USRE15041E - Akbtal condtictob fob wibeless telegbaphy - Google Patents

Description

C. S. FRANKLIN.

AERIAL CONDUCTOR FOR WIRELESS TELEGRAPHY,

' APPLICATION FILED JULY 23.1920.

Reissued Feb. 15, 1921. 15,041.

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AERIAL CONDUCTOR FOR WIRELESS TELEGRAPHY. APPLICATION FILED JULY 2-3, 1920.

Reissued Feb. 15, 1921. 15,041.

v 2 $HEET$$HEET @5137 e: Qui ter/we 1 Za% W an improved wireless aerial system which UNITED STATES PATENT OFFICE.

' CHARLES S. FRANKLIN, OF LONDON, ENGLAND, ASSIGNOR, BY MESN E ASSIGNMENTS,

TO RADIO CORPORATION OF AMERIGA, A CORPORATION OF DELAWARE.

AERIAL CONDUCTOR FOR WIRELESS TELEGRAPI-IY.

Specification of Reissued Letters Patent. Reissued F b. 15. 1921 Original Io.'1,322,101, dated-November 18, 1919, Srial No. 82,042, filed March 4, 1916. Application for reissue -fi1ed July 23, 1920. Serial No. 398,540.

DIVISION B.

To all whom it may concern:

Be it known that I, 'CHARLEs SAMUEL FRANKLIN, a subject of the King of Great Britain, residing air-Marconi House, Strand, London, England, have invented new and useful Improvements in or Connected with Aerial Conductors for Wireless Telegraphy, of which thefollowing is a specification.

This application is a division of my origlnal Patent No. 1,322,101.

The object of this invention is to provide shall be particularly suitable for a receiving station used-in conjunction with but separated from a transmitting station for duplex telegraphy.

It is known that an. aerial. system consist-v ing of two frames at right angles to each other, and used in conjunction with a radio goniom'eter, can receive best from anytwo opposite directions and eliminate signals from any two opposite directions at right angles to the first.

According to this invention. two similar directional aerial systems, each consisting of two vertical frames at right angles to one another, are erected at equal distances from an adjacent transmitting station and at a distance apart in the direction of motion of the wave being received which'is a considerable fraction of the wave length it is desired to receive. The moving coil .ofthe radio-goniometer connected to each directional aerial system is connected to a pair of wires leading to the receiving apparatus which is preferably arranged mid-way between them. Condensers are introduced into.

the circuits comprising the leading wires, the moving coils of the radio-goniometers, and the coils of the receiving apparatus in order to tune them to the desired wave.

The invention is illustrated by the accompanying diagrams, in which Figure 1 shows a preferred relation between the receiving station and the transmitting station; Fig. 2 shows the circuits which I may employ at a receiving station in accordance with one form of my invention; Fig. 3 shows circuits which I may employ at a receiving station, in accordance with another form of my invention, and Fig. 4 is a diagram tical frames at right angles to each other.

They are-situated at equal distances from an adjacent transmitting station B itvhich may have any type of transmitting aerial, and'the distance between them is a considerable-fraction .of the wave length it is desired to receive.

Presuming the station is arranged so that the direction of the received signals coincides with the line joining A, a, then the maximum receiving power of the combination is obtained when A andc are placed at a distance equal to one-half of the received wave length' It is, however, generally more useful to place them at a distance apart equal to one quarter of the received wave length.

Although it is advisable to arrange A, a, in the line of the desired communication, considerable variation from this can be allowed.

" In Fig. 2, C, c are two radio-goniometers the fixed coils of which are connected in the usual way to the aerial or antennae systems A, a respectively.

The moving coils 1), cl of the radio goniometers are connected through tuning condensers-E, e to coils F, f arranged to act upon a common 0011 G whlch is connected up to the receiving apparatus H through and a are a quarter wave length apart, then' waves comin in the line joining A and a will produce in the circuits connected to the radio-goniometers oscillations which are out of phase 90'degrees. If'these circuits have their respective capacities and inductances.

in phase.

In Fig. 3 I have illustrated a specific arrangement of the-goniometer and receiving apparatus particularly adapted for use in the manner just described. According to this arrangement there are two receivers H, h, the circuits of which include the cou-' pling coils G, g. The radi0-goniometer circuits include in addition to the coils D, cl

and the condensers E, 6 previously mentioned, the coupling coils F, f and f, F associated with the coils G and g, respectively. By merely crossing the Wires of each of the goniometer circuits as shown in this arrangement, I have accomplished the result that, when the radio-goniometer circuits are adjusted as above described, the oscillations in phase with each other in the two circuits oppose as regards one receiver and add as regards the other, waves coming from one direction will actuate only the one receiver and waves from the opposite direction will actuate only the other receiver.

