Design of Pin Loaded Reconfigurable Patch Antenna for Wireless Communications
Keywords:
Antenna feeds, antenna radiation patterns, circular polarization, microstrip antennas, slot antennasAbstract
The design and performance analysis of a single fed reconfigurable patch antenna for circular polarization is presented. The patch has a square shaped slot etched on it. Four ultra-miniature diode switches are placed at appropriate positions to bridge the gap in the slot regions and are used to switch the nature of polarization between left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). The antenna achieves an impedance bandwidth (S11 ≤ -10dB) between 2.34 GHz to 2.4 GHz (2.53%) with a center operating frequency of 2.37 GHz. The surface current distributions on the radiating patch along with its corresponding radiation patterns measured at the operating frequency are plotted. The antenna achieves an axial ratio beam width (AR ≤ 3dB) of -25⁰ to 50⁰ for left-hand circular polarization and -40⁰ to 45⁰ for righthand circular polarization. Measured radiation pattern results show the antenna has a good cross-polarization isolation of -16.2 dB for RHCP configuration and -16.54 dB for LHCP configurations and hence the antenna is suitable for modern wireless applications.
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References
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