US2534592A

US2534592A - Television antenna

Info

Publication number: US2534592A
Application number: US127921A
Authority: US
Inventors: Goumas James
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-11-17
Filing date: 1949-11-17
Publication date: 1950-12-19
Anticipated expiration: 1967-12-19

Description

.Filed Nbv. 17. 1949 1 v 2 Sheets-Sheet 1 Dec. 19, 1950 J. GOUMAS 2,534,52

TELEVISION ANTENNA INVENTOR cfame's aoumas ATTORNEYfi J. GOUMAS TELEVISION ANTENNA Dec. 19, 1950 Filed Nov. 17, 1949 2 Sheets-Sheet 2 INVENTOR James gouma 5 ATTORNEYS in its erection and maintenance.

Patented Dec. 19, 1950 UNITED STATES PATENT OFFICE 2,534,592 rrnLnvisioN ANTENNA James Goumas, Perth Amboy, N. J.

Application November 17, 1949, Serial No. 127,921

(01. 25o s3.s)

2 Claims. 1

My invention relates to antenna for radio reception and particularly an antenna system for use indoors with a television set utilizing a wide band of ultra-high frequency oscillations with performance throughout a large number of television channels.

One of the problems hindering the wide use of television is the difficulty experienced in securing satisfactory reception throughout the channels now being devoted to video programs due to lack of suflicient antennization. This problem is often due to the inability of the potential buyer of a television set to procure the permission of his landlord to erect the conventional outdoor type of antenna which is usually mounted on a roof, chimney or like elevated portion of a building. In other cases the buyer of the set may himself object to the appearance of such an antenna or the cost and danger involved Still other cases may arise where unusually severe conditions of reflected interference are present which interfere with reception throughout certain channels.

It is to be realized that the reception of a video signal to be adequate throughout a single channel must give-uniform coverage approximately 500 times the width of the signal of a normal broadcasting band. Therefore, in order to adequately receive over any one of the presently available television channels an antenna must be able to respond and discriminate over a plurality ,toovercome the difficulties of imperfect reproduction it has been considered prior to this time necessary to mount a large antenna system on the roof of the building in which the television set is to be used. These systems are not only expensive in first cost but are also expensive toinstall and maintain. Furthermore, they do not present a pleasing appearance especially so when a large number are erected on the roof of an apartment house for the tenants living therein.

It is therefore one of the objects of the present invention to provide an inexpensive antenna having spaced dipoles and angularly positioned Another object is to provide an antenna for indoor use that is capable of high gain performance.

Still another object is to provide an antenna having unusual reflecting characteristics.

A further object of the invention is to provide an indoor antenna system for unidirectional reception throughout the full upper and lower limits of the presently used television channels.

A still further object is to provide a dipole antenna having adjusting means indicative of the position of the dipoles relative to specific tele vision channels.

By this invention I obtained improved vide reception through the provision of relatively closely spaced folded dipoles to which additional capacitance is added by angularly placed dipole extensions disposed from angularly positioned reflecting rods adapted for installation within a building or like enclosure in close proximity to a television receivin set.

More particularly the invention consists of a novel construction andcombination of parts hereinafter described, illustrated in the drawings and pointed out in the appended claims; it being understood that various changes and variations in form, size, and materials may be resorted to without departing from the claims or sacrificing any of the advantages of the invention as illustrated in the drawings wherein like numbers refer to like parts in the various views.

In the drawings:

Figure 1 is a plan view of theantenna system of this invention.

Figure 2 is a side elevational view of the antenna.

Figure 3 is an end view showing the arrangement of the dipoles.

Figure 4 is a detail of the connections to "the dipoles.

Figure 5 is a sectional detail of the mount construction.

Figure 6 is a plan view of a modified form of mount provided with adjusting and indicating means. 7

Figure 7 is a partial section of the base taken on line '!'I of Figure 6.

