Abstract
In this article, polarization and pattern reconfigurable antenna is designed for 2.492 GHz Indian Regional Navigational Satellite System (IRNSS) band. The proposed antenna consists of a square radiating element fed with quad coaxial probes for polarization reconfigurability. It is surrounded by switch loaded octagonal parasitic ring for pattern beamwidth reconfigurability. RF switch loaded Electronically feeding network is used to fed the proposed antenna. The right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP) is realized by exciting feed ports in the antenna with 90° phase difference. At the same time switch loaded parasitic ring provides the pattern beamwidth reconfigurability for designed circularly polarized antenna. To verify the proposed design, a prototype is fabricated and tested experimentally. The measured axial ratio is well-below 3 dB in polarization mode. The measured 3 dB beam-width of the elevation gain patterns for the horizontal field component (Gϕ) varies between 107.40°∼113.51° and 74°∼77.55° in pattern reconfigurable modes. The maximum gain of 6.46 dBi is achieved in both polarization and pattern reconfigurable mode. The proposed antenna is intended for the IRNSS navigation receiver system and designed to minimize the effect of interference incident on the antenna by narrowing the pattern beamwidth near the horizon.
Published Version
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