Xie Yongjun

An Accurate Mutual Coupling Calculation For Microstrip Antennas For Impedance Mismatching

An exact determination of mutual coupling between microstrip patches is presented in this paper. The classical formula for mutual coupling based on multi-port network theory is popular for determining such coupling. However, this formula ignores the impedance mismatching between antenna and its load. In this presentation an accurate formula for the coupling between patch elements is deduced. For impedance matching case the exact formula reduces to the classical formula. The simulation results show that the consideration of impedance mismatching in mutual coupling calculation is very important.

On the accuracy of the plane wave expansion of Green's function for MMIC

The accuracy and convergence of the plane wave expansion for the closed-form spatial Greens function that is conventionally used for the fast multipole method (FMM) analyzing MMIC are numerically analyzed. Specifically, the number of terms kept in the multipole expansion, L, and the required quadrature point number, l/sub i/, in the Gauss quadrature are discussed in detail. The numerical results show that the convergence in some cases is poor.

Simulation on Vertical Via Interconnection Using Matrix-penciled Moment Method in Microwave Multi-Chip Module

In the multi-chip module, signal transmission lines such as striplines or microstrip lines at different layers are connected through vias. It is very important to research the characteristics of via because of the signal transmission discontinuity it induced. In this paper, the matrix-penciled moment method is applied to analyze and compute the scattering parameters of via in a multi-layered module, and some important laws of scattering characteristics of the via are obtained, and the correctness of the calculated results are demonstrated as well.

The efficient variational principle for analyzing resonant performance of hole coupled lossy cavity resonator

In this paper, the new variational principle considering the discontinuity in electromagnetic is given on the basis of the known . The academic analysis is made for resonant performance of the hole coupled lossy cavity, which shows the validity of the new variational principle. In fact, the validity of this principle is common.

Variational method to analyze the equivalent network of a rectangular dielectric post in a rectangular waveguide

The equivalent filter modeling of a rectangular dielectric post in a rectangular waveguide is obtained through the variational expression of input impedance. The reflection coefficient expressed in components of network is in good agreement with the results given by K. Siakavara, et al. (1991), The method can be applied to design filter.

Accurate variational analysis for measurement of complex dielectric constant of the sample rod inserted in a cavity

AbstractThis paper derives the Lindell formula based on the generalized variational principle. For the complex dielectric constant measurement of a small lossy dielectric rod with Rayleigh-Ritz method, an accurate variational analysis is given. The concept of complex frequency

Small circularly-polarized horn antenna

\tilde \omega

Method for AEWA (Airborne Early Warning Aircraft) radar detection target simulation

is introduced in general, and the stability of the solution is discussed. Comparing with the result of perturbation method, it is concluded that the deviation, of perturbation algorithm should be taken into consideration.