It is therefore possible to receive from stations in opposite directions on the same wave-len h without mutual interference and at t e same time to transmit from an adiacent transmitting station.

t will be seen from the foregoing that, in the operation of my present invention,

the coils D, d are set at such an angle that they lie in the plane of the field caused by the waves from the adjacent transmitting apparatus B, thus eliminating interference from B, and the constants of the circuits of the coils D, d are set so that these circuits respond best to the same wave length, namely that of the station such as S from which it is desired to receive, but so that the phase angle between the current and electromotive force in one such circuit is advanced and the phase angle between the current and electromotive force in the other circuit is retarded sufliciently so that the total difference in phase between the currents in these two circuits, due to' both the readjustments just mentioned and t5 the geographical displacement between the antennae portions in the line of motion of the waves amounts to 180 degrees. The other coupling coils in the circuits of the coils D, cl, such as F, f (Fig. 2) or F, F f, f (Fig. 3) are then so arranged with respect to the coils G (Fig. 2) or G and g.(Fig. 3) that the currents inflcoils D, due to any given set of waves, such as those from S, or S, produce cumulative or additive effects on the coil G, or the coil 9 as the case given receiving circuit is concerned, and so tion lying between two sending stations from at least one of which it is desired to verse direction produce effects which oppose in the receiving coil or coils, thus neutralizmg or cancellng such waves so far as any 7 0 far as the system is concerned if only one receiving circuit is 1n use. v

It will be seen that my present invention comprises spaced antennae combined with means whereby the receiving system may discriminate between waves arriving from opposlte dlrections or in opposite sense,

along substantially the same line, while, by

combining the foregoin means with directive antennae, I am enab ed at the same time to prevent interference from a third transmitting station, such for instance as the ad- -jacent transmit-ting station B. I consider these results to be highly valuable and to be novel. While it is necessary according to this form of my invention that the two stations, such as S and S whose effects are balanced, be on opposite sides of the line from -B to the receiving station, they do not need to be inthe line A, a or in exact alinement through the receiving station, nor does the third station, such as B, require to be in a line at right angles to the line A, a.

What I claim is:

1. At a radio receiving station in combination a plurality of antenna system portions spaced apart an appreciable fraction of a wave length in the direction of motion of the signal wave to be received, said stareceive, a local circuit, and means associating said antennae portions with said circuit, and causing the system to discriminate between waves from said two stations.

2. At a radio receiving station, a plurality of antenna. system portions spaced apart an appreciable fraction of a wave length in line with the source of a desired signal and also in line with the source of an undesired signal, said receiving station being between said signal sources, a local circuit, means for producing in said circuit such phase relations that desired signals affecting said portions in desired succession are cumulatively 11 received, and undesired signals affecting them in reverse order are differentially received.

3. At a radio receiving station, a plurality of antenna system portions spaced apart an 2 appreciable fraction of a wave length in line with the source ofa desired signal andalso in line with the source of an undesired signal, field producing means associated wlth said alined portions, an'gularly adjust- I tance substantially one quarter of a wave 1 0- of said antennae to each of sai tions each of whlch is directive, said porlength in the direction of desired and interferln waves, means for shifting the phases of e cots produced by undesired signals, means for opposing said effects, and means for utilizing the desired waves.

5. A radio signaling system comprising a receiving station having two directive-antennae spaced apart a material fraction of a wave length in the direction of desired reception, and two distant transmitting stations in the line of said antennae, said receiving station including two receiving circuits and two circuits each cou ling each receiving circuits, said coupling circuits having currents therein due to a given signal 180 degrees apart and each coupled to the receiving circuits cumulatively asto waves from one of said distant stations and in opposition as to waves from another of said distant stations.

6. At a radio receiving station, in combination,'a pluralit of antenna system p0rtions being spaced apart an appreciable fraction of a wave length in the direction of ,motion of the signal wave to be received, said station, lying between two sending stations from at least one of which it is desired to receive, a third transmitting station out of 'alinement With said two, a local circuit, and means associating said antenna portions with said circuit causing the system to discriminate between waves from said two stations, and means associated with said means for preventing interference fromsaid third station.

7. At a radio receiving station, separated antenna system portions located to receive desired signals in said portions in one order of succession, and an undesired signal in the reverse order of succession, receiving means and means associated therewith and-with the said portions for causing eifects received in desired order to be retained and those in an undesired order to be canceled.

c. s. FRANKLIN.

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