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Experimental investigations of rectangular and circular suspended microstrip patch antennas with dielectric resonator loading at X-band are reported. With loading, enhanced impedance bandwidth to about 18% is achieved in a single circular patch as compared to 13% for a single rectangular patch. In both cases, with loading, there is practically no change in the respective 3-dB beam widths of the radiation patterns in E-and H-planes.ABSTRACT: In this paper, a novel preconditioner scheme slot neighbour (SN) preconditioner is applied to dense matrix equations derived from integral equations for a slot-array antenna in order to improve the convergence of iterative integral-equation solvers, such as the conjugate-gradient (CG) method. The preconditioner accounts for expansionfunction-testing-function interactions in the vicinity of a given slot, requiring an order of N s ϫ N b complexity for each N s slot and each slot with N b expansion unknowns. A typical slot-array antenna is analyzed and good results demonstrate the validity of the proposed algorithms.

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