CST – Computer Simulation Technology

RIS-Based Compact Circularly Polarized Microstrip Antennas
Kush Agarwal, Nasimuddin, Arokiaswami Alphones
IEEE Transactions on Antennas and Propagation
Volume: 61, Issue: 2, February 2013
547 - 554
Circular polarization, microstrip antenna, miniaturization, reactive impedance surface (RIS), slotted\slit patch
Compact, asymmetric\symmetric-slotted\slit-microstrip patch antennas on reactive impedance surface (RIS) are proposed and studied for circularly polarized (CP) radiation. The antennas consist of a slotted-slit-microstrip patch on a RIS substrate. The CP radiation with compact size is achieved by asymmetric\symmetric-slot-slit cut along the orthogonal\diagonal directions of the patch radiator. The asymmetric\symmetric-slotted\slit microstrip patches on the RIS structure are used for furtherminiaturization of the antenna with improvement in CP radiation. The measured results of the compact asymmetric-cross slotted square patch antenna are 1.6% (2.51–2.55 GHz) for 3-dB axial ratio bandwidth, 5.2% (2.47–2.60 GHz) for 10-dB return loss bandwidth, and 3.41 dBic for gain over 3-dB axial ratio bandwidth. The overall antenna volume is on a low cost FR4 substrate at 2.5 GHz.

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