The scattering properties of the H‐plane waveguide discontinuities such as the cross junction, T‐junction, and right‐angle bend are analyzed taking their symmetry into account. the solutions are synthesized in two new and simple expressions. These solutions are treated rigorously by the mode‐matching method in which each junction section is divided by a circular region and the electro magnetic fields are matched with the scattered waves into waveguide regions at the boundaries. By means of the accurate numerical results obtained in a wide frequency range, the scattering properties of the H‐plane junctions in a standard waveguide and an oversized waveguide are examined in detail. the latter is believed to be useful for an approximnte estimation of the scattering properties of crossing roads in underground shopping centers.
Abstract|We present a precise mode-matching method for characterizing an H-plane Y-junction with an arbitrary angle in rectangular waveguides. This entails dividing the discontinuous section into ®ared and cylindrical sectors, thereby creating regions in which it is possible to locally separate the variables. The electromagnetic elds of the cylindrical coordinate system displayed in these regions and those in the continuous section are matched within hypothetical boundaries. We use those solutions to numerically assess the scattering characteristics of the dominant and higher-order modes.
Abstract:We propose an interstitial coaxial antenna that can insert without a catheter for microwave ablation therapy, operating at 2.45 GHz. The cap of the antenna is an arrowhead that bonds copper plate and ceramic plate to suppress heat conduction in the tip direction. The temperature distribution in the improved liver phantom is measured by using the infrared thermography device. As a result, it is clarified that we nearly get the spherical distribution of an assumed tumor in shape.
The paper describes microwave power absorption in a typical human being, modeled as a multilayered dielectric cylinder. Average specific absorption rate (SAR) was calculated for E- and H- polarized incident wave for different conditions of the object. Comparison with an existing method is treated, and correction of an erroneous result therein is reported.
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