CST – Computer Simulation Technology

Dual Circularly Polarized Series-Fed Microstrip Patch Array with Coplanar Proximity Coupling

Title:
Dual Circularly Polarized Series-Fed Microstrip Patch Array with Coplanar Proximity Coupling
Author(s):
Shengjian Jammy Chen, Christophe Fumeaux, Yasuaki Monnai, and Withawat Withayachumnankul
Source:
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Vol./Issue/Date:
Vol. 16, 2nd January 2017
Year:
2017
Page(s):
pp. 1500 - 1503
Keywords:
Series-fed antennas, antenna arrays, travelling wave antennas, leaky-wave antennas, circular polarization
Abstract:
We demonstrate a concept of compact and highlyefficient circular travelling wave series-fed microstrip patch array working at 10 GHz. The patch elements are excited by a microstrip line through coplanar proximity coupling. A dual-port feeding allows to select the direction of the travelling waves, and consequently the sense of circular polarization of the patches. Simultaneous feeding to both ports with proper amplitude and phase difference can result in radiated waves of arbitrary polarization. Owing to the circular array arrangement and the strong proximity coupling, the antenna exhibits a compact structure and achieves a high antenna efficiency of 90% with 7 patches. Based on reciprocity, the antenna can readily be also utilized for polarimetry applications for which the signal amplitude at each port is proportional to the amplitude of each individual sense of polarization. Measured results of an antenna prototype successfully validate the concept.
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