Offset‐fed trapezoidal monopole antenna for broadband circular polarization |
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Authors: | Trivesh Kumar Kapil Saraswat A. R. Harish |
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Affiliation: | Department of Electrical Engineering, Indian Institute of Technology Kanpur, Kanpur, India |
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Abstract: | 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. |
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Keywords: | axial ratio (AR) broadband antenna circular polarization (CP) monopole antenna |
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