Gain and Bandwidth Enhancement of Circularly Polarized Msa Using PRS and Amc Layers

Abstract

In this paper, a circularly polarized (CP), high gain and wide bandwidth metal plated microstrip antenna (MSA) using partially reflecting surface (PRS) and artificial magnetic conductor (AMC) layers is proposed. The bandwidth of MSA is increased primarily, using AMC layers, and gain is increased by placing the antenna in a Fabry-Perot cavity (FPC) resonator. The two slotted AMCs are designed to resonate at two frequencies which electromagnetically couple to provide wide bandwidth. The FPC antenna with PRS and AMC layers provides higher gain, more impedance bandwidth, less gain variation and more miniaturization than the antenna without AMC layers. The proposed antenna provides S 11 < −10 dB, axial ratio (AR) < 3 dB and 17.4 dBi peak gain with gain variation < 3 dB over 5.725 GHz to 6.4 GHz frequency band. Broadside radiation patterns have side lobe level (SLL) < −20 dB, cross polarization (CPL) < −16 dB and front to back (F/B) lobe ratio > 20 dB. The overall antenna dimensions are 2.83λ 0 × 3.23λ 0 × 0.49λ 0 , where λ 0 is the free space wavelength corresponding to the central frequency of 5.725-6.4 GHz. The proposed structure is fabricated, and the measured results agree with simulation ones.

Gain bandwidth enhancement of microstrip antenna fed half wavelength Fabry Perot cavity antenna

“…A correction factor of about 18˚is applied, to take into account the slot in AMC-I and truncation and slot in AMC-II. 20 The resonant condition between AMC surfaces in FPC, is given by Reference 4.…”

Development of Multilayer Partially Reflective Surfaces for Highly Directive Cavity Antennas: A Study

“…Multilayer PRS broadband and high-gain antennas are analysed by Konstantinidis et al and Mohammed Aymen et al [13][14][15]. High-gain single-layer and multilayer antennas with di erent feed radiators and polarizations are analysed [8,[16][17][18][19][20][21][22][23][24][25][26][27][28][29]. e FPC antennas nd wide applications in modern wireless communication, in radars (RCS reduction), and in networking sectors [30][31][32].…”

Compact High Gain Resonant Cavity Antenna With via Hole Feed Patch and Hybrid Parasitic Ring Superstrate

“…In contrast, the compact designs have lower gain than others [7], [12]. Whereas, the compact RCAs obtaining high gain and wideband require multi-superstrate layers [6], [15], [16], [18] or complex superstrate structures [8], [10], [14], [17]. These RCAs have been focused on the study of novel feed patch and superstrate structures.…”

“…The structure of a metallic patch on low-cost air-substrate expresses low dielectric loss and high radiation efficiency. But it is not a robust structure and hard fabrication in the manufacture, especially for small antenna [5], [12], [14]. Meanwhile the array of patches is a good technique to enhance directivity; however, its drawbacks are the large area and requirement of a complex feeding network [9], [12].…”

“…Recently, the RCAs with microstrip superstrate are attractive structures with various configurations. Three general microstrip superstrates are frequency selective surface (FSS) [6], [10], [12]- [14], [17], metamaterial slab (MM slab) [10], [15], [16], [18], and parasitic patches (PPs) [5], [9], [14]. Their brief behaviors are summarized in Table 1.…”