Compact dual-band bandpass filter using uniform-impedance resonators and dual-mode resonator

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• 作者：Jin Xu and Chuan-Ming Zhu
• 关键词：bandpass filter ; dual-band ; source-load coupling ; mixed electric and magnetic coupling
• 刊名：Microwave and Optical Technology Letters
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：58
• 期：7
• 页码：1537-1540
• 全文大小：590K
• ISSN：1098-2760

文摘

This article presents a compact dual-band bandpass filter (BPF) using a pair of one-end shorted uniform-impedance resonators (SUIRs) and a single dual-mode resonator (DMR). A pair of SUIRs with mixed electric and magnetic coupling (MEMC) not only realizes the lower passband but also serves as the feeding lines with source-load coupling to excite the DMR to produce the upper passband. Four transmission zeros due to the cancelling effect of MEMC, harmonic effect, source-load coupling, and inherent property of DMR improve the passband selectivity, band-to-band isolation, and out-of-band rejection. As an example, a dual-band BPF operating at 1.57/2.4 GHz with compact size of 0.1λ_g × 0.127λ_g is designed and fabricated. The simulation agrees very well with measurement.