Abstract-A novel dual-mode dual-band bandpass filter based on conventional triangular dual-mode filter is designed in this paper. The filter has the characteristics of compact structure, low insertion loss and so on. Based on the current design schemes, the design of dualmode and dual-band filter can be integrated in a novel filter structure. Several attenuation poles in the stopband are realized to improve the selectivity of the proposed bandpass filter. The experimented results were in good agreement with simulated results.

Abstract-A dual-mode dual-band bandpass microstrip filter using double square-loop structure is proposed in this paper. Each of the square-loop forms a dual-mode resonator with controllable respective passband. Two tuning patches placed symmetrically at the side of the perturbation patch are used to change the higher passband frequency, while while keeping the lower invariable. Several attenuation poles in the stopband are realized to improve the selectivity of the proposed bandpass filter. The filter is evaluated by experiment and simulation with good agreement.

A novel dual‐mode dual‐band bandpass filter using nested meander‐loop resonators is proposed in this article. The new filter structure is small and convenient to change the higher passband frequency. Several finite attenuation poles in stopbands are realized to improve the selectivity of the proposed bandpass filter. The filter is evaluated by experiment and simulation with very good agreement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 836–838, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23199

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