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This paper presents a study of the effect of losses in slotted substrate-integrated-waveguides by means of a rigorous numerical approach consisting in a mode matching coupled with a method of moments. Losses can be due to the conducting plates shielding the structure and to dielectrics inside the waveguide (both in the substrate and in dielectric posts). The first effect is modeled through an effective...
Spectral domain immittance functions can be used to numerically solve for the unknown surface currents on printed dipoles in layered anisotropic dielectrics. This solution requires the use of the spectral domain moment method and numerical integration. This paper presents a hybrid polar- and rectangular-numerical integration technique on the α-β plane useful for efficient evaluation of the spectral...
A method of moments model is presented to analyze Archimedean spirals that are printed on a layered dielectric sphere. The model is derived assuming an arbitrary location of the spiral. Input impedance, current distribution and far-field results are presented and are shown to be in good agreements with other methods.
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