US2003375A - Direction finding coil antenna - Google Patents

Description

June 4, 1955. v A. LEIB I 2,003,375

DIRECTION FINDING COIL ANTENNA i e pr l 930, 2 Sheets-Sheetv 1 mvENToR AUGUST LHB F wzww ATTORNEY June 4, 1935.

A. LEIB I 2,003,375

DIRECTION FINDING COIL ANTENNA Filed April 25, 1950 2 Sheets-Sheet 2 INVENTOR AUGUST LEIB Y ATTORNEY lists hei siB r fen n .ee n im- Bal or coil aerial, recourse is usually had to ,a non.-

directional auxiliary antenna for the purpose off.

determining the sense of direction of the incoming signals. However, theuse of the latter is liable to be attended with undesirable complications in thatthe same-acts'likea body reflecting the electromagnetic radiationsand this in'turn occasions a certain angular displacement or shift of the plane of the waves falling in the directional antenna.

It has beensuggested in the prior art to mount the auxiliary antenna inthe axis of rotation of the direction-finding frame antenna (see, for example, Keen, Wireless DirectionlFinding, secnd edition, page 113-, Fig. 106 and page 116, lines However, even in this 6 and from below). scheme mutual influences between the two antennae are not' entirely precluded inasmuch as then mutual electrostatic-actions occur on account of the proximity of the two antennae.

Now, according to this disclosure. perfect -cooperation of the direction-findingantenna and. the auxiliary antenna or'auxiliary antenna lead disposed in the axis of rotation thereof is made possibleby that for the purpose of insuringprotection from mutual influences, a grounded metal tube or'pipe, or some; similar metal protection :means, is providedb'etween the auxiliary antene na lead and the windings or leads of the directional antenna; r

In. case the direction-finding antenna is en closed withina weather-proof pipe, the latter could be used as the auxiliary antenna: or antenna lead. i Y

In order that also the lightning protection means may be arranged as symmetrically as feasible in relation to the directional antenna, it is" a particularly advantageous scheme to employ the said weather-proof pipe as one pole of the lightning protection device; The invention will be better understood by reference to the drawings throughout which like reference numerals indicate. like parts and in which,

Figure l shows a wiring diagram of the antenna arrangement according to this invention; Figure 2 showsin elevation, the weather-proof :frame aerial, the vertical aerial associatedtherewith, a static electricity protection device, the

. mountingfor the frame aerial, a receiver and the shield enclosing the leads from the frame aerial to the receiver; 1 v Figure" 2a. shows a cross section taken along the line A, B01?v Figure 2,662,375 fircrioer irmafl a NT l Ge rm ahy, assignor to Tele- T V aft fur Drahtlose Telegraphic ,j eermaey ai corporation of inseama al es a, saaim aem In rm ny' ne 8,2132 V 3 Claims. crest- 1 in direction-finding workby the aid of a frame ftectorjpipe of the directional-aerial.

Figure 2b showsa cross section taken along the lines C,'D of Figure 2;

Figure 3 shows in prospective an application of "the present invention; while,

Figure'3ct shows a modification of the arrangement shown in Figure 3. 7

Fig. l of the drawings shows a fundamental key diagram. of the arrangement according to this invention. Referring to the'drawings,;a de-" notes -the auxiliary antenna which is neutralized (uncoupled) in relation to the supply leads I, .2, 3, l, of the coil aerial by means of a grounded metalprotectionmeans E. The coil aerial consistsjfo r instanceof two coil windings RI and R2 which may be. connected in series or in parallel according to requirements Fig. 2 shows an elevation of the arrangement according to this invention in combination with a weather-proof direction-finding antenna, the weather-proof pipe of which at the same time device. 11 here denotes the weather-proof pro- The posi-. tion of the winding of the directional antenna in- 'sidesaidj protective pipe is shown by way of ex-- ample for the section AB inLFig. 2a.

0 denotes the shaft pipeassembled together with the frame ring a by means of a holding'clip. b. The position of the leads inside said shaft is shown,

for instance, Fig..2b for the section CD. The numerals l-6 here refer to the, key diagram Fig. 1. d is the coupler fork of the hand wheel secured upon the shaft by theraid of a clip. e denotes the drive of the directional aerial comprising hand-wheel and goniometer scale or dial.

f is a flexiblemetal protection means the cross:

serves as one pole of the lightning protection section of which'is the same as shown in Fig. 2a.; j

g is a coupler plug uniting all of the leads 1-43 shown in the keydiagram, i is the direction-finder receiver with which the direction finding or auxiliary antenna may-be connected by .insert- 7 ing the plug g in the receptacle bushes disposed in the plate 1'. 7c is the auxiliary-antenna lead. It may be identical with the auxiliary antenna A when the latter constitutes a simple linear structure (see Fig; 3), or else it may serve asthe lead brought to the auxiliary antenna consisting, for instance, of two diagonal wires Al, A2,

and being disposed in horizontal sense (Fig. 3).

Z is an auxiliary fixture for connecting the aux-.

iliary antenna and for clamping the insulator piece pofthe frame ring, m denotes the'connect- ,ing lead be'tween Z and the lead of the auxiliary antenna accommodated inside the pipe shaft '0.

are the lightning protection horns adapted to conduct a lightning stroke that has struck the antenna from the frame to earth.

As can be seen from Fig. 2b, the lead 5 of the auxiliary antenna is disposed inside a ground metal protector sheath 6 so that it is perfectly screened from the adjacent leads |4 of the directional antenna.

I claim: I 7,

1. In a directional aerial system the combination, of a frame aerial, a conducting closure member therefor, a vertical aerial supported by said closure member symmetrically with respect to said frame aerial, electrical disturbance pro- ,tective means cooperating with said vertical aerial and said closure member to protect said vertical aerial from electrical disturbances and a receiver adapted to be connected to said aerial system.

2. In a directional aerial system the combination, of a frame aerial, a conducting closure vertical aerial connection.

3. A direction'finding system including a rotatable frame aerial, shielding means therefor, a vertical aerial mounted on saidframe aerial, an electrical disturbancedissipating means mounted 'on'saidframe aerial adjacent said vertical aerial,

a receiver, means for connecting said frame aerial to said receiver, and a symmetrical conmotion between said vertical aerial and said receiver.

AUGUST LEIB.

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