Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1995-01-24
1996-01-16
Gensler, Paul
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333262, H01P 115
Patent
active
054851300
ABSTRACT:
A microwave switch circuit includes a first impedance conversion circuit, one end of which is connected to an input terminal; a resonance circuit connected between an output of the first impedance conversion circuit and ground and including a parallel connection of a field effect transistor and a resonance inductor; and a second impedance conversion circuit connected between the output of the first impedance conversion circuit and an output terminal. One microwave switch circuit may be connected between an antenna terminal and a signal input terminal and another microwave switch circuit may be connected between the antenna terminal and a signal receiving terminal. The microwave switch circuit output terminal and input terminal may have an impedance of 50 .OMEGA. and the output of the first impedance conversion circuit may have an impedance lower than 50 .OMEGA.. The microwave switch circuit may include one-fourth wavelength transmission lines as the first and second impedance conversion circuits. Consequently, the maximum allowable value of the incident power is increased and withstand power is increased in an antenna switch circuit.
REFERENCES:
patent: 4637073 (1987-01-01), Selin et al.
patent: 4789846 (1988-12-01), Matsunaga et al.
Matsunaga et al, "High-Power Microwave Transmit-Receive Switch With Series And Shunt GaAs FETs", IEICE Trans. Electron., vol. E75-C, No. 2, Feb. 1992, pp. 252-258.
Matsunaga et al, "An X-Band 12W GaAs Monolithic Transmit-Receive Switch", The Transactions of the IEICE, vol. E70, No. 4, Apr. 1987, pp. 259-260.
Danny T. Bryant, "A Monolithic Reduced-Size Ku-Band SPDT Switch", IEEE MTT-S Digest, 1988, pp. 371-374.
Bernkopf et al, "A High Power K/Ka-Band Monolithic T/R Switch", IEEE 1991 Microwave and Millimeter-Wave Monolithic Circuits Symposium, pp. 15-18.
Pengelly et al, "Transmit-Receive Module Using GaAs ICs", Electrical Engineering, Nov. 1984, pp. 141-149.
Kashiwa Takuo
Nakahara Kazuhiko
Gensler Paul
Mitsubishi Denki & Kabushiki Kaisha
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