Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FB2
Session:
Number:4FB2-5
Analysis Design of Broad-Beam MSA Array Using Cavity Back Slot-Coupling
Thana Puklibmoung, Piyaporn Krachodnok, Rangsan Wongsan,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
The antennas technology for space and Geographical Information System (GIS), especially, Low-Earth Orbit (LEO) satellite communication systems have been popularly to investigate. The parabolic reflector antenna is the most widely used in satellite communication due to high gain and narrow-beam. However, the feed horn and their arm are placed at the front of the reflector causing obstruct the aperture and its efficiency is degraded, while the large curvature is generally affected to the aerodynamic of the satellite when launching into the orbit. To solve these problems the novel type of the microstrip array is designed [1, 2]. Essentially, this microstrip array has no limitation in its dimensions and has much less distortion in its planar shape. This operation is similar to the parabolic reflector that naturally forms a planar phase front when a feed is placed at its focus. The advantaged of the microstrip array are low cost, small size, light weight and easy installation. Since LEO satellite moves in very high-speed, therefore, time required for an earth station communicates with satellite is limited. The important techniques for overcoming these limitations, shaped reflector antenna [3], and microstrip reflectarray [4, 5] which are duplicated the same radiating aperture as parabolic backscatters were designed. Nevertheless, the shaped reflector and reflectarray antennas are used the feed horn place at the front of the reflector causing obstruct the aperture, and its efficiency is degraded. In this paper, we propose an analysis design of broad-beam microstrip antenna (MSA) array using cavity-back slot-coupling. This structure is excited by a linear electric probe that is located at the center of inner surface of the rectangular cavity [6, 7]. To achieve broad-beam antenna, phase of each array element in the microstrip array antenna is specific designed to emulate the curvature of the parabolic backscatter function by adjusting the distance between microstrip arrays. Finally, the results of the return loss (S11) and radiation pattern of the proposed antenna have been simulated by using antenna analysis software CST-Microwave studio. Simulations results are giving to verify present our described.