2.4-GHz Absorptive MMIC Switch for Switched Beamformer Application

Wei Ting Fang, Chia Hao Chen, Yo Shen Lin

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


In this paper, a GaAs absorptive single-pole double-throw (SPDT) RF switch and its application to a 2.4-GHz switched beamformer module are presented. The proposed absorptive SPDT RF switch features low-power consumption and low insertion loss with good output matching both in the on and off states. Specifically, the measured insertion loss in the on state is less than 1 dB, and the measured input and output return losses are both better than 11.2 dB from 1.9 to 2.6 GHz. The measured output return loss in the off state is better than 15 dB, and the measured isolation is better than 24.7 dB in the same frequency range. Two proposed absorptive SPDT switches are then employed to form an absorptive single-pole four-throw RF switch, and it is integrated with a miniaturized 4 × 4 Butler matrix using the integrated passive device (IPD) technology to achieve a compact 2.4-GHz switched beamformer module with a very low profile. Specifically, the module size is 4.9 mm × 5 mm with a thickness of only 0.4 mm. The IPD beamformer module is then used to realize a low-profile 2-D scanning antenna array, and 16 different beams in azimuth and elevation dimensions are successfully generated.

Original languageEnglish
Article number7902164
Pages (from-to)3950-3961
Number of pages12
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number10
StatePublished - Oct 2017


  • Absorptive RF switch
  • Butler matrix
  • bridged-T coil
  • integrated passive device (IPD)
  • switched beamformer


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