US1829419A - Frequency multiplication - Google Patents

Description

Oct. 27, 1931. os os 1,829,419

FREQUENCY MULTIPLICATION Filed Sept. 21, 1926 INVENTOR ENDEL OSNOS BY Z $4} A ORNEY Patented Oct. 27, 1931 UNITED STATES PATENT OFFICE MENDEL OSNOS, OF BERLIN, GERMANY, ASSIGNOB TO GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE M. B. H., OF BERLIN, GERMANY, A CORPORATION OF GERMANY FREQUENCY MULTIPLICATION Application filed September 21, 1926, Serial No. 136,770, and in Germany October 20, 1925.

The purpose of this invention is to provide an arrangement adapted to frequency multiplication in one stage by means of static frequency changers.

It is Well known that in fequency multiplication by the use of static frequency changers, the frequency can be raised by way of one or several intermediate frequencies to the desired multiple amount. From the fundamental Wave a convenientintermediate fre quency is derived, and from the latter in turn a higher frequency may be obtained in one and the same frequency changer. This has been disclosed in German Patent #391,287. To obtain and amplify the requisite intermediate frequencies separate circuits are used connected in parallel to the frequency changer, and each of these constitutes a capacitive short-circuit for the corresponding intermediate frequency.

Now, the present invention relates to a still simpler circuit arrangement in which the same circuit ahead of the antenna which serves to transfer the energy from the frequency changer to the antenna, also is made to act as a capacitive short-circuit for the intermediate frequency.

One embodiment of the invention is shown in the accompanyin drawing which illustrates a case where an Epstein-Joly frequency changer with direct current magnetization is employed. The Epstein-Joly transformer is differentially excited by direct current winding 9. A high frequency alternator M feeds the primary winding pp through an adjustable parallel resonant circuit C L and the tuning elements C L The secondary winding of the transformer 83 is likewise differentially arranged, and feeds through suitable tuning means (3 L: and the coupling coil L the antenna A with an even multiple fre quency, say, for instance, of quadruple value. The circuit 88 C L L feeding the antenna, according to my invention, is so proportioned that by itseilf it constitutes a capacitive short-circuit for the double frequency, while conj ointly with the antenna, it is tuned to the transmission frequency, for instance, the frequency of quadruple value. In this manner the wave of double frequency obtained by virtue of the capacitive short-circuit tends to favor a more marked development of the quadruple frequency for transmission.

In connection with this arrangement when used for quadruple frequency, it is a good plan to suppress the development of the triple harmonic by tuning the parallel resonant circuit L C to the triple frequency, thereby causing it to block that frequency.

I claim:

1. In combination, a direct current magnetized generator of harmonics, a source of energy at a fundamental frequency connected thereto thru a circuit tuned to the fundamental frequency, an output circuit coupled thereto tuned to a harmonic of the foundamental, and a utilization circuit coupled to the output circuit and tuned in combination with said coupling circuit to a harmonic of the aforesaid harmonic of the fundamental.

2. The combination specified in claim 1 having in addition a parallel resonant circuit tuned to an undesired frequency and located in one of the tuned circuits.

3. The combination with a frequency changer comprising a generator of harmonics and an output circuit tuned to an intermediate frequency and so proportioned that it is capacitive in reactance for a certain other frequency, of a utilization circuit coupled to the output circuit and tuned conjointly with it to a utilization frequency.

4:. Frequency changing means comprising an input circuit tuned to a fundamental frequency and containing a parallel resonant circuit turned to an undesired harmonic, a harmonic generator, an output circuit tuned to a desired intermediate harmonic frequency and coupled to said harmonic generator, and a utilization circuit so coupled to said output circuit that said output circuit is also resonant to a harmonic of the intermediate frequency.

5. In combination a one stage frequency multiplying circuit, a load circuit, and a transferring circuit therebetween, tuning elements in said transferring circuit and means controlled thereby for so electrically proportioning said transferring circuit that for certain frequencies it constitutes in itself a capacitive short circuit and together with said load circuit it has zero reactance for a certain other frequency.

6. In combination a one stage static frequency multiplier including a fundamental frequency producer, aload circuit, and an intermediate circuit coupling said load circuit to said frequency multiplier, means for tuning said load circuit to a harmonic frequency, said intermediate circuit constituting a path in which current at a frequency intermediate the frequency of the load circuit and the fundamental frequency of the multiplier leads the voltage.

7. In an arrangement for frequency multiplication by means of a static frequency changer, a fundamental fequency generator in series with a circuit tuned to the fundamental frequency, a harmonic generator coupled to said circuit, a load circuit, a transfer circuit coupled on the one hand to said load circuit and on the other hand to said fundamental frequency generator ircuit and said harmonic frequency generator, means for determining the electrical characteristics of said transfer circuit such that it constitutes a path for a frequency intermediate the fundamental frequency and the load frequency such that current set up by said intermediate frequency leads the voltage, and means for tuning said transfer circuit conjointly with said load circuit to a harmonic of the foundamental frequency.

8. In apparatus for producing high frequency oscillations, a fundamental frequency generator, a circuit therefor tuned to the fundamental frequency, a direct current magnetized harmonic generator coupled to said circuit, a load circuit, a transfer circuit coupling said load circuit to said first named circuit, means for tuning said load circuit conjointingly with said transfer circuit to an even harmonic of said fundamental frequency, and means for determining the electrical characteristics of said transfer circuitsuch that said circuit constitutes a path in which the current produced by the voltage oscillations at the harmonic frequency leads the inducing voltage.

MENDEL OSNOS.

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