A Novel Microstrip Line Based Leaky Wave Antenna using Capacitive Loading

Abstract

A novel MLWA with integrated varactor diodes is presented in this work. The design relies on integrated FPMS unit cells that can modulate the substrate properties of the antenna to provide the required radiation characteristics. The phase constant of the wave along the antenna length is varied in a controlled fashion by virtue of these unit cells to steer the maximum of the beam. At 2 GHz, and using Duroid 5880 as the substrate, the antenna provides a simulated gain of 11 dBi with beam scanning in the backward direction. A good correlation can be observed between the theory and simulations that provides confidence on this proof-of-concept design. With high gain and acceptable impedance matching, this design provides a platform for investigation of FPMS based reconfigurable antenna elements.