Referring now in .detail to the drawings, in Figure 2 the antenna assemblange of this invention is shown generally at Ill. The antenna is mounted on a suitable base I I of sufficient weight to support the assemblage in an upright position but light enough to allow the assemblage to be readily moved as desired. The antenna is proportioned so that it can be either set on top of a teleplaced upwardly from the pad bolt ii.

vision cabinet or placed on the floor adjacent thereto as found to suit the individual preference of the user. I have found that a wood base makes a very satisfactory mount means, however, in those cases where a large quantity are to be produced a cast metal base as illustrated may be preferable. The base I l is preferably formed with a flat top portion l2 having an aperture l3 (Figure of sufficient size to receive a mount sleeve [4 having afiange i5 seated against the top portion. Flange l 5 is'secured to the top portion I2 against rotation by a screw IE or like securing means adapted for inserted engagement between the top portion and the flange. The flange l5is formed with a bore H into which an upright member l8 such as a pipe or round shaft is inserted. .The upright 13 is secured against axial .movement within the sleeve by collars ES placed in encircled engagement therewith above and below thefixed sleeve and secured to the upright by set screws :23] positioned transversely of theupright.

Seated across the top of the upright It is a crossbar 2i having a socket 22 spaced from the ends of the crossbar into which the top end 23 of the upright is inserted and fixedly secured thereto by screw means Although the socket .22 is shown as provided with a screw securing means 2t it is to be understood that in those in stances where demountability is not desired .a

.weld juncture means between the upright and "crossbar either ;with or without a socket can be used. Crossbar s1 is preferably of fiat strip construction to provide a flat top on which is mounted at each end thereof flat mount pads Dr insulators 24. Pads 2Q are substantially rec- =-tangular in shape and are formed of any suitable dielectric material of sufilcient thickness to stop-conduction of currents accumulated either in the reflectors and dipoles as hereinafter described and the crossbar 2!. The pads .24 are secured to the ends of the crossbarri by a suit- .able bolt means 25 inserted therethrough and .spaced from the edges of the pads toprovide planar insulated attaching areas-25.

- At one end of the crossbar 21 mounted on an insulator pad 2 are two pairs 2? and 28 of reflector rods-or radiators angularly disposed rel- -ative to eachother and the crossbar 2i as best illustrated in Figure 1. The pairs of rods 23 and 2.8 are preferably formed of metal tubing having

flattened ends

34 and 32 suitable for bolted attachment to the insulating pad on which they are seated. -The outer pair 2? is provided with direction so that their extended ends 33 are disposed upwardly of the crossbar 2|.

The two mounted ends 32 of rods 2% are electrically bonded together by an arched plate 34, or asuitable wire connector, having .a mid-section 3561s- The length, spacing and overall configuration of the two pairs of rods 21 and 23 is such as to provide screen means against undesired radiations and ialso-to actas reflecting means to radiate desired radiations toward the dipoles of the antenna mounted at the opposite end ofv the crossbar 21 as hereinafter described.

":of the low frequency channels.

.tensionsof the inner dipole 31 are a pair of an- Mounted on the other insulating pad 24 positioned at the other end of the crossbar 2i and spaced from the

reflector rods

21 and 28 are a pair of folded

dipoles

36 and 31. Both of the dipoles 36 and 3'! are preferably formed of metal tubing and of conventional looped construction spaced apart to provide for high and low frequency reception. The outer dipole 36 is of lesser overall dimensions to provide for less capacitanceadapted for reception of the high frequency channels with the inner dipole 3'! being of greater capacitance and adapted for reception Formed as exgularly disposed prong-like extension members .49 having; one end of each extension connected with the opposite ends 39 of the inner dipole. The extensions' lfl are provided with free ends 4| spaced apart and angularly disposed from the crossbar 2i.

The outer and inner dipoles S6 and 31 are respectively spaced apart with their opposite ends .33 and tiispaced apart and secured to the insulating pad .2 2 by suitable bolt means it. The respective ends 38 and 59 of the pair of dipoles are bonded together in parallel by separate bars 22 and 53 respectively as best illustrated in Figure 4. .A conventional twin lead television transmission line 54 is utilized as the set lead in with wires 55 and 45, of the line connected to bars 62 and 43 respectively and thence connected to the television set (not shown).

