Microwave elements with impedance control circuits

Details Microwave elements with impedance control circuits Microwave elements with impedance control circuits

1990-03-22

1991-08-13

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307591, 307570, 307320, 333104, 333164, 330277, 328 55, 328155, H03K 500, H01P 110

Patent

active

050398733

ABSTRACT:
A microwave element includes an impedance control circuit for controlling the capacitance between the source and the drain of an FET in the off state including a series-connected diode and capacitor connected in parallel between the source and drain of the FET and a circuit for applying a variable bias voltage to the diode. A microwave switch including two FETs includes two impedance control circuits for controlling the capacitances of the FETs. A microwave switched line phase shifter includes two transmission lines of different electrical lengths and four FETs, two of the FETs being connected in series at each of the ends of the two transmission lines. Impedance control circuits for controlling the capacitances of each of the FETs are included. A microwave loaded-line phase shifter includes a main transmission line, two loaded lines having the same electrical length connected to the respective ends of the main line, and impedance control circuits for controlling the capacitances of FETs connected between the loaded lines and ground.

REFERENCES:
patent: 3882431 (1975-05-01), Hopwood et al.
patent: 4430630 (1984-02-01), Sakamoto
patent: 4789846 (1988-12-01), Matsunaga et al.
Matsunaga et al., "An X-Band 12W GaAs Monolithic Transmit-Receive Switch", IEICE, vol. E 70, No. 4, Apr., 1987.

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