A Compact Microstrip Patch Antenna Based on Metamaterials for Wi-Fi and WiMAX Applications

Abstract

A low profile asymmetrical fractal boundary patch antenna based on reactive impedance surface (RIS) and a mushroom unit cell (MUC) is proposed and studied for dual band operation. The sides of the square patch antenna are replaced with asymmetrical half circled fractal curves for circular polarization operation at patch mode band. The fractal patch antenna is loaded with MUC for dual band operation. The antenna radiation characteristics are investigated and illustrated with both simulated and experimental results in detail. The 10-dB return loss bandwidth are 8.48% (3.21-3.49 GHz) and 2.59% (2.30-2.36 GHz) at upper and lower resonance frequencies, respectively. The 3-dB axial ratio bandwidth is 4.26% (3.21-3.35 GHz). A close agreement between simulation data with experimental results is observed.

Gain-Enhanced Metamaterial Absorber-Loaded Monopole Antenna for Reduced Radar Cross-Section and Back Radiation

“…Antenna gain can be increased with suitable reflectors, but the reflector must be placed a quarter-wavelength (λ/4) from the antenna to avoid cancelling the original and image currents, which is not ideal for low-profile antennas. To create a high-gain antenna with a low profile, we replaced the conventional reflector (similar to a perfect electric conductor (PEC)) with MMs, forming an artificial magnetic conductor (AMC) [8], or high impedance surface [9], due to its similar reflection coefficient as perfect magnetic conductors at resonance frequency [10][11][12]. High-gain antennas can be created using an AMC as the reflective ground [13][14][15], or superstrate [16][17][18].…”

Theory, Design, and Implementation of a New Family of Ultra-Wideband Metamaterial Microstrip Array Antennas Based on Fractal and Fibonacci Geometric Patterns

“…To meet these requirements, several techniques have been suggested, such as utilizing defected microstrip structure (DMS), a dielectric substrate with high permittivity, defected ground structure (DGS) at the ground plane, metamaterial (MTM) loading, or a mixture of all these [4][5][6]. Antenna designs with highly desirable features, such as compact size, high performance, low cost, and wide bandwidth, have become evergrowing demands [7,8]; however, while many frequencyindependent antenna designs provide these features, the current paper proposes that a printed, low profile array antenna design may be due to its ease of fabrication and robust overall structure.…”

Bandwidth-Enhanced Circularly Polarized Crescent-Shaped Slot Antenna via Circular-Patch Loading

“…The printed-slot antenna is a promising candidate due to its obvious advantages, such as wide impedance bandwidth, low cost, low profile, and ease of fabrication. Moreover, wireless-communication systems with circularly polarized (CP) antennas can provide better orientation-angle flexibility without causing severe polarization mismatch between transmitter and receiver [4][5][6][7]. Therefore, there have been many efforts to design broadband CP slot antennas [8][9][10][11][12][13][14][15][16].…”