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This letter presents a technique to evaluate the Green's functions of rectangular cavities around resonant frequencies. It is well known that, lossless cavities' Green's functions are singular at discrete resonant frequencies hence cannot be numerically evaluated directly. In this letter, the singular terms are first explicitly separated from the Green's functions, and then a bases rearrangement method...
In this paper, a novel slot antenna is designed for ground penetrating radars (GPRs). The novel antenna consists of an array of cavity backed slot elements. Compared to microstrip patches, slot antennas have a few attractive advantages, such as ease in achieving relatively larger fractional bandwidth, minimal mutual coupling between array elements, less sensitivity to substrate truncation, and higher...
In this paper, a theoretical analysis is presented for the numerical scheme in [Lu, 20007]. It is shown that the numerical difficulties associated with cavity Greenpsilas functions around resonances originate from the non-unique solutions within fully-enclosed lossless cavities. As a result, conventional integral equations are not well-posed around cavitiespsila resonant frequencies, and modified...
In this paper, a technique is proposed to numerically remove the singularities through re-arrangement of discrete unknowns, so that MOM yields correct results for all frequencies. This technique is presented using rectangular cavity backed slot (CBS) antennas as examples, and validated by experimental data.
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