The uniplannar slotline-fed slot-ring dual-mode bandpass filter using hairpin-slot coupling

Min Hua Ho, Chien Ching Chuang

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1 Citation (Scopus)


A novel uniplannar dual-mode bandpass filter (BPF) using a slotline-fed structure is proposed in this paper. A hairpin-slot coupling scheme is employed to couple a signal from a feeding-slotline to a slot-ring resonator. A coplanar waveguide (CPW) to slotline transition is used to conform SMA connectors to the circuit. Introduction of two orthogonally oriented feeding slotlines and a field perturbation that is 135° away from both feeds produces a dual-mode resonance in the slot-ring. The insertion loss of the filter is less than 5 dB at its resonant frequencies. Also, extending the region of field perturbation can increase the filter bandwidth. The out-band rejections are over 35 dB and 50 dB, respectively, at the lower-band and upper-band edges. Experiments are conducted to verify the circuit performance.

Original languageEnglish
Pages (from-to)407-412
Number of pages6
JournalJournal of the Chinese Institute of Electrical Engineering, Transactions of the Chinese Institute of Engineers, Series E/Chung KuoTien Chi Kung Chieng Hsueh K'an
Issue number4
Publication statusPublished - 2003 Nov 1

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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