Metamaterials are popular in the antenna research area because of their unusual properties. Metamaterials can be used to surpass disadvantages of conventional microstrip antenna such as larger bandwidth, reduction in size of the antenna, better return loss and improvement in gain, directivity with acceptable amount of input power. The main aim of this paper to analyse the best model required to design a patch antenna with respect to the relevant application.
The proposed fractal antenna is designed to operate at the frequency of 7.23 GHz using an FR4 substrate of relative permittivity of εr = 4.4. Different optimization techniques have been used, such as slots, use of meta-materials, fractal design, Feeding Techniques, to improve some antenna parameters. The resulting fractal design provides a gain of 10 dBi and a return loss of -19.8 dB which is about 90% of the input power radiated.
This paper proposes a dual band elliptical antenna for ISM and WIMAX applications.The antenna consists of elliptical patch connected to a line feed with a coplanar waveguide ground. This antenna operates at 2GHz and 3.5GHz with one port.This allows operation at ISM and WIMAX frequencies. The return loss dB(S(1,1)=-16.8910 at 2GHz and dB(S(1,1)=-18.4981 at 3.5 GHz are obtained. The antenna is fabricated on 65mm×120mm×1.6mm low cost FR4 epoxy substrate.The thickness of the substrate is 1.6mm. The antenna's radiation characteristics are verified and investigated by simulation results including radiation pattern,gain ,rEtotal ,return lossand 3D polar plot. The antenna design has been simulated by using Ansoft HFSS software.
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