Yinqin Cheng

Transmission properties of pillowy groove guide for millimeter waves

In this paper, a new type of pillowy groove guide is presented for the first time. And its transmission characteristics, such as cut-off and dispersion characteristics, are gotten and discussed. The obtained results are of important application values in theoretical studies and practical applications of groove guide for millimeter waves.

Analysis of multiple layer dielectric loaded circular ridge waveguide

By using edge element method, the transmission characteristics of the multiple layer dielectric loaded circular ridge waveguide have been studied in this paper. Variations of the cutoff wavelength and single-mode bandwidth with the ridge dimensions for different values of dielectric constant have been investigated in detail. Further more, the field patterns of the waveguide also have been presented. It is shown that the waveguide would gain a higher single mode bandwidth as the distance of the ridges is closer.

New study on arbitrarily V-shaped groove guide

The V-shaped groove guide with arbitrary cross-section has been studied with method of moment. The cut-off and dispersion properties of the dominant mode have been obtained and discussed. It is of important values in theoretical studies and practical engineering applications of arbitrarily V-shaped groove guide for millimeter waves.

Dispersion characteristics of dielectric loaded circular quadruple-ridged waveguide

This paper presents a numerical study of the electromagnetic wave propagation in dielectric loaded circular quadruple-ridged waveguide (CQRW) by the edge element method. The variations of the cut-off wavelength and single-mode bandwidth with the ridge dimensions for different values of dielectric constant are studied in detail. The numerical results in this paper provide an extension to the design for the ridge waveguide and are helpful in practical applications for millimeter waves.

Bandwidth properties of pillowy groove waveguide with moment methods

Firstly, the geometric model of novel pillowy groove guide was described. Secondly, the pillowy groove guide has been analyzed with method of moment. And the characteristic equation of pillowy groove guide has been gotten. At last, its dominant mode bandwidth properties has been obtained. And the bandwidth characteristics of its dominant mode along with the geometric dimensions a, d, c and the deformation factor e have been discussed in details. The obtained results are of important application values for enriching guide theory and designing performances of groove guides in practical engineering problems. It is also of important values in theoretical studies and practical engineering applications of pillowy groove guide for millimeter waves.

Study of multiple layer dielectric loaded elliptical ridge waveguide by edge finite element method

A new kind of multiple layer dielectric loaded elliptical ridge waveguide is presented in this paper. Variations of the cutoff wavelength and single-mode bandwidth with the ridge dimensions for different values of dielectric constant have been investigated in detail by using edge element method. The field patterns of the waveguide also have been presented. The results will be of practical significance in designing ridge waveguide components in microwave and millimeter wave engineering.

Unsplit-field perfectly matched layer implementation for FETD in dispersive media

The scattering of target in dispersive soil is simulated under Gaussian pulse excitation. 2D PML perfectly matched layer (PML) absorbing boundary condition is proposed to truncate computation space for finite-element time-domain (FETD) in dispersive media. Numerical examples show that the proposed PML-FETD approach has small reflection errors and no late-time instability for simulations. The PML formulations for Debye dispersive are derived. The scattering results excited by Gaussian pulse are calculated. The numerical results of vector and nodal based finite-element time-domain with PML are compared with finite-difference time-domain. Good agreement is observed.