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2022-07-11
Wideband and Circularly Polarized Designs of Modified E–Shape Microstrip Antennas for GSM and GPS Applications
By
Progress In Electromagnetics Research C, Vol. 121, 107-125, 2022
Abstract
Variations of modified E-shape microstrip antennas are proposed which realize wideband and circularly polarized responses inside the same impedance bandwidth but in separate frequency regions. The offset pair of slots in E-shape patch tunes the spacing in between TM02, TM10 and TM11 mode frequencies, and for the design in 900 MHz frequency band, it yields the total impedance bandwidth of 34.15%, in which circularly polarized bandwidth of 4.75% is present towards the higher frequency region. In comparison with the wideband E-shape or its circularly polarized variation, proposed configurations yield larger total impedance and same axial ratio bandwidth, but without overlapping bands for the wideband and circularly polarized regions. A compact half E-shape microstrip antenna is proposed, which yields total impedance bandwidth of 38.8%, with a circularly polarized bandwidth of 5.3%, present towards the higher frequency region. Further, the wideband E-shape variations are presented on a thinner substrate by using a bow-tie shape ground plane profile. Against the conventional ground plane design, it offers more than 12% increase in the bandwidth for 0.03λg reduction in the substrate thickness. Thus, as against the reported E-shape variations, proposed study presents a new design feature of traditional E-shape patch that provides separate regions for the wideband and circularly polarized responses, occupying the same impedance bandwidth.
Citation
Venkata A. P. Chavali Amit A. Deshmukh , "Wideband and Circularly Polarized Designs of Modified E–Shape Microstrip Antennas for GSM and GPS Applications," Progress In Electromagnetics Research C, Vol. 121, 107-125, 2022.
doi:10.2528/PIERC22042101
http://www.jpier.org/PIERC/pier.php?paper=22042101
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