Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1989-06-02
1991-03-12
Gensler, Paul
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333116, H01P 518
Patent
active
049995936
ABSTRACT:
A microstrip capacitively-compensated directional coupler with improved directivity and decreased coupling length. The directional coupler of the invention includes a primary transmission line, having a first port and a second port and a secondary transmission line electromagnetically coupled to the first line. The secondary transmission line has a third port and a fourth port. The invention also calls for a first reactive coupling network disposed between the first port and the third port, and a second reactive coupling network disposed between the second port and the fourth port. Those reactive couplings improve the directivity of the coupler and foreshorten its coupling length. The invention also calls for a phase-shifting line for shifting the phase of the coupled signal. The phase-shifting line further foreshortens the required coupling length for the coupler.
REFERENCES:
patent: 3967220 (1976-06-01), Tagashira
patent: 4158184 (1979-06-01), Kenyon
patent: 4216446 (1980-08-01), Iwer
patent: 4482873 (1984-11-01), Nyhus
Buchenhorner Michael J.
Gensler Paul
Motorola Inc.
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