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Design of Dual-Band Microstrip Rat Race Coupler with Circuit Miniaturization
2007
IEEE MTT-S International Microwave Symposium Digest
Preserved Fulltext
Rat race ring coupler with stepped-impedance sections is designed to have a dual-band characteristic. This is realized by attaching open stubs to both ends of each steppedimpedance section to create a phase of 900 at two designated frequencies. Transcendental equations are derived for solving impedance ratio R and lengths of the stepped-impedance sections. Circuit with miniaturized area can be obtained if R > 1 is chosen. Such microstrip ring hybrids operating at 2.45/5.2 GHz with R = 1 and R =
doi:10.1109/mwsym.2007.380319
fatcat:spjva6n7qrcupd76tk2qw5e33a