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A wideband polarization reconfigurable isosceles trapezoidal monopole antenna
Author(s) -
Saraswat Kapil,
Harish A.R.
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21602
Subject(s) - ground plane , reflection coefficient , axial ratio , optics , wideband , circular polarization , physics , monopole antenna , polarization (electrochemistry) , linear polarization , microstrip antenna , bandwidth (computing) , microstrip , magnetic monopole , electrical engineering , antenna (radio) , telecommunications , engineering , chemistry , laser , quantum mechanics
In this article, a polarization reconfigurable isosceles trapezoidal monopole antenna for the circular polarization (CP) is presented. A trapezoidal monopole and the ground plane are on the same side of the dielectric substrate. The monopole is excited by a reconfigurable T‐shaped 50 Ω microstrip feed line and reconfigurable vertical slots are incorporated in the ground plane to realize switchable wideband CP. For the different switching states of the p‐i‐n diodes, linear polarization, left‐handed and right handed CP can be achieved in the boresight direction (+ z direction). The antenna prototype is fabricated and tested. The measured reflection coefficient bandwidth (|S11| < −10 dB) is 31.2% (2.13 ‐ 2.91 GHz) and axial ratio bandwidth (axial ratio < 3 dB) is 22% (2.18 ‐ 2.72 GHz) for the CP. The measured reflection coefficient bandwidth is 18.56% (2.15 ‐ 2.59 GHz) for linear polarization.