Abstract
ABSTRACT: Frequency dependence of phase reflection coefficient of a microstrip periodic gratingof undulated strips is numerically investigated by means of the method of moments. The possibility of using of such structure as a high-impedance surface is shown. The influence of change in shape of the strips and in the parameters of dielectric substrate on the frequency characteristics of the grating is analyzed for the case on normal incidence of a plane electromagnetic wave. The possibility of electronic control of the grating characteristics is demonstrated. INTRODUCTION As is known, at normal reflection of a plane electromagnetic wave by perfectly conductive metal plane the vectors of the incident and reflected electric field strength have the same values but opposite directions on this plane owing to equality to zero of the strength of the total electric field E G in a perfect conductor. Therefore the reflection coefficient of such plane (which is called also “electric wall”) is equal to –1, and the surface impedance, as follows from its definition
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