Microwave modulator

Details Microwave modulator Microwave modulator

1990-02-22

1991-05-21

Mis, David

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375 67, H03C 702

Patent

active

050178938

ABSTRACT:
A waveguide modulation circuit branches a first short circuit from a main waveguide and branches a second short circuit from the first short circuit. The second short circuit is branched by an H-plane slit coupling at a position distant from the short-terminal of the first short circuit by a length of a half wavelength or some multiples thereof and this second short circuit is short-circuited or conductively terminated at a length of a half wavelength or some muliples thereof distant from its branch point. In the second short circuit, a switching diode is loaded at a predetermined position distant from the short-terminal towards the branch point. A pulse train of the modulation signal is appled to this diode to attain a 2-phase PSK-modulation circuit. A wave absorber may be attached to the short-terminal of the first short circuit, whenever necessary. A 4-phase PSK signal can also be obtained.

REFERENCES:
Yamamoto, H. et al., "20 GHz Band PIN Diode High-Speed Quadriphase Modulator" , Review of Electrical Communication Laboratories (Japan), vol. 25, No. 3-4, Mar.-Apr. 1977, pp. 343-352.
"Digital Microwave Communication" , M. Kuwabara, pp. 106-109, Published (in Japanese) May 25, 1984, Jan. 1988.

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