94 GHz Butler Matrix-Integrated MTM SIW Beamforming Array in Glass IPD

Shuping Li, Kun Dong Chiu, Donglin Gao, Chung Tse Michael Wu, Chien Nan Kuo

Research output: Contribution to journalArticlepeer-review


In this letter, we propose a low-profile beamforming array operating in the W-band, which is based on the Butler matrix integrated with substrate-integrated waveguide metamaterial (MTM) antennas. The proposed MTM antenna achieves an enhanced bandwidth through the use of multiple resonance modes of the composite right/left-hand structure. The implementation of the proposed array is done using a low-cost glass-based integrated-passive-device (IPD) technology. The microstrip-type Butler matrix with crossover structures is designed, and its bandwidth of 12.8% at the W-band is verified with measurements. Experimental verifications of the radiation patterns are conducted to demonstrate the beamforming characteristics of the proposed IPD antenna array.

Original languageEnglish (US)
Pages (from-to)2906-2910
Number of pages5
JournalIEEE Antennas and Wireless Propagation Letters
Issue number12
StatePublished - Dec 1 2023

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


  • Butler matrix
  • W-band
  • integrated passive device (IPD) technology
  • phased array
  • substrate integrated waveguide (SIW)


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