For this purpose,an oversized imperfect periodically loaded rectangular waveguide is proposed,and surface impedance approximation is adopted to formulate the problem.

This paper analyzed the propagation charactersitics of radio waves in imperfect surface chasm along railway with the concepts of waveguide theory and surface impedance.

When the electric dimension of the cylinder is large and the thickness of the dielectric layer is small, a simple form of surface impedance of the cylinder is obtained.

Using the periodical surface′s character of band gap and impedance transition of electromagnetic crystal structure such as photonic band gap(PBG),frequency selection surface(FSS),high impedance surface(HIS) and so on,the varactor diode was put onto the approximate HIS′s surface to join each cell of metal on top layer to realize the electronic control for periodical structure.

When the metal plate of high impedance surface has the same shape and almost equal dimension with the patch antenna,the gain of patch antenna or antenna array can increase largely due to the resonant effect.

Theoretical modeling and analysis of high impedance surface and their application.

In Reference [l],the surface impedance method based on two scalarmagnetic potentials is presented by the authors.