Novel patch-via-spiral resonators for the development of miniaturized bandpass filters with transmission zeros
Resource
IEEE Transactions on Microwave Theory and Techniques 55 (1): 137-146
Journal
IEEE Transactions on Microwave Theory and Techniques
Pages
137-146
Date Issued
2007
Date
2007
Author(s)
Lin, Shih-Cheng
Wang, Chi-Hsueh
Chen, Chun Hsiung
Abstract
A novel patch-via-spiral resonator based on the dual-metal-plane configuration is proposed and examined. With the microstrip patch on the top plane serving as a capacitor and linking to the quasi-lumped spiral inductor on the bottom plane through a connecting via, the proposed dual-plane resonator structure located on the opposite sides of the single substrate may form a miniaturized one in the printed-circuit board fabrication. By suitably combining the proposed patch-via-spiral resonators, useful coupled-resonator pairs may be constructed to simultaneously provide electric and magnetic couplings. Based on these coupled-resonator pairs, a second-order bandpass filter with multiple transmission zeros is realized without requiring either the cross-coupled path or the source-load coupling. For design purpose, the equivalent-circuit model is also derived and verified. In this study, a fourth-order patch-via-spiral bandpass filter with both good passband selectivity and miniaturized size of only 22.14 mm times5.08 mm (i.e., 0.188lambda g0 times0.043lambda g0 ) is implemented, where lambda g0 denotes the guided wavelength of the 50-Omega microstrip line at center frequency
Type
journal article
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