Metamaterial based compact quad band microstrip antenna for wireless applications
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Date
2018-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
With the advancement in the field of wireless communication, advancement in the field of antenna becomes essential as it constitutes an integral part of communication system. As per the requirement of wireless communication system the antenna needs to be compact. Microstrip antenna attracts the attention for this purpose because of its low profile and low cost. As per IEEE standards frequency range from 2 to 6 GHz is assigned for wireless applications. Antenna operating on multiple frequency bands, simultaneously, is very useful for wireless applications. A compact quad band microstrip antenna based on metamaterial structures is designed, simulated, fabricated and measured in this thesis. The size of the antenna is 37×37×1.6 mm3. Dielectric substrate used is FR4 epoxy having dielectric constant εr = 4.4 and loss tangent tan 𝛿 = 0.02. Proposed antenna is miniaturized by cutting a rectangular CSRR at the patch. One square shaped and two circular CSRRs are cut in ground plane to enable multiband behavior. Ground plane is also defected with two rectangular slots to enhance gain of proposed antenna. The proposed antenna operates on four frequency bands with impedance bandwidths of 480 MHz, 270 MHz, 180 MHz and 140 MHz with respective resonant frequencies at 2.7 GHz, 3.8 GHz, 5.4 GHz and 5.98 GHz. The parameters in terms of reflection coefficients and VSWR for the proposed antenna are measured and compared to the simulated parameters. The simulated and measured results are very close to each other. These data are also compared to earlier reported data through which it is concluded that the proposed metamaterial based microstrip antenna has compactness in size and quad band.
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