US1994237A - Directional aerial - Google Patents

Description

. DIRECTIONAL AERIAL Filed Dec. 3, 1930 INVENTOR FRED WOODS ATTORNEY Patented Mar. 12, 1935 '5 s PATENT OFFICE 1,9943% k DIRECTIONAL AERm Fred Woods, Richmond, Surrey, England, assignor to Radio Corporation of America, a corporation of Delaware UNITED STATE.

Application December 3, 1930,-Seri al No. 499,619

111 Great Britain December 12, 1929 "8 Claims. (01. 250-33 This invention relates to directional aerial sys windings are similarly brought down inside the temsand, although not limited to its application pedestal. v thereto, is 'particularly suitable for use in con- When it is desired to take directional readings, nection with direction finding installations on the connection point for the screen system is left board ship. earthed or insulated, i.'e., unconnected, and the 5 Asis well known, it is common practice in direcaerials are utilized in the usual way.. When it tion finding installations toprovide a directional is desired to take sense readings the connection aerial system for ascertaining the direction of a point for the screen system is connected to earth received signal and an additional open aerial for through anappropriate phasing circuit by any ascertaining the sense of that direction. In convenient form of switch gear.

many-places, for example, on board ship,' the Preferably the frame aerials, pedestal, leads, additional open aerial'constitutes' an'undesirable and associated amplifier are provided with concomplication since it occupies valuable room and 1711111011 Screening Such Screening is y y is sometimes difiicult to install satisfactorily. to efiect in the described construction, for ex -Accordingto this invention, a directional aerial ample, as shown in Figure 2, by taking the leads 15;

system comprises directional frame aerial windat the base. of the pedestal through a hole 15 in ings for ascertaining thedirectionof a received the side thereof, and through a screening tube 16 signal and means cons'tituted by a screen'or to. the usual. screened amplifier v1'7, the tube, screens about said directional frame aerial windamplifier screen and pedestal being thus con- 20 ings for ascertaining the sense of said directinuous and totally enclosing the electrical cir- 20 tion. cuits and connections. The invention is illustrated in the accompany- It is found. that with such continuity of screening schematic drawing in which Figure 1 shows ing comparative immunity m' nduction and one general arrangement in accordance with this other. electrical noises is obtained since with the invention, while Figure 2 shows apreferred detail describedarrangement all points of the screening 25 modification suitable for incorporation at the y e are ma ai ed a SubStant aHy-the'same base f the pedestal. which forms rt of th appaelectrical level; It is not in practice necessary to ratus shown in Figure 1, earth the screens though, of course, this may in Referring to Figure 1, this shows a form of some cases be desirable if convenient. Again construction as applied to a so-called Belliniwith such screens it is not in practice necessary Tosi frame aerial system suitable for use on ship t at t p d s should be mounted upo insulaboard. Apparatus comprises a hollow pedestal tion though again this may be found desirable 1 mounted upon insulating material 2 and carryif convenient. i ing on the top a directional aerial system con- Having now particularlyxdescribed and ascersisting of a pair-of mutually perpendicular coils tained the nature of my said invention and in 3, 4, as usually provided in the well known what manner the same'is to be performed, I de- Bellini-Tosi system. The mutually perpendicuclare that what I claim is:- lar coils are enclosed within and screened by u Signal absorption yst inc udmetal and preferably weatherproof tubes 5, 6 of ing means for insuring t the energy a sorbed 40 usual construction which are connected together thereby Wi l b truly Characteristic of the y at the top where they cross and are ins lated tems position relative to the source of said sigfrom one another at the bottom where they cross. 1181s Comprising, tW0 Closed windings Of a D The top junction point of the tubular screens is rality of turns, a Screen Comprising metallic constituted by a suitable boxlike structure 7 tubes arranged at right angles t a h the COmwhichserves to provide mechanical support for the p et ly enclosing each of Said windings, Seldscreens, said boxlike structure carrying a downtallic tubes completely electrostatically shielding wardly projecting rod 8 which terminates at its said windings and substantially completely end in a similar boxlike structure'9 which supp y y enclosing Said Wind-ings, Said w g which they are insulated from one another. The rotatably mounting said screen on an insulated rod is connected down through the pedestal to a base, means for connecting said closed windings connection point 10 which thus constitutes eleC- to a receiving set, and means for obtaining a vertrically the connection pointof the screen system. tical aerial effect comprising a central metallic 55 The leads .1 2, 1 1 from h di i fin ing rod forming a lead symmetrically connected to 55 ports the coil screens at their lower crossing at being open to magnetic lines of force, means for .i said screen and symmetrically arranged with respect to said first named leads.

