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A Study on the Design of Wideband Microstrip Cross Slot Array Antennas with Circular Polarization  

Min, Kyeoung-sik (Dept. of Electromagnetic Waves Engineering, Korea Maritime University)
Ko, Jee-Won (Dept. of Electromagnetic Waves Engineering, Korea Maritime University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.8, no.4, 2004 , pp. 894-900 More about this Journal
Abstract
There are many types of circularly polarized(CP) microstrip antenna elements, which are used as a good unit radiator. Since an advantage of CP antenna is no strict alignment requirements between Rx and Tx system, the printed antennas with circular polarization are very often used in numerous satellite and mobile radio systems. In order to realize the broad bandwidth of 3 dB axial ratio and impedance of CP microstrip antenna, complex feed structure and tri-plate patch element have been researched. This paper describes a design of wideband microstrip cross slot array antennas with circular polarization. The proposed antenna is composed of an open-ended microstrip feed line as a feeder and a cross slot as a radiator for circular polarization. To realize the wide bandwidth, tri-plate structure are considered and cross slot is electromagnetically coupled with feed line. Optimum parameters of 1-element cross slot antenna are analyzed and designed by method of moments. These parameters are also applied to may antennas design considered the mutual coupling between radiating elements. Right hand circular polarization(RHCP) and left hand circular polarization(LHCP) of the proposed antenna are easily controlled by asymmetrical cross slot structure and slot position. In 1-element and 15-element cross slot array antenna, the good axial ratio of 1 dB below and the broad bandwidth characteristics of antenna are obtained.
Keywords
Microstrip; Circular Polarization; Cross Slot; RHCP; LHCP;
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