Capacitively compensated microstrip directional coupler

Details Capacitively compensated microstrip directional coupler Capacitively compensated microstrip directional coupler

H - Electricity

01

P

H01P 5/18 (2006.01)

Patent

CA 2053897

2053897 9015451 PCTABScor01 A microstrip capacitively-compensated directional coupler (100) with improved directivity and decreased coupling length. The directional coupler (100) of the invention includes a primary transmission line (102), having a first port (126) and a second port (128) and a secondary transmission line (104) electromagnetically coupled to the first line. The secondary transmission line has a third port (130) and a fourth port (132). The invention also calls for a first reactive coupling network (138) disposed between the first port (126) and the third port (130), and a second reactive coupling network (140), disposed between the second port (128) and the fourth port (132). Those reactive couplings improve the directivity of the coupler (100) and foreshorten its coupling length. The invention also calls for a phase-shifting line (210) for shifting the phase of the coupled signal. The phase-shifting line (210) further foreshortens the required coupling length for the coupler.

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