Abstract: The parallel corner-fed square microstrip antenna is studied. A method of analysis of input impedance properties is developed, and the closed-form expressions are derived. The Multiport network model, the cavity theory, the segmentation technique and the desegmentation technique are combined in the present approach. The characteristics of parallel corner-fed structure are fully included in the method. For antenna design, more accurate results can be conveniently obtained from it than those from the cavity theory. The experimental results validate the theory.

Key words: multiport network model, parallel corner-fed microstrip antenna, segmentation technique, desegmentation technique