Inset-Fed Triangular Antenna Array with Switchable Circular Polarization

This paper presents a triangular patch array antenna development using an inset-fed to match the impedance equipped with two switches to reconfigure the polarization. The proposed antenna array consists of four inset-fed triangular microstrip patches arranged circularly with an angular distance of 90° between patches. Two pin diodes implemented as switches are used to change the polarization of antenna array. Simulation and measurement are conducted to examine the performance of proposed configuration to generate two switchable circular polarizations, i.e., Right-Hand Circular Polarization (RHCP) and Left-Hand Circular Polarization (LHCP), at the frequency of 3.5 GHz. It shows that the antenna array has a unidirectional radiation pattern for both circular polarizations.