A fixed-frequency Beam-Scanning Leaky-Wave Antenna Base on Phase and Amplitude Control

Abstract

A novel fixed-frequency beams canning leaky-wave antenna (LWA) based on dual control of amplitude and phase is proposed. The antenna adopts a gap wave waveguide (GGW) as the basic transmission structure and consists of SO patch elements. Each patch is excited by a pair of symmetrical H-shaped slots. By changing the bias voltage of the PIN diodes straddling the slot, the different states of the unit can realize. The units provide different phase compensations to create phase perturbation on the aperture, in order to radiate beam. For the purpose of optimizing the sidelobe level (SLL), amplitude control is introduced. The fabricated antennas exhibit good characteristics in terms of both realized gain and scanning angle.