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In this article, an application of the asymptotic waveform evaluation technique to accelerate wideband scattering analysis by lossless dielectric objects is given. The solution is based on the volume integral equation together with the method‐of‐moments. Computational examples for so‐called bodies‐of‐revolution are given. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1028–1031, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22326

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.

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Fig. 5. Comparison of the full-wave simulated patterns and the measured patterns in [10]: (a) f (1.56 GHz). (b) f + prf and f + 2prf. to the measured SLL of about 028:32 dB. Fig. 5(b) shows the full-wave simulated sideband patterns at the first and second sidebands, in comparison with the measured results in [10]. The simulated peak sideband levels are 012:19 and 017:81 dB at the first and second sidebands, close to the measured levels of 013:09 and 021:05 dB in [10], respectively. In general, the full-wave simulated sideband patterns are in reasonable agreement with the measured sideband patterns in [10]. IV. CONCLUSIONIn this communication, we have proposed a frequency-domain full wave approach to simulate the TM linear antenna arrays. By decomposing the time-domain excitations into frequency-domain amplitude and phase excitations at the central modulating frequency as well as the sideband frequencies, the TM linear arrays can be simulated using conventional frequency-domain full-wave simulation approach. Consequently, the space and frequency responses of the TM linear arrays can be obtained through combinations of the space patterns at the respective central modulating frequency and sideband frequencies. The proposed approach was applied to the full-wave simulations of L-band printed dipole TM linear arrays with VAS time modulation schemes.The full-wave simulation results are in reasonable agreement with reported measurement results, thus demonstrating the effectiveness of the proposed approach. suppression in time-modulated linear arrays by the differential evolution algorithm," "Design of a uniform amplitude time modulated linear array with optimized time sequences," IEEE Trans.Abstract-The idea of so-called macromodels is applied to problems of computational electromagnetics involving integral-equation/method-of-moments formulations. It is shown that with the use of equivalence principles, it is possible to exclude a part of the problem, calculate its wideband response without an a priori knowledge of the excitations, and then efficiently combine the result into the original situation. The idea is validated using examples involving slot-excited dielectric resonator antennas. Index Terms-Domain decomposition, integral equations, method of moments (MoM).