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Design of miniaturized substrate integrated coaxial line bandpass filters with quarter‐wavelength spiral resonator
Author(s) -
Lu YunLong,
Dai GaoLe,
Hua Changzhou,
Xu Gaoming,
Li Kai
Publication year - 2016
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20994
Subject(s) - band pass filter , resonator , passband , bandwidth (computing) , center frequency , wavelength , materials science , return loss , microwave , optoelectronics , coaxial , optics , electronic engineering , electrical engineering , physics , engineering , telecommunications , antenna (radio)
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 were examined by using the commercial simulation software. With different combinations of the proposed resonators, three two‐order and two high‐order miniaturized BPFs operating at 1.2 GHz with 3‐dB fractional bandwidth of 8% were designed, fabricated, and measured. The measured results showed that all the return losses were better than 10 dB over the entirely passbands, and the overall circuit sizes of two‐order and high‐order BPFs were only 0.044 λ 0 × 0.028 λ 0 and 0.047 λ 0 × 0.047 λ 0 , where λ 0 is the wavelength in free space at the center frequency of the passband. Good agreements were observed between the simulated and measured results. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:489–495, 2016.