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Offset‐fed trapezoidal monopole antenna for broadband circular polarization
Author(s) -
Kumar Trivesh,
Saraswat Kapil,
Harish A. R.
Publication year - 2017
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.21063
Subject(s) - monopole antenna , optics , physics , axial ratio , coaxial antenna , circular polarization , microstrip antenna , broadband , reflection coefficient , dipole antenna , patch antenna , helical antenna , turnstile antenna , j pole antenna , acoustics , microstrip , telecommunications , antenna (radio) , engineering
A novel broadband circularly polarized monopole antenna consisting of an isosceles trapezoidal monopole antenna which is offset fed by a microstrip line is presented. By choosing an appropriate offset, it is possible to establish two orthogonal current components that are out of phase by 90° and thus producing circular polarization. The axial ratio bandwidth of the proposed antenna has been further increased by adding a vertical slot parallel to the microstrip feed line. The measured results show that the proposed antenna has a 34.57% (1.89 GHz to 2.68 GHz) 3 dB axial ratio bandwidth. The −10 dB reflection coefficient bandwidth is 122.53% (1.04 GHz to 4.33 GHz). The advantages of the proposed antenna are simplicity and a broad 3 dB axial ratio bandwidth.