Optimum design of 3-dB branch-line couplers using microstrip lines
Abstract
A computer-aided design is described that makes it possible to reduce the internal impedance levels of branch-line couplers so that they may be physically constructed by microstrip lines, where the Fletcher-Powell search method has been used to optimize the design. Because microstrip lines are severely restricted in their usable impedance range, the 3-dB couplers presented here should be useful for numerous balanced-type components such as balanced mixers. The validity of the design has been experimentally verified in the microwave and millimeter-wave region.
- Publication:
-
IEEE Transactions on Microwave Theory Techniques
- Pub Date:
- August 1983
- DOI:
- 10.1109/TMTT.1983.1131568
- Bibcode:
- 1983ITMTT..31..674M
- Keywords:
-
- Computer Aided Design;
- Couplers;
- Electrical Impedance;
- Microstrip Transmission Lines;
- Network Synthesis;
- Frequency Response;
- Integrated Circuits;
- Microwave Coupling;
- Optimization;
- Electronics and Electrical Engineering