Thin-Profile Wideband and High-Gain Microstrip Patch Antenna on a Modified AMC

Abstract

A low-profile, high-gain, and broadband U-slot cut artificial magnetic conductor (AMC) loaded patch antenna is presented in this letter. The wideband performance is achieved by strategically cutting two rectangular slots and inserting four strips onto a conventional AMC ground plane. Moreover, a defected ground structure is used to reduce the antenna size. As a result, four reflection zeroes are obtained within the antenna | <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$S_{11}$</tex-math></inline-formula> | curve. The antenna is characterized by a low profile ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\boldsymbol{h}/{\boldsymbol{\lambda }_0}\sim 0.05$</tex-math></inline-formula> , <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">${\boldsymbol{\lambda }_0}$</tex-math></inline-formula> is the free-space wavelength at the center frequency), wide bandwidth 58.6%, light weight, low cost, and wide 10 dBi gain bandwidth. The presented antenna is suitable for C-band satellite (3.7–4.2 GHz), 5.15–5.35 GHz WLAN, and the 5G in 3–6 GHz band applications.