Modeling And Analysis Of MEMS Multilayer Microstrip Patch Antenna

The popularity of microstrip antennas has steadily increased over the past decades, due to a number of advantages such as small volume, low weight, low profile, conformability with existing structures, compatibility with integrated circuits and ease of fabrication. The research of microstrip will give far-reaching impact on radio communication systems. Usually the frequency bandwidth of microstrip patch antenna is relatively narrow. However, it can be effectively broadened with the employment of the micro-electro-mechanism systems technique to fabricate microstrip antenna with multilayer dielectric substrates and patch. Therefore the main work in this dissertation is to calculate the electromagnetic field components' three dimension distributions of this kind of complicated structure antenna and analyzing the antenna's characteristics.The finite-difference time-domain (FDTD) method is applied to the accurate simulation of MEMS multilayer microstrip patch antenna. The FDTD method allows rigorous treatment of complicated structures such as unregulated shape or dielectric interface. To make the algorithm inexpensive to implement, the absorbing boundary conditions (ABCs) in different propagating directions are treated with various precision. With a simple and efficient excitation scheme for the microstrip antenna, the near-end terminal needn't any special treatment. In addition, no dc source distortions are induced on the source plane and nearby. Using abundant information offering in time domain, the spatial distribution of electromagnetic fields on the antenna can be plotted, which makes it easy to understand the antenna's physical working procession. At the same time, the frequency dependence of the relevant parameters can readily be found using the Fourier transform of the transient current. The numerical results obtained by the FDTD method are compared with experimental results, and the comparison shows excellent agreement, proving the effectiveness of analysis on the MEMS microstrip antenna.The application of the FDTD method to imitation and analysis of the MEMS microstrip antenna effectually saves memories and the computing time. It consequently achieves preferable purpose. As a result, it shows the validity and superiority of the algorithm in analyzing complicate microstrip patch antennas...