Compact single-pole-double-throw switchable bandpass filter based on multicoupled line

Chang Sheng Chen, Jian Fong Wu, Yo Shen Lin

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35 Scopus citations


A compact single-pole-double-throw (SPDT) switchable bandpass filter (BPF) composed of capacitively loaded multicoupled line is proposed. By replacing the quarter-wavelength impedance transformer at the common junction in conventional designs with a J-inverter, the circuit size is largely reduced and the design procedure is much simplified. As a demonstration, a proposed SPDT switchable BPF is designed and implemented with a center frequency f0 of 1.0 GHz and a bandwidth of about 10%. Low insertion loss in the on state, good isolation in the off state, and good linearity are obtained. The filter size without bias circuits and input/output traces is only 2.5 cm × 2.7 cm, which is about 0.158λg × 0.170 λg at f0.

Original languageEnglish
Article number6679292
Pages (from-to)87-89
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number2
StatePublished - Feb 2014


  • Bandpass filter (BPF)
  • single-pole-double-throw
  • switch


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