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This paper proposes a two-pole two-path mixed coupling tunable filter with a constant bandwidth. A novel frequency dependent I/O structure is presented to generate up to five adjustable transmission zeros (TZs) without increasing the order of the filter. Thus, the selectivity and the out-of-band rejection are enhanced simultaneously in a very compact size. With the coupling characteristic deeply analyzed,...
This letter proposes a two-path mixed coupling tunable bandpass filter with constant bandwidth. This compact configuration can achieve little bandwidth variation in a large tuning range. Presented with the equivalent circuit of the coupling structure, the analytical formulas of the two-path mixed coupling structure are derived to determine the initial dimensions of the resonator quickly. Furthermore,...
This paper presents a novel dual-mode tunable bandpass filter to significantly reduce the complexity for multiband communication. A mixed coupling scheme is utilized to analysis and design the dual mode tunable filter with source - load coupling. A simple approach is proposed to extract the parameters of varactor diode. For demonstration, a tunable filter is implemented with 73 MHz 3-dB bandwidth...
This paper presents the design of novel tunable bandpass filter with constant absolute bandwidth. A novel mixed electric and magnetic coupling scheme is utilized. Theoretical analysis indicates that it is able to achieve desired coupling coefficients between the proposed resonators. For demonstration, a high Q tunable filter is implemented with 105 MHz constant absolute bandwidth. Experimental results...
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