Microstrip phase shifter provides improved match
Abstract
A technique is presented for designing a microstrip 90-degree phase shifter which achieves greater return loss by compensating for unequal mode velocities and end termination. It is reported that a phase shifter built according to the design equations presented for a 3-GHz center frequency has a return loss of only 15 dB at the center frequency, but the amount of phase shift is close to that predicted by theory. This return loss, or match, can be improved by compensating for the inequality of even- and odd-mode velocities. A technique examined relies on a stepped impedance meander line, in which the circuit compensates the return loss by purposely mismatching the two sections with uneven coupling.
- Publication:
-
Microwaves
- Pub Date:
- October 1979
- Bibcode:
- 1979MicWa..18...44H
- Keywords:
-
- Computer Aided Design;
- Impedance Matching;
- Microstrip Transmission Lines;
- Microwave Coupling;
- Phase Shift Circuits;
- Fortran;
- Frequency Response;
- Microwave Circuits;
- Propagation Modes;
- Propagation Velocity;
- Transmission Loss;
- Electronics and Electrical Engineering