Green’s Functions for Probe-Fed Arbitrary-Shaped Cylindrical Microstrip Antennas

PROJECT TITLE :

Green’s Functions for Probe-Fed Arbitrary-Shaped Cylindrical Microstrip Antennas

ABSTRACT:

The potency of a method of moments procedure for microstrip antennas is strongly smitten by the convergence of the inverse Fourier transformation (IFT) from the spectral to the spatial domain. This is especially true when considering cylindrical microstrip antennas (CMAs). In the cylindrical case, the calculation of the two-dimensional Green’s functions stays inherently time-consuming. In the planar case, Green’s operate will be reduced to a one-dimensional perform. The problem, however, becomes a true bottle-neck when probe feeding of a CMA is considered, as the traditional IFT used to calculate the excitation within the spatial domain ends up in an enormous IFT time. During this paper, this problem is explicitly treated. The asymptotical behavior of the probe-related spectral Green’s functions (GFs) is rigorously derived, subtracted, and the corresponding reaction integrals are inverse Fourier transformed without the occurrence of any cylindrical functions. This results in a abundant improved calculation efficiency for this kind of feeding, evident for each thin and thick substrates. Numerical results for CMAs with complicated-formed patches are presented, applicable to each smaller and larger bandwidths. Many structures are fabricated and measurements are in sensible agreement with simulations.

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