Preliminary Study And Validation Of Broadband Electrically Small Antennas

This paper presents the theory limit on antennas' gain and bandwidth, as well as how to improve the bandwidth and miniaturize them, especially micro-strip antenna is elaborated.Normal micro-strip antenna is widely used for its low profit weight and volume, but it's band-width is a little poor. In this paper, an micro-strip antenna based on novel electromagnetic(photon) structure is designed , numerical experiments show that such kind of structure can decrease the surface-wave caused by thick substrate , thus the bandwidth and gain of antenna are improved evidently. Electromagnetic(photon) structure is drawing more and more attention and development of theories in this field will benefit a lot for the enhancement of antenna performance.FDTD algorithm is also addressed in this paper and is applied in a programme. After a micro-strip antenna is designed and implemented, its test result is compared with result from commercial software and the program based on FDTD, it shows that FDTD is a highly efficient technique for numerical application in electromagnetics.