Slot Excited Dielectric Resonator Antenna Above a Cavity - Analysis and Experiment

Abstract

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 Application of Macromodels to the Analysis of a Dielectric Resonator Antenna Excited by a Cavity Backed Slot

“…Obviously, equation (5) may be solved directly using typical methods of linear algebra, as it was done, in fact, in [5] and [6]. Such a method has however the following limitations:…”

“…The time required for solving (6) in the wide frequency band could be considerably reduced if one applied fast frequency sweep techniques [11], instead of step-by-step calculations. This technique can be easily applied to the "upper" part of the problem (i.e.…”

“…The procedure outlined in the previous section has been applied to the analysis of the rectangular DRA, which was earlier analysed using the classical approach (the results of calculation and measurements were published by the authors in [6]). …”

“…Fig. 4 The structure and dimensions of the cavity backed, slot excited DRA used for comparisons [6]. V. CONCLUSION In the paper, we have presented an efficient method for speed-up the analysis of slot excited dielectric resonator antennas.…”

“…Usually, the feeding system is made in microstrip technology [4], and is placed below the ground, possibly in a metal cavity, in order to suppress electromagnetic coupling with other microwave devices. Such a structure can be rigorously analysed with the use of the IE-MoM approach, as it was already demonstrated by the authors, for example, in [5] and [6]. In such a case, the IE-MoM approach involves modelling both the DRA and the feeding system embedded inside the cavity.…”