No abstract

No 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.

Compact circularly polarized single feed microstrip antenna using fractal curve as boundary is presented. It is shown that by using fractal curve as boundary to the square patch the size can be reduced by more than 50% without much reduction in gain of the antenna. The antenna gives a good circular polarization with minimum axial ratio close to 0 dB at the center frequency of 2234 MHz. Three decibel axial ratio bandwidth of about 0.81% and 10 dB impedance bandwidth of about 3.25% are obtained with the proposed antenna. The antenna provides almost constant gain of about 4 dBi over the frequency band of operation. Measurement results are compared with simulated results and a very good agreement is obtained. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 141–147, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24854

No abstract