소형 광대역 마이크로스트립 패치 안테나 설계에 관한 연구
(A) Study on the design of small-size broadband microstrip patch antennas
소형공대역 마이크로스트립 안테나설계 전자공학;
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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, several designs for small-size wide-bandwidth microstrip antennas are examined through simulation and experiment. To increase the bandwidth of microstrip patch antenna, a configuration of the U-slot patch antenna, and the L-probe-fed patch antenna is used. Furthermore, Several techniques are utilized to reduce the resonant length of these wideband microstrip-patch antennas : increasing the dielectric constant of the microwave substrate material, the addition of a shorting wall between the conducting patch and the ground plane, and the addition of a shorting pin between the conducing patch and the ground plane. The antenna bandwidth and radiation characteristics are calculated by ENSEMBLE ver. 5.0 and CST Microwave Studio 3 simulation software, and compared with the experimental results. Simulation and experimental results confirm that the size of the antennas can be reduced by as much as 82.4 %~90.4 %, while maintaining impedance bandwidths in excess of 20 %.