研究目的
To present a type of bandpass filter (BPF)-integrated single-pole double-throw (SPDT) switch using common shorted stepped-impedance resonator technique, achieving low insertion losses, sharp skirts, high roll-off rate of sidebands, high OFF-state suppression (OSS), and high port-to-port isolation.
研究成果
One third-order BPF-integrated SPDT switch and one fourth-order BPF-integrated SPDT switch selectivity are presented in this paper. By series with switched 50-(cid:2) matching circuits on noncommon ports, the absorptive OFF-state property is also acquired. The proposed BPF-integrated SPDT switches exhibit low ILs, sharp passband selectivity, deep OSSs, high port-to-port isolations, and compact circuit sizes.
研究不足
The paper does not explicitly mention the limitations of the research.
1：Experimental Design and Method Selection:
The BPF-integrated ON-state with reverse-biased p-i-n diodes is synthesized by classical coupled-resonator filter design theory. The OFF-state with forward-biased p-i-n diodes is detuned to exhibit high OFF-state suppression (OSS).
2：Sample Selection and Data Sources:
The third-order/fourth-order BPF-integrated SPDT switches at center frequency f0 = 1 GHz with ripple bandwidth of 110/100 MHz are designed.
3：List of Experimental Equipment and Materials:
The circuits are designed and fabricated on the substrate Rogers RT/duroid 5880 (h = 0.508 mm, εre = 2.2, and tanδ = 0.0009).
4：508 mm, εre = 2, and tanδ = 0009).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The transmission zeros due to the direct coupled feed, the cross-couplings and the cancelling effect of mixed electric and magnetic coupling are produced to improve the ON-state passband selectivity significantly.
5：Data Analysis Methods:
The performance of the proposed BPF-integrated SPDT switches is optimized by co-simulation of HFSS software and ADS software.
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