A Dual-Band High-Gain Subwavelength Cavity Antenna with Artificial Magnetic Conductor Metamaterial Microstructures

Abstract

This paper presents dual-band high-gain subwavelength cavity antennas with artificial magnetic conductor (AMC) metamaterial microstructures. We developed an AMC metamaterial plate that can be equivalent to mu-negative metamaterials (MNMs) at two frequencies using periodic microstructure unit cells. A cavity antenna was constructed using the dual-band AMC metamaterial plate as the covering layer and utilizing a feed patch antenna with slot loading as the radiation source. The antenna was fabricated with a printed circuit board (PCB) process and measured in an anechoic chamber. The |S11| of the antenna was −26.8 dB and −23.2 dB at 3.75 GHz and 5.66 GHz, respectively, and the realized gain was 15.2 dBi and 18.8 dBi at two resonant frequencies. The thickness of the cavity, a sub-wavelength thickness cavity, was 15 mm, less than one fifth of the long resonant wavelength and less than one third of the short resonant wavelength. This new antenna has the advantages of low profile, light weight, dual-frequency capability, high gain, and easy processing.

Applications of Metamaterials and Metasurfaces

“…The third layer consists of a square metal patch with a central circular slot. Between the second and third layers, a square dielectric block is inserted [28]. The magnetic and electric wall boundary conditions were forced along the AEx and AEy directions to produce a waveguide.…”

Design Implementation of Trapezoidal Notch Band Monopole Antenna for LTE, ISM, Wi-MAX and WLAN Communication Applications

“…In total, there are 11n bands in switching conditions. A split ring model-based structure has been used to design a metamaterial-based antenna by Venkateswara Rao [5]. The designed notch antenna structure is constituted on a conformal dielectric and the flexible characteristics are studied and found satisfactory in simulation and prototype measurement.…”

Design of Dual-Band Microstrip Patch Antenna for Wireless Local Area Network Applications

“…A dual-band microstrip patch antenna would enable both communication systems to operate using the same antenna, which could save space and reduce costs. Designing a dual-band microstrip patch antenna that operates at WLAN frequency bands is challenging [11], as the antenna needs to meet the requirements of both frequency bands. Researchers may focus on developing new antenna designs that can support both frequency bands and optimize the performance of the antenna in both frequency bands.…”