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\begin{document}

\title{A Broadband High-Gain Fabry-Perot Cavity Antenna for
Vehicle-to-Everything Applications}



\author[1]{Mia Maria Ulfah}%
\author[1]{Panuwat Janpugdee}%
\author[2]{Danai Torrungrueng}%
\author[3]{Hsi-Tseng Chou}%
\affil[1]{Chulalongkorn University}%
\affil[2]{King Mongkut's University of Technology North Bangkok}%
\affil[3]{Graduate Institute of Communication Engineering, National Taiwan University}%


\vspace{-1em}



  
  \date{May 25, 2024}


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\begin{abstract}
In this paper, a Fabry-Perot cavity (FPC) antenna with a partially
reflective surface (PRS) consisting of two dielectric slabs with
identical thickness and permittivity to increase the gain with wide
bandwidth is presented. The PRS is placed in front of a broadband
U-shaped microstrip patch antenna to create an air-filled cavity between
the PRS and the ground plane of the antenna structure. The configuration
of the two dielectric slabs aims to create a positive phase gradient of
the reflection coefficient, which strongly controls the gain bandwidth
performance. The proposed PRS was first designed and analyzed using a
transmission line model and then verified by a full-wave simulation. The
measurement results show that the proposed FPC antenna achieves a gain
improvement of up to 5 dB compared to the antenna without PRS, with a
3-dB gain bandwidth of 11.5\% and a broadside peak gain of 9.88 dBi. In
addition, the measured impedance bandwidth is approximately 18.8\% and
ranges from 4.95--6 GHz, which covers the required frequency band for
vehicle-to-everything (V2X) applications.%
\end{abstract}%



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