Performance enhancement of microstrip antenna using artificial magnetic conductor reflection phase characteristics

Abstract

This paper investigates the behavior of a dipole antenna near the perfect electric conductor, perfect magnetic conductor, and artificial magnetic conductor (AMC). The phase variations due to reflector reflection coefficient and the distance between antenna and reflector are analyzed, and their effect on the antenna radiation patterns are studied for different frequencies. The cause of a null occurrence in the broadside direction of radiation pattern when using the AMC (or HIS) as a reflector is explored. It is shown that this degradation is due to the phase of the reflected waves at different angles from the reflector surface and this phenomenon may occur for any type of reflector. In the next step, a new broadband unit cell is presented. By changing the AMC reflection feature and the distance between the antenna and the ground plane for three different states, the performance of the printed dipole antenna is improved.The maximum gain of the antenna is enhanced by approximately 7 dB, 9 dB, and 9 dB for three different cases of AMC reflectors. Moreover, the 3 dB maxgain bandwidth of the structures are 33.81%, 29.17% and 20.84%, with profile size of 0.16λ, 0.4λ, and 0.4λ, respectively. All cases of the antenna with AMC structures have been fabricated and the measurement results are presented.

Dual rhombic loop‐based frequency selective surfaces for X‐band applications

“…These characteristics are also obtained by fractal FSSs, 20 combinations of other forms of unit cells, 21,22 and array of rotational symmetric square split ring resonators 23,24 . The band stop FSSs with linear reflection phase behave as good reflectors and thus, these have been assembled with planar antennas to enhance their gain 2,13 …”

“…FSSs are two‐ or three‐dimensional structures composed of large array of unit cells arranged in periodic or quasiperiodic fashion to exhibit these characteristics for a desired frequency, multiple frequencies when illuminated by the EM waves 1 . The band stop or band pass filtering characteristics of FSSs have been explored for various applications such as artificial magnetic conductors (AMCs), 2,3 reflectors, 4 absorbers, 5 radomes, 6 and EM shields 7,8 and so forth. Based on symmetry of unit cells toward incident EM waves, the FSSs can either be polarization dependent or independent.…”

AMC-Based Low-Profile Dual-Band Slotted Patch Antenna for IoT Devices in the Healthcare System

“…S- and C-shaped metallic rings are put inside the AMC unit cell to reduce back lobe emission from the patch antenna (Behera et al 2021 ). (Jamali Arand & Abbasi Arand 2021 ) investigated antenna behaviour near-ideal electric, magnetic, and artificial magnetic conductors. The antenna performance has been increased by adjusting the AMC reflection function and the distance between the grounded plane.…”