第五章3现代天线技术.pdf

Shanghai Jiao Tong University 现代天线技术 ——第五章 小天线(3) 金荣洪教 授 耿军平 副教授 上海交通大学电子工程系 2008－9 /po/info/info_detail.jsp?infoId=info4 4000000436 1 References：  Dielectric Resonator Antennas，K. M. Luk and K. W. Leung，Both of the City University of Hong Kong ， RESEARCH STUDIES PRESS LTD. Baldock, Hertfordshire, England ， 2003. 2 Dielectric antenna Characters Cylindrical DRA  Hemispherical DRA  DRA ARRAYS  DRA WITH AIR GAP 3 Dielectric antenna （DRA）  The use of a dielectric resonator as a resonant antenna was proposed by Professor S. A. Long in the early nineteen eighties.  Since the dielectric resonator antenna has negligible metallic loss, it is highly efficient when operated at millimetre wave frequencies.  Conversely, a high-permittivity or partially metallised dielectric resonator can be used as a small and low- profile antenna operated at lower microwave frequencies.  Low loss dielectric materials are now easily available commercially at very low cost.  This would attract more system engineers to choose dielectric resonator antennas when designing their wireless products. 4 DRAs of various shapes 5 Cylindrical DRA Analysis method：Green Function