US1588047A - Circuit arrangement for wireless signaling - Google Patents

Description

June 8 1926 1,588,047

M. OSNOS CIRCUIT ARRANGEMENT FOR WIRELESS SIGNALING Filed Feb. 122, 192:5

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.elrde to ter maths. upp .ha r ecn i s in, the, anteii ia'wavesfoffs pecia t ixi ia frc-ilic i'o e; eeuconilect tl'i e. a enna circu t,

ail. a-e ite; easses -I s: t re tes fre ue ts '011 of hose prior arrangement fQffiltQ I- ing ion-t the- .1 trap" ci'rcuit'connected across the secondary l of the high frequency transformer used to couple the antenna to its high frequency energizing source. This trap circuit consists of a condenser and an inductance in parallel and the values of the capacityv and induce 15 tance are so chosen that the circuit will resonate the frequency of the antenna circuit while the condenser will ofier only a slight resistance to the passage of the harmonic frequencies. The harmonic frequencies are thus by-passed from the antenna circuit, per iiiittiiig the latter to'be energized by substantially pure waves of its operating frequency. If there were no losses in the con% denser and inductance of the trap circuit a wattless current of the operating frequency would flow in it, whose presence would occasion no energ Y losses in the system. Theoretically, then, this arrangement would pro vide an efficient means for obtaining a pure 30' transmitter wave.

Another arrangement which has been used "for this purpose consists of intermediate circuits coupled between-the antenna and its high frequency energizing source.

These intermediate circuits are connected to the antenna by coupling coils or air core transformers and, in view'of the fact that the favorable coupling conditions are differ- 'WVit-h this arrangement the advantages of both the former systems are obtained with- The 'inter cut for the operating waves and for the 40 higher frequency wave's or harmonics transversing the primary winding of the trans former, on the antenna circuit will be materially'reduced ascompared to the efiect of the operating waves. 5

However, the above described arrangements have also considerable drawbacks. In the first-mentioned arrangement, the auxiliary circuit represents a source of small but material losses because, due to its being tuned to resonance with the operating frequency, the auxiliary circuit is traversed by considerable currents of this frequency which cause correspondingly large treaty? a s, on h an t harmonics consists ofaa higher frequencies.

waves of higher frequencies, the effect of the nsi e ed s Wat s er site.

On the other-hand, in th'eIsecoi dj named arrangement, the reaction of the higher frelosses'iin' the choke coil and can no more be sl1 red ed; i en rely el minated becaus the primary wind plif we tra sform the higher frequency' waves.

In accordance with the present invention, the above-mentioned drawbacks are eliminated by using a combination of the twosyssic trave sed by tems in which an intermediate circuit is used for coupling the source of energy to the antenna and in which the primary of the air core transformer, coupling the source to the antenna, is shunted by a condenser serving to form a tuned circuit and The invention may be more clearly understood from the following description which should be read in connection with the accompanying drawing, in which the single figure shows a diagrammatic circuit arrangement conforming to the invention. 1

Referring to. the figure, a generator g serves to energize an antenna A, the generator being coupled to an intermediate circuit by means of the transformer t, a condenser 0 being interposed in the generator out the disadvantages of either. mediate circuit serves to prevent short circuits and owing to the difierent coupling conditions for the operating waves and the higher frequencies, the effect of the latter on the antenna are materially reduced. The

condenserk further decreases the effects of thehigher frequencies on the antenna as it serves as a by-pass for them. The resonant circuit lcZ is not a source'of appreciable losses because the heavy currents circulating Y therein at the operating frequency are used for energizing the antenna circuit. This, moreover, avoids the necessity of providing s 0f he bsto by-pass the a special air core transformer for coupling to the antenna circuit.

It Will be obvious that the invention is adapted to other modifications, which Will readily occur to those skilled in the art; for example, only a part of the 'inductances Z and Z, may be used for coupling to the antenna circuit. a The showing, therefore, should be taken in exemplary and not in a limiting sense, as I intend to be limited only as indicated by the scope of the following claims.

Having described my invention, What I claim is:

V 1. An arrangement for high frequency signaling comprising a source of high fre quency energy, an oscillatory circuit coupled thereto comprising an inductance having a condenser connected directly across its terminals and a transmitting circuit coupled to sald inductance, said inductance and capacity being so adjusted that the oscilla-.

tory circuit Will resonate the transmitted frequency and the condenser Will b y-pass substantially all the undesirable higher frequencies. g r I I s V 2. An arrangement for high frequency signaling comprising a source of high frequency energy, an oscillatory circult coupled thereto consisting of a condenser and inductance in parallel and a transmitting circuit coupled to said'inductance, said in-'

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