Ultra-Wideband Millimeter-wave Planar Array Antenna with an Upside-down Structure of Printed Ridge Gap Waveguide for Stable Performance and High Antenna Efficiency
Journal article, 2021

In this letter, a wideband millimeter-wave planar array antenna with a printed ridge gap waveguide (PRGW) feeding network is presented. A planar bowtie antenna fed by the PRGW is employed as the array radiation element which combines the bowtie with an upside-down electromagnetic bandgap (EBG) part by using lamination. Thus, with this new upside-down structure the proposed array antenna achieves a stable, wideband and high-antenna-efficiency performance. A prototype of "8""8" element array is fabricated and measured. The measured results show that the proposed array has an impedance matching bandwidth (S11-10 dB) of 50.3% from 18.6 to 31.1 GHz. The maximum measured gain is 22.1 dBi at 29 GHz, and the total antenna efficiency is above 60% with a bandwidth of 45% from 18.8 to 29.8 GHz.

Antenna measurements

Antenna arrays


Periodic structures


Planar arrays



printed ridge gap waveguide

planar array antenna



Tianling Zhang

Xidian University

Lei Chen

Xidian University

Ashraf Uz Zaman

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Jian Yang

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

IEEE Antennas and Wireless Propagation Letters

1536-1225 (ISSN)

Vol. 20 9 1721-1725 9477072

Areas of Advance

Information and Communication Technology

Subject Categories


Communication Systems

Other Electrical Engineering, Electronic Engineering, Information Engineering



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