A 140 GHz High Efficiency Slotted Waveguide Antenna using a Low Loss Feeding Network

Yi-Wen Wu, Zhang-Cheng Hao, Zhuo-Wei Miao, Wei Hong, Jia-Sheng Hong

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29 Citations (Scopus)
439 Downloads (Pure)


This letter proposes a 140 GHz high-efficiency slotted waveguide antenna with a low-loss feeding network. The feeding network provides the same-magnitude but alternating-phase excitations for the slotted parallel-plate waveguide (PPW) array. The alternating-phase excitations are used to implement virtual electric walls (VEWs) for replacing the physical metal walls. Hence, the antenna efficiency is improved significantly. To verify the proposed method, an 8 × 8 slot array with the proposed feeding network is designed and fabricated, which has a fractional bandwidth of 10.17%, i.e., from 132 to 146.15 GHz. Experimental results show that the radiation and aperture efficiency of the prototype can be as high as 93.4% and 73.2%, respectively. The measured antenna has a peak radiation gain of 24.59 dBi at 137.5 GHz and a flat in-band gain. The proposed antenna provides a promising solution to develop high-efficiency upper millimeter-wave and sub-terahertz (THz) applications.
Original languageEnglish
Pages (from-to)94-98
Number of pages5
JournalIEEE Antennas and Wireless Propagation Letters
Issue number1
Early online date18 Nov 2019
Publication statusPublished - Jan 2020


  • 140 GHz
  • alternating-phase excitations
  • high-efficiency antenna
  • virtual electric walls (VEWs)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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