Microstrip-slot coupler design. I - S-parameters of uncompensated and compensated couplers. II - Practical design aspects
Abstract
The considered microstrip-slot coupler is particularly suitable for the realization of 3-dB couplers in microwave integrated circuit (MIC) technology. This coupler was originally proposed by de Ronde (1970), and an empirical design was described by Garcia (1971). The present investigation is concerned with the derivation of the scattering parameters of the microstrip-slot coupler from the even- and odd-mode parameters of the coupling section. The analysis is extended to include a lengthening of the slot line, which is used to compensate for the different phase velocities of the even and odd modes. In order to supplement the theoretical analysis, several problems of practical microstrip-slot coupler design are studied. Emphasis is given to the realization of 3-dB couplers in MIC technology of Al2O3 ceramic substrate. The improvement of the coupler performance attainable through compensation is shown with the aid of a theoretical analysis.
- Publication:
-
IEEE Transactions on Microwave Theory Techniques
- Pub Date:
- August 1982
- DOI:
- 10.1109/TMTT.1982.1131222
- Bibcode:
- 1982ITMTT..30.1205H
- Keywords:
-
- Coupling Circuits;
- Integrated Circuits;
- Microstrip Transmission Lines;
- Microwave Coupling;
- Network Synthesis;
- Scattering Coefficients;
- Aluminum Oxides;
- Ceramics;
- Couplers;
- Phase Conjugation;
- Phase Velocity;
- Propagation Modes;
- Slots;
- Electronics and Electrical Engineering