Browsing by Author "Yang, HJ"

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Coalesced single-input single-output dual-band filter
(2003)
Chang, CH
;
Wu, HS
;
Yang, HJ
;
Tzuang, CKC
;
電信工程研究所
An experimental proof-of-concept two-terminal single-input and single-output (SISO) 1.7GHz/4.1GHz; dual-band filter is presented. It incorporates the so-call frequency-selective resonators that are composite in structure, cascading a microstrip and microstrip on a two-dimensional periodical surface or the so-called PBG(photonic bandgap) ground plane. The composite resonators add additional degrees of freedom for controlling the relative positions of the passband center frequencies, Thus making the dual-band filters, which essential share one common layout. Measured and theoretical filter characteristics for such coalesced dual-band filter agree excellently, validating the proposed concepts.
Miniaturized microwave passive filter incorporating multilayer synthetic quasi-TEM transmission line
(2005-09-01)
Wu, HS
;
Yang, HJ
;
Peng, CJ
;
Tzuang, CKC
;
電信工程研究所
This paper presents a novel approach to miniaturizing a transmission-line (TL)-based bandpass filter (BPF). The BPF is miniaturized by incorporating multilayer stacked synthetic quasi-TEM TLs made of complementary conducting strip (CCS) metal surfaces. The stacked CCS TLs are separated by a meshed ground plane, whose coupling effect was experimentally shown negligibly to affect desired circuit performance. A brief description of the symmetric third-order TL filter synthesis procedure is reported to map such an idealized BPF to the prototype made of the stacked synthetic CCS TLs. Excellent agreement is obtained by comparing the experimental and theoretical filter frequency responses showing a 2.46-dB insertion loss, a -16.8-dB return loss with under 5% offset of low-side out-band transmission zeros, and a 2% offset of center frequency. A quick estimate of the proposed miniaturized filter design based on synthetic quasi-TEM lines shows that the particular filter prototype approaches the process limit.