2. A directional aerial system comprising two directional loop aerials enclosed within metallic tubes, said tubes mounted upon a hollow metallic pedestal, both tubes and pedestal comprising an electrical shieldfor said directional aerial system, said loop aerials arranged at right angles to each other, the lower portion of said loop 'aerial .being supported on said hollow metallic pedestal by a box-like insulating member, and an upper metallic box-like member providing a junction point for said loop aerials, said upper k V atright angles to each other, the lower portion- "of said loop aerials being supported on said holmember having a depending metallic rod; said rod being mechanically secure but electrically insulated from said lower insulating member.

3. A directional aerial system' comprising (a pair of crossed frame closed aerial windings,

shielding means for said windings comprising,

metallic tubes electrically and mechanically conne'cted together-atone crossing-point and electrically insulated but mechanically secured together at'the' other o'rossin'glpoint, means for connecting said windings to a receiver, and a metal rod passing diametrically across the frame closed aerials'and between the two crossing points 'thereof,said 'metal'rod being mechanically secured but electrically insulated from the last mentioned crossing point so as'to act as a lead for said shielding means. v I 4. A directional aerial system comprising two directive loop 'aerials arranged at right angles to each other and enclosed within metallic tubes, said tubes being mounted on a hollow metallic pedestal, both tubes and said pedestal comprising an electrical shield for said directional aerial system, 'an' amplifier for said system, a plurality of connectingleads for connecting said loops and the amplifier passing through said pedestal,

means for providing a vertical aerial 'efiect for said system, comprising a central. lead electrically connected to the top of said loops and mechanicallyxsec'ured but electrically'insulated at the bottom of said loops and passing through said pedestal and symmetrically disposed with respect. to the first mentioned leads so as to provide the vertical aerial efiectfor said directional system; l

'5. A directional aerial system comprising two directional loop aerialsarranged atright angles to each other and enclosed within metallic tubes, said vtubesmounted upon a.- hollo.w metallic pedestal, one of said loops being alarger. diameter than the other, both tubes and pedestal comprising an electrical shield for said directional aerial system, the lower portion of said loop aerial being supported on said hollow metallic pedestal by a box-like insulating member, and an upper metallic box-like member providing a junction point for said loop aerials, said upper member having a depending metallic rod, said rod being mechanically secure but electrically insulated from said lower insulating member. V 5 6. A directional aerial system comprising two directional loop aerials enclosedwithin metallic tubes, said tubes being mounted upon aj hollow metallic pedestalfboth tubes and'pedestal com prising an electrical shield for said directional aerial system, a plurality of connecting leads for connecting said loops with a receiver and passing through said pedestaLsaid loop aerials arranged member, and an upper'metallic box-like member providing a junction point for said loop aerials, said upper member having a depending metallic rod, said rod being mechanically secure but electrically' insulated from said lower insulating member and passing through a central portion of saidpedestal so, as, to besymmetricallyidis posed withrespect to said first.mentioned-leadsa' to provide a vertical aerial effect'to saidid'irece'z" tional aerial system. 7 I v i 7. A directional aerialsystem. comprisingqaj" j pair of crossed frame closed aerialg-windings; mountedupon a hollow metallic ,pedestaLlshieldi- 3 ing means for said windings comprisingmetallici tubes electrically and mechanically connectedgto gether atone crossing pointand electrically in-;

sulated but mechanically secured together at the other crossing point, a plurality of connecting; f 35-; 1,

leads for connecting'said, loops with a ,receiver passing through thelower portion, of said pedes-j tal and a central lead electrically connected to}; the upper crossing point of s'aid'loops and me? chanically secured but electrically insulated; 4

pedestal, both tubes and said pedestal comprising l.

anelectrical shield for said directional aerialsysterm, a central lead electrically connected attire; top of said loops and mechanically secured. butelectrically insulated at the bottom 01 fi lid loops V and passing through the center portion of said pedestal seas to-provide a lead for the said elec' trical signal. 1

FRED woonsf

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