A Bandwidth-Enhanced Cavity-Backed Slot ArrayAntenna for mmWave Fixed-Beam Applications

Wai Yan Yong, Abolfalz Haddadi, Thomas Emanuelsson, Andrés Alayón Glazunov

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Abstract

A bandwidth-enhanced 8X8 cavity-backed slot array antenna for fixed beam applications is presented. The antenna consists of four 2X2 subarrays fed by ridge gap waveguide and a modified bow-tie coupling slot in the cavity layer. The proposed bow-tie coupling slot provides additional 10% impedance bandwidth as compared to the traditional rectangular coupling slot. The fabricated prototype demonstrates an S_{11} <-10dB fractional impedance bandwidth and a 3dB gain-drop bandwidth of approximately 28% and 25%, respectively, with peak gain of 26.4dBi, aperture efficiency >60% and cross-polar discrimination 40dB. Measurements show good agreement with simulations. Moreover, we show the impact of the dimensions and shape of the cavity coupling slot on the bandwidth enhancement. The bandwidth enhancement is explained by the double-ridge slot behavior of the bow-tie coupling slot, which shows a more wideband behavior than the traditional rectangular coupling slot behaving like a cross-section of a waveguide.
Original languageEnglish
Number of pages5
JournalIEEE Antennas and Wireless Propagation Letters
DOIs
Publication statusAccepted/In press - 7 Sep 2020

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