40-GHz MMIC SPDT and multiple-oort bandpass filter-integrated switches

Shih Fong Chao*, Che Chung Kuo, Zuo-Min Tsai , Kun You Lin, Huei Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


40-GHz monolithic microwave integrated circuit (MMIC) single-poledouble- throw and multiple-port bandpass filter-integrated switches based on electronically switchable resonators are proposed. The proposed multifunction chip integrates a multiple-port switch with bandpass filter functions in a single chip. The switchable resonators are formed by quarter-wavelength stepped-impedance resonators with passive HEMT loading at one end. By properly allocating the resonant frequencies of the resonators in their on and off modes, a filter-integrated switch can perform a bandpass response with spurious suppression in the on state and achieve wideband isolation in the off state. The technique of using shared resonators is also introduced in the circuit design to reduce the overall circuit size. The results show the proposed circuits successfully integrate a MMIC switch with bandpass filter functions into a single circuit component.

Original languageEnglish
Pages (from-to)2691-2699
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12
StatePublished - 1 Dec 2007


  • Bandpass filter
  • Monolithic microwave integrated circuit (MMIC)
  • Multiple port
  • Single-pole double-throw (SPDT)
  • Stepped-impedance resonator (SIR)
  • Switch

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