Broadband power combiner

Details Broadband power combiner Broadband power combiner

1985-08-16

1986-04-15

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Significant distributed parameter resonator

331 96, 331 56, H03B 500

Patent

active

045830584

ABSTRACT:
A power combiner circuit for combining a plurality of signals to provide output power to a load over a broad range of operating frequencies includes a resonant cavity and a plurality of negative resistance diodes which couple such signals into the resonant cavity. Each one of the negative resistance diodes is disposed in a corresponding one of a like plurality of coaxial oscillators. In a first embodiment of the invention, the end of the cavity coupled to the load includes a plurality of members which provide a plurality of resonant structures and which are used to reduce variations in the impedance of the cavity over the operating range of frequency. In a second embodiment of the invention, each one of the coaxial oscillators includes a plurality of ring members used to match the impedance of the diode to that of the cavity and to reduce variations in the impedance of the cavity over the operating range of frequency. Since the impedance of the negative resistance diodes is a relatively slow changing function of frequency, reducing variations of the cavity impedance as a function of frequency provides a requisite impedance match between the diodes and the cavity over a broad range of operating frequency and, hence, provides high output power over such range of operating frequency.

REFERENCES:
patent: 3628171 (1971-12-01), Kurokawa et al.
patent: 3739298 (1973-06-01), Kawakami
patent: 4097821 (1978-06-01), Lampen et al.
patent: 4172240 (1979-10-01), Jerinic
"Prototypes for Use in Broadbanding Reflection Amplifiers," W. J. Getsinger; IEEE Transactions on Microwave Theory and Techniques; Nov. 1963; pp. 436-497.
"A Device Characterization and Circuit Design Procedure for Realizing High-Power Millimeter-Wave IMPATT-Diode Amplifiers" by Dean F. Peterson, IEEE Transactions on Microwave Theory and Techniques, vol. MTT-21, No. 11, Nov. 1973, pp. 681-689.
"30/20 GHz Spacecraft Impatt Solid State Transmitter", Technical Proposal, Apr. 4, 1980, for NASA, RFP No. 3-188665-Q, by TRW Defense and Space Systems Group, Redondo Beach, Calif., pp. 3-16 to 3-31.
K. Kurokawa, "The Single Cavity Multiple Device Oscillator", IEEE Trans., 1971, MTT vol. 19, No. 10, pp. 793-801.
Y. C. Ngan, "Two Diode Power Combining Near 140 GHz", Electronics Letters, 1979, vol. 15, No. 13, pp. 376, 377.

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