Design of a Dual Band Microstrip Antenna with Broadband and Circular Polarization Characteristics Useful for Different Wireless Applications
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Abstract
A multiband microstrip antenna has been proposed in this research article. The proposed antenna provides two bands. Two obtained bands are wideband in nature. Lower frequency band ranges from (1.3–1.6) GHz with 20.68% of bandwidth. Higher frequency band ranges from (2.7-5.7) GHz with 71.42% of bandwidth. Higher frequency band provides two 3 dB axial ratio bandwidth (ARBW). The % of 3 dB ARBW is 5.94% and 34%, respectively for the first and second circular polarized bandwidths, respectively for the higher frequency band. Measured peak gain of 4.7 dBi and 3.5 dBi have been at the lower band and the upper band of the proposed antenna respectively. Also, good radiation patterns have been obtained from the desired frequency of radiation. Low cost and easily available FR4 material are used as a dielectric substrate for modeling the proposed structure. The proposed antenna is designed and simulated by using the ansoft high frequency structure simulation (HFSS) software. The antenna is fabricated and results are compared with the simulated results. The reflection co-efficient, gain and radiation patterns of the proposed antenna are discussed here. There are good agreements between the simulated and measurement results. The antennas may be useful in part of L band, part of S band, part of C band, Wi-MAX and WLAN applications etc.
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