Improvements of trapezoid antenna gain using artificial magnetic conductor and frequency selective surface

Abstract

<span>This paper presents the performance enhancement of the trapezoid antenna with Artificial Magnetic Conductor (AMC) and Frequency Selective Surface (FSS). The antenna, AMC and FSS structures are printed on 0.254 mm of RT/Duroid 5880 high frequency laminate. The performances of the antenna with and without AMC and FSS were evaluated. Three cases are analyzed; antenna alone, antenna with AMC and antenna with AMC-FSS. The 2x3 arrays of AMC and AMC-FSS were positioned at the back of the antenna with 6 mm air gap. The antenna alone works at 12 GHz, and shifted to 12.35 GHz and 12.33 GHz for case 2 and case 3, respectively. Despite the shift in the resonance, the antenna is still operating well at 12 GHz with a return loss –16.70 dB for case 2 and–16.84 dB for case 3. Case 3 effectively enhanced the antenna gain from 4.43 dB to 6.74 dB and contributed to a directive antenna. Moreover, case 3 also successfully reduced the radiation of the antenna that penetrates into human body as the antenna is applied for on-body applications. </span>

Wide-band metamaterial perfect absorber through double arrow shape printed on a thin dielectric

“…It successfully attracts researchers' interests due to the versatility of controlling electromagnetic (EM) wave incident, intangibility nature of property features [2]. Numerous interesting properties are found concerning metamaterials; left handed [3], electromagnetic band gap (EBG) [4], frequency selective surface (FSS) [5], artificial magnetic conductor (AMC) [6] and absorber [7]. The left handed structure offers an unusual material properties which are double negative of permittivity and permeability at resonating frequency, EBG suppresses unwanted surface waves within a band gap, FSS selects specific electromagnetic waves like a filter effect and AMC reinforce an image currents with the real currents for more efficient low profile antenna.…”