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In this paper a new ridge gap waveguide working in 3.5–5GHz has been designed. It is excited by coaxial line transition. In the beginning, this paper simply describes the basic principle related to electromagnetic band-gap (EBG) or artificial magnetic conductor (AMC) to explain why only local quasi-TEM modes can propagate in the designed waveguide. The principle performance of the ridge gap waveguide...
This work presents theory and simulation of a method to solve the divergent problem of multiples of one-half wavelength. It is theoretically shown that, by using the special relationship between the electromagnetic parameters of the sample to be tested and of the known material, the divergent problem of multiples of one-half wavelength can be avoided. Simulation results show that the divergent problem...
In the present work a method is proposed which enables accurate and effective reliability tests of impedance measurement of tag antenna directly by extracting S parameters from the double coaxial test device. The experimental and simulated impedance of tag antenna are presented in this paper, under the condition of UHF Passive tag and long-distance RFID system and the working frequency of the antenna...
A high gain circular polarized radial line slot antenna (CP-RLSA) is reported in the design with Mat lab and HFSS interface technology to achieve the slot array model modified adjusted automation. In this paper, we find that proper adjustment of the frequency offset can get a higher gain and a lower return loss. A new material with the relative dielectric permittivity of 1.06 can help to reach the...
A radial line slot antenna (RLSA) is a high gain and high efficiency planar antenna. Owing to the fact that thousands of slots are on the surface of the antenna, the simulation data is very large and the time required is longer. Therefore, a sectorial cavity with a periodic boundary condition is used to simulate a sector region of the circular aperture in a CP-RLSA. This analysis provides the basic...
An electromagnetic parameter extraction method using SVM (Support Vector Machines) and open-ended rectangular waveguide, is established in this paper. A lot of S parameters, which are used to train the SVM, are calculated from the finite element models. After being trained, the SVM is used to predict the permittivity of the material using the known scattering coefficients. The simulation results show...
A new method of determining permittivity by SVM is studied in this paper. The mapping relationship between the S parameters and the permittivity is set up by calculating a large number of S parameters from the samples with different permittivity using waveguide theory. The simulated data set is used as training data set for SVM. After being trained, the SVM is used to predict the permittivity of material...
The method extracting the electromagnetic parameters from scattering coefficients was studied in this paper. The Support Vector Machine (SVM) method is used to solve the inverse problem of parameters extraction. The mapping relationship is set up by calculating a large number of S parameters from the samples with different permittivity by using transmission line theory. The simulated data set is used...
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