U형 접지면 상의 E-패치 안테나 설계
Design of an E-patch antenna on the U-shaped ground plane
U형접지 E패치 안테나설계 전자공학 무선공학;
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Microstrip patch antennas have a number of useful and interesting features due to low-cost, low profile, conformability, reduced weight, and ease of fabrication. But the most serious limitation of this technology is the narrow bandwidth of the basic element. The traditional microstrip patch antennas typically have an impedance bandwidth of only a few percent. For this reason much of the large volume of research and development in the area of microstrip antennas in the last fifteen years has been devoted to various techniques for the enhancement of microstrip antenna bandwidth. The bandwidth of a microstrip antenna can be enhanced by using parastic elements, impedance matching network and thicker substrate which has lower permitivity. In this paper, an E-shaped patch antenna on the U-shaped ground plane is designed and experimental studied. In order to reduce to cross-polarization level and to enhance the gain of the microstrip patch antenna, a U-shaped ground plane is employed in the microstrip patch antenna. As a main radiator, an E-shaped patch is used to reduce the antenna size as small as possible. Also to enhance the bandwidth of the antenna, a substrate of the lowest permittivity of which thickness as thick as possible is used and a rectangular patch is overlaid on the air substrate of the E-shaped patch antenna. The radiation characteristics of the antenna are calculated by CST Microwave Studio 3 simulation software. Experimental results show that by increasing the height of the sidewall of the ground plane, the antenna gain is increased and the cross-polarization level is decreased.