 from the lower surface thereof.

The inner conductor 52 serves both to electrically feed upper radiators l and to hold head l4 firmly in spaced relationship with plate 26.

Thus, to assemble the assembly mounting, spacer 44 is first inserted upwardly into orifice 26, The recess formed in the lower surface of spacer 46 is then fitted about that portion of spacer 44 extending above upper surface 22 of plate 20'. The inner conductor 52 of coaxial cable connector 54 is then passed upwardly through the axial bores of

spacers

44, 46, the square portion 50 of inner conductor 52 locking in the square axial bore formed in spacer 44. The head I4 is then threaded on the portion of the inner conductor 52 extending above the spacer 46 and the entire assembly is drawn tight,

In order to Waterproof the assembly, and also in order to shock mount the

dielectric spacers

44, 46, rubber washers are provided between each mating surface. A rubber washer 64, having an outside diameter equal to the diameter of the recess formed in the lower surface of spacer 44, and having a quare axial perforation complementary to the square portion 50 formed alon inner conductor 52 is seated in the said recess.

A rubber washer 66 is provided adapted to fit snugly against shoulder 48 of spacer 44. A rubber washer 68 is positioned about that portion of spacer 44 extending upwardly beyond surface 22, the outer diameter of said washer being greater than the outer diameter of spacer 46. A rubber washer 10 is positioned in the recess formed in the upper surface of spacer 46. A metal disc 12 having the same dimensions as rubber washer I0 is positioned immediately above the said washer in said recess, the purpose of said disc being to prevent shearing of washer 10 by head l4 as the assembly is drawn tight.

The antenna having thus been assembled, electrical connection is made to coaxial cable connector 52. The coupler 34 is then positioned about the upper portion of the antenna mast 28 and is tightened thereon by means of clamp 36 and wing lock nut 40. The antenna assembly is then in readiness to be raised and used.

As is well known, the optimum frequency at which a biconical antenna will operate is determined both by the angle of opening between the cones and by the electrical length and width of the cones. The biconical antenna disclosed herein is axially symmetrical and is provided with a fixed angle between cones, which angle, of course, may be varied throughout a series of antennas. The device disclosed herein, however, is adapted to receive radiating elements of varying lengths, since all of the radiating elements l0 and I2 are threadably connected to the assembly. Thus, if it is desired to operate on a plurality of frequencies at which radiation shall be transmitted or received, radiators of optimum length for each frequency may be chosen.

There has thus been disclosed a rigid, easily assembled, waterproof antenna that is designed to operate over a wide range of frequencies. It will be obvious that many modifications and changes may be made in the specific embodiment disclosed herein. For example, the head I4 may be provided with a single, axially extending, re-

placeable radiator to replace the three upwardly and outwardly extending radiators 10. It is therefore intended that the full scope of the invention be defined in the attached claims.

What is claimed is:

1. An axially symmetrical biconical assembly comprising a metallic head having at least three upwardly and outwardly extending sockets formed therein, a metallic, annular base plate bearing at least three downwardly and outwardly extending radiator sockets, said head sockets and said plate sockets forming the same angle with the axis of said assembly; a first, annular, dielectric spacer positioned between said head and said plate, a rubber washer positioned between said base plate and said first spacer, a second rubber washer and a metallic washer positioned between said spacer and said head; a resilient, metallic coupler, metallic legs to connect said coupler and said plate; a coaxial cable connector comprising an outer conductor and an elongated, externally threaded, inner conductor coaxial therewith, means to connect electrically said outer conductor to said base plate, and means to insulate said inner conductor from said base plate, said inner conductor extending upwardly through said washers, plate and spacers to engage mechanically and electrically said head.

2. An axially symmetrical biconical assembly comprising a metallic head having at least three upwardly and outwardly extending sockets formed therein, a metallic, annular base plate bearing at least three downwardly and outwardly extending radiator sockets, said head sockets and said plate sockets forming the same angle with the axis of said assembly, a first, annular, dielectric spacer positioned between said base plate and said first spacer, a second rubber washer and a metallic washer positioned between said spacer and said head; a resilient, metallic coupler, metallic legs to connect said coupler and said plate; a coaxial cable connector comprising an outer conductor and an elongated, externally threaded, inner conductor coaxial therewith; a flexible, metallic band to connect electrically said outer conductor to said plate; a second annular, dielectric spacer positioned between said outer conductor and said base plate, a portion of said second spacer extending axially through said plate, a rubber washer positioned between said spacer and said plate, a rubber Washer positioned between said REFERENCES CITED The following references are of record in the ille or this patent:

UNITED STATES PATENTS Number Name Date 1,852,146 Carns Apr. 5, 1932 2,151,102 Haukedahl Mar. 21, 1939 2,175,252 Carter (2) Oct. 10, 1939 2,175,254 Carter (3) Oct. 10, 1939 2,237,776 Carter (1) Apr. 8, 1941 2,243,136 Trevor May 27, 1941 2,401,601 Atwood June 4, 1946 2,403,479 Bryers July 9, 1946 2,411,976 Peterson Dec. 3, 1946