CST – Computer Simulation Technology

Circularly Polarized Antenna With Steerable Dipole-Like Radiation Pattern
Adam Narbudowicz, Xiulong Bao, Max Ammann, Hammam Shakhtour, Dirk Heberling
IEEE Transactions on Antennas and Propagation
Volume: 62, Issue: 2, February 2014
519 - 526
Adaptive antennas, circular polarization, microstrip antennas, omnidirectional antennas
An omnidirectional circularly polarized antenna with a rotatable dipole-shaped radiation pattern is proposed. The antenna is realized using a back-to-back coupled microstrip patch arrangement. The pattern is rotated by means of a phase shift, enabling reception (or transmission) of signals fromall angles around a sphere. The method enables continuous pattern steering without the need for semiconductor or MEMS components integrated into the antenna. It also allows the use of more than one radiation pattern simultaneously, potentially providing coverage for any spherical angle. The theory is supported by simulation and measurement of four typical antenna configurations. The maximum gains are between 1.9 and 4 dBic and average axial-ratio varies between 2.5 and 3.65 dB at 2.47 GHz. The impedance bandwidth is from 2.4 to 2.51 GHz and the reconfigurable circular polarization is achieved from 2.464 to 2.484 GHz.

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