Reflection phase shifter and multiple bit phase shifter

Details Reflection phase shifter and multiple bit phase shifter Reflection phase shifter and multiple bit phase shifter

1993-11-08

1995-01-03

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

333164, H01P 118

Patent

active

053790073

ABSTRACT:
A reflection phase shifter includes a 3 dB directional coupler having opposite first and second ends, a reflection circuit connected between the first and second ends of the 3 dB directional coupler, a first resonant circuit connected between a node connecting the first end of the 3 dB directional coupler and the reflection circuit and ground, and a second resonant circuit connected between a node connecting the second end of the 3 dB directional coupler and the reflection circuit and ground. Each resonant circuit comprises an FET and an inductor connected between source and drain electrodes of the FET. In this reflection phase shifter, when the resonant circuits are open, the first and second ends of the 3 dB directional coupler are connected to the reflection circuit. On other hand, when the resonant circuits are short-circuited, the first and second ends of the 3 dB directional coupler are grounded. As a result, three different phases, i.e., two different phase shift quantities, are attained in one reflection phase shifter.

REFERENCES:
patent: 4612520 (1986-09-01), Boire et al.
patent: 4789846 (1988-12-01), Matsunaga et al.
patent: 4810911 (1989-03-01), Noguchi
patent: 5128639 (1992-07-01), Ueda et al.
Opp et al., "Design of Digital Loaded-Line Phase-Shift Networks for Microwave Thin-Film Applications," IEEE, 1968, pp. 180-186.
Boire et al., "4:1 Bandwidth Digital Five Bit MMIC Phase Shifters," IEEE, 1988, pp. 69-73.

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