Abstract
A compact interdigital capacitor coupled dual-behavior resonator (DBR) fllter with high spurious responses suppression is proposed in this paper. The technique is based on two equivalent topologies of J-inverter and dual-line equivalent circuit of open- circuited stubs. The flrst compact equivalent topology capacitive inverter is a high pass structure, and consequently, the spurious responses can be suppressed efiectively at low frequencies. The second equivalent topology …-network is employed in realizing a compact size and adding new transmission zeros dedicated to the spurious responses suppression at high frequencies. Further compactness is achieved with a dual-line equivalent circuit of open-circuited stubs. The relevant equations are given in the paper. Finally, a 3rd-order compact DBR fllter is designed and measured. This structure has a high degree of miniaturization (83%) in comparison to the classical one. Measurement results show good agreement with the simulated ones.
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