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Source-load coupling is inserted to a compact filtering branch-line coupler for generating transmission zeros. Quarter-wavelength stepped-impedance resonators are employed as the resonating elements for circuit miniaturization. All inter-resonator couplings are of inductive type, and the source-load coupling between adjacent feeds is of capacitive type. Proper source-load coupling is extracted for...
A compact filtering branch-line coupler is developed with short-ended half-wave resonators. For input/ output matching, tapped-line feeds incorporate a skew-symmetric configuration with magnetic inter-resonator coupling, so that transmission zeros can be created on high side of the passbands in the coupled and through outputs, as well as the isolated port. Circuit analysis is conducted based on the...
A new compact filtering rat-race coupler is implemented by a 2×2 cross coupled configuration based on compact miniaturized hairpin resonators. Passband responses with transmission zeros are synthesized by an (n+4)×(n+4) coupling matrix. The zeros are created in the output ports by adding source-load coupling and their analytical expressions are derived. An experimental circuit is fabricated and measured...
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