Microstrip antenna with switchable polarization

Abstract

The given work represents a study of a new variant of polarization control of microstrip antenna producing fields with linear (vertical and horizontal) and circular (with left-hand and right-hand rotation) polarization at four inputs. The structure of power supply of such antenna consists of two Wilkinson power dividers and one quadrature coupler. This design is distinguished by its compact size and excellent insulation between adjacent ports. To verify the theoretical results we made a model of printed antenna on a substrate with dielectric permittivity = 4.4 and 1-mm thickness. The antenna functions within a frequency band from 2,2 GHz to 2,6 GHz. The experimental data correspond to the theoretical data.