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Microstrip broadband filters based on the multimode resonator, having conductors in the shape of an irregular meander are investigated. The increase of the periods of the meander electromagnetically connected with several single-mode resonators allow considerably to improve frequency selective properties of filters.
The properties of microstrip structure with the regular resonators and based on 2-D photonic crystal with dimension 2??3 are investigated theoretically and experimentally. An opportunity to create filters with high frequency selective characteristics and based on 2-D microwave design is demonstrated.
Microstrip band-pass filters based on the multimode resonator, having conductors in the shape of a rectangular ring are investigated. Such devices because of the high steepness of slopes of a passband and an extended high-frequency stopband can have high frequency selective properties.