STUDY OF THE CAPACITIVELY FED MICROSTRIP ANTENNA ELEMENT

The moment method is used to solve the integral equations describing t he capacitively fed rectangular microstrip antenna element. This eleme nt consists of a ground plane, a radiating patch, and a small patch lo cated between ground plane and radiating patch. The small patch is fed by a coaxial probe. It excites the radiating patch through capacitive coupling. After checking the accuracy by comparing calculated and mea sured results, the effect of the capacitor patch is analyzed theoretic ally. A procedure is given to determine capacitor patches which yield elements matched to the coaxial feed. It is shown how a matched config uration can be found for a given capacitor patch height.