Non-commensurate line length rf modulator

Details Non-commensurate line length rf modulator Non-commensurate line length rf modulator

1989-09-29

1990-09-04

Mis, David

Modulators

Amplitude modulator

Including microwave or distributed parameter structure

332174, H03C 162

Patent

active

049547917

ABSTRACT:
In a reflective shunt-diode radio-frequency modulator the shunting diodes are spaces so that the transmission line sections between diode pairs have non-commensurate lengths. The transmission line length sections between diode pairs are selected so that a minimum in the frequency/attenuation curve resulting from one transmission line section/diode pair is cancelled by a maximum in the frequency/attenuation curve from another transmission line section/diode pair. The superposition of the frequency characteristics from all transmission line section/diode pairs results in a structure in which reactive cancellation occurs over the entire operating frequency range. Consequently, it is not necessary to saturate the shunting diodes at the low band end to maintain maximum attenuation. In addition, to improve insertion loss, capacitive stubs are located along the transmission line which modify the filter characteristics when the shunting diodes are turned "off".

REFERENCES:
patent: 4438415 (1984-03-01), Hopfer

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