The integral equation -method of moments approach to analyzing a cavity backed, slot excited dielectric resonator antenna is validated experimentally (by measure-ments). First, the closed rectangular metal box is considered to validate the cavity treatment. Then, the whole DRA structure, i.e. the cavity along with the slot and dielectric resonator, is tested to prove definitively correctness of the approach used. I. IntroductionIn recent authors' paper [1] the integral equation-method of moments (IE-MoM) approach to efficient analyzing a dielectric resonator antenna (DRA) excited by a slot and backed by a rectangular cavity filled with a multilayered medium has been presented. The method of calculation, and especially the computer code, have been carefully validated by comparison to the data (results of investigation) published in the literature [2, 3]. However, the data did not allow us to test full capabilities of the software developed. Although we tested a radiating slot and a hemispherical DRA over a rectangular cavity, the cavity itself was filled with a homogeneous medium (air), and hence it was not possible to check one of the main advantages of our method, namely its ability to take into account a layered structure of a microwave circuit enclosed inside the cavity. Thus, since the best method to validate the theory is to compare the result of calculations with experimental data, we have decided to curry out several practical tests. The paper briefly recalls the theory related to the IE-MoM method and describes the results of the experiment.

The Letter describes problems related to use of microstrip antennas in cellular and

Far-field pattern synthesis of small antenna arrays is a nontrivial problem, mainly due to mutual coupling, ojten precluding the use ojconventional tapering algorillinn. In this paper a technique to conipensate for mutual coupling in smaN linear antenna arrays is described. The method consist of calculations of a coupling matrix, which is than used to compensate for the effects of mutual coupling. Two dfferent meth0d.v of the calculation oj'couplbig coe,$cients between the array elenlentv are presented. In order to validate the methods, measured data for a small linear antenna array is presented and discussed.

measured results in [4] indicates good agreement and illustrates the validity of our procedure. CONCLUSIONThe main quasi-static parameters of a microstrip line with a finite-width ground plane and, eventually, dielectric substrate have been calculated by using the conformal mapping method (CMM) and a new formulated method of moving perfect electric wall (MPEW). Good agreement with other solution methods has been achieved. The presented method is simpler and provides a clear analytical review of the effect of geometrical dimensions on the electrical parameters of a microstrip. Our procedure is also wellsuited for microstrip CAD systems.

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