Gain Enhancement of a CPW-Fed Monopole Antenna Using Polarization-Insensitive AMC Structure

Abstract

A polarization-insensitive dual-band artificial magnetic conductor (AMC) structure is designed and experimentally verified. It consists of a planar array of annular ring-slot loaded rectangular patches. Details of the proposed structure and origin of the two bands is discussed. Through simulations and measurements, it is shown that the structure is insensitive to polarization of the incident wave. The tuning of the higher AMC band is demonstrated by varying the capacitance of the annular slot through its width variation. The designed AMC is used as a reflector for a wideband monopole patch antenna. It is shown experimentally at the antenna frequencies in the AMC band that the gain of the antenna improves by almost 10 dB and front-to-back ratio is improved by 15 dB.Index Terms-Dual-band artificial magnetic conductor (AMC), gain enhancement, monopole antenna.

Gain Enhancement of a Tetra-band Square-Loop Patch Antenna Using an AMC–PEC Substrate and a Superstrate

“…One significant property of an AMC structure is it reflects the incident wave without any phase reversal unlike a PEC that reflects waves with 180°phase reversal. It means the incident and reflected waves are in-phase on the AMC structure over some frequency ranges and it presents a high impedance surface (HIS) to the incident waves [6,7]. The frequency range for which the reflection coefficient phase is between ±90°is defined as the AMC bandwidth [6,9] and [14].…”

“…A number of methods have been used to enhance gain of patch antennas. Of these methods, two efficient techniques are using electromagnetic bandgap (EBG) structures [6,7], and stacked patch antennas [8].…”

Gain Enhancement of Monopole Antenna using AMC Surface

“…Metamaterial is an artificial resonant structure that is designed to obtain specific characteristics which are not naturally occurring in nature [1]. These unique characteristics of metamaterial have been used extensively in antennas and microwave applications in order to improve the desired performances [2]. The artificial magnetic conductor (AMC) is a type of metamaterial which introduces an in-phase reflection within the band gap of a desired frequency.…”

A High-gain and Low-scattering Waveguide Slot Antenna of Artificial Magnetic Conductor Octagonal Ring Arrangement

“…In [3], [4], AMC is used as the back-cavity or cladding to achieve the low-profile antennas. In order to improve the gain of antenna, AMC is loaded on the aperture, [5][6][7][8]. In [5], the AMC is loaded around the rectangular microstrip antenna, the gain is improved in consequence of the change of surface current.…”