Efficient Method for Analyzing Microstrip Antennas with a Dielectric Cover Usinga Spectral Domain Moment Method

摘要

An efficient method is presented for analyzing rectangular microstrip antennaswith a dielectric cover, using a spectral domain moment method. The use of this moment method involves the numerical evaluation of slowly decaying Sommerfeld-type integrals. Several computational problems are involved with the evaluation of these integrals. Some methods to avoid these problems will be discussed in this report. The most interesting method that we developed is the one that accelerates the calculation of the infinite integrals over the slowly decaying (and strongly oscillating) integrands. This slow convergence is caused by the source singularity in the Green's function of the dielectric slab. To overcome this disadvantage, we developed a method of rewriting the integrals as a sum of a closed form expression and a quickly converging integral, resulting in a reduction of computer time by a factor 20. This is 99ne for sinusoidal entire domain basis functions on the patch of the microstrip antenna. It should be noted that this method can also be applied for other types of basis functions.