作者: Yun-Long Lu , Gao-Le Dai , Changzhou Hua , Gaoming Xu , Kai Li
DOI: 10.1002/MMCE.20994
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摘要: In this article, several miniaturized bandpass filters BPFs with substrate integrated coaxial line quarter-wavelength spiral resonators were proposed. The coupling coefficients and external quality factors of proposed structures examined by using the commercial simulation software. With different combinations resonators, three two-order two high-order operating at 1.2 GHz 3-dB fractional bandwidth 8% designed, fabricated, measured. measured results showed that all return losses better than 10 dB over entirely passbands, overall circuit sizes only 0.044λ0 × 0.028λ0 0.047λ0 0.047λ0, where λ0 is wavelength in free space center frequency passband. Good agreements observed between simulated results. © 2016 Wiley Periodicals, Inc. Int J RF Microwave CAE 26:489-495, 2016.