Measurement of 15 GHz beam adjustable microstrip antenna arrays with a variable short stub and with a varactor diode

This paper presents measured performance of 15 GHz beam adjustable microstrip antenna arrays (BA-MSAAs). The BA-MSAA consists of a central patch element fed by a feeding line and two parasitic patches with a variable reactance circuit (VRC) adjacent to the center patch. Radiation pattern of the BA-MSAA is controlled by reactance values of the VRCs. In order to evaluate beam-shaping performance of the BA-MSAA in 15 GHz, the BA-MSAA with square patch elements and two types of the VRCs, with a variable short stub (VSS) and with a varactor diode, are designed and fabricated. In this paper, performances of the VRCs with the VSS and the varactor are measured. Then, beam-shaping performance of the BA-MSAAs with the two types of the VRCs using the VSS and the varactor diode is presented in 15 GHz.