Figures 6 and T! show a modified lorm ofbase for the antenna assemblage lil wherein the base H is provided with a transverse adjusting shaft Mil mounted in the side thereof. Shaft M9 is provided with a driving gear means its positioned within the .base for engagement with a bevel gear 15.! carried by the rotatable upright iii-and secured thereto by a set screw 552. Shaft 148 is provided with knurled knob I53 positioned outside of the base H providing for ready manual rotation of shaft M9 to rotate the upright l8. Encircling the upright 13 and secured to the base ii is a round plate i55 having indicia indicative of channel positions beamed toward the situ of the antenna. Mounted on the up- :right Isis apointer E56 secured to the upright for rotation therewith by a set screw 57. The

purposeoi the pointeris to provide means of calibration of-the antenna assemblage wherein the pointer is correlated with the channel indicia in order that the best reception can be attained for each channel by merely rotating the antenna to a predetermined position. It is to be understood of course that calibration of the assemblage canbe readily accomplished as found necessary due to any relocation of the antenna to suitany particular set arrangement desired bythe .user. v.In this manner peak performance of a television set-throughout a large number of channels can be attained by merely turning the .knurled knob I53.

vI claim:

1. A television antennasystem having a portable supporting base, an upright rotatably mounted in the base with an .end vertically extended above the base, ahorizontal crossbar fixed to said extended and of the upright and formed with opposite ends spaced from said upright, insulator pads carried at each of said ends of the having an end secured to said pad the opposite end of each rod being angularly displaced relative to each other rod and the crossbar, one pair of said rods being positioned above said crossbar with said secured ends thereof bonded together and a second pair of rods having secured ends bonded together with free ends disposed substantially below the said crossbar, an inner folded dipole mounted on the insulator pad carried at the opposite end of the crossbar and spaced from said reflector, said inner dipole having spaced ends secured to said insulator pad and formed with prong-like extensions extending downwardly from each end thereof, said prong-like members having free ends angularly disposed relative to each other and the crossbar, an outer folded dipole spaced from the inner dipole having spaced ends secured to said insulator pad with said spaced ends positioned adjacent the spaced ends of the inner dipole, and transmission line connecting means connected between said adjacent ends of the spaced dipoles connecting said dipoles in parallel.

2. A television antenna system having a portable supporting base, an upright rotatably mounted in the base with an end vertically extended above the base, a horizontal crossbar fixed to said extended end of the upright and formed with opposite ends spaced from said upright, insulator pads carried at each of said ends of the crossbar, a reflector means mounted on one of said insulator pads carried by the crossbar, said reflector means being comprised of a plurality of radially extending rods with each of said rods having an end secured to said pad the opposite end of each rod being angularly displaced relative to each other rod and the crossbar, one pair of said rods being positioned above said crossbar with said secured ends thereof bonded together and a second pair of rods having secured ends bonded together with free ends disposed substantially below the said crossbar, an inner folded dipole mounted on the insulator pad carried at the opposite end of the crossbar and spaced from said reflector, said inner dipole having spaced ends secured to said insulator pad and formed with prong-like extensions extending downwardly from each end thereof, said prong-like members having free ends angularly disposed relative to each other and the crossbar, an outer folded dipole spaced from the inner dipole having spaced ends secured to said insulator pad with said spaced ends positioned adjacent the spaced ends of the inner dipole, transmission line connecting means connected between said adjacent ends of the spaced dipoles connecting said dipoles in parallel, and a rotator carried by the base in engagement with the upright for rotation of the antenna to different radial positions relative to the base.

JAMES GOUMAS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,394,026 Knoll Oct. 18, 1921 2,259,628 Fener Oct. 21, 1941 2,474,480 Kearse June 28, 1949 OTHER REFERENCES Tele-Tech, May 1948, page 52.