Pattern Reconfigurable Leaky Wave Antenna Using Liquid Material

A high-gain, beam-steerable antenna for X-band applications is presented using a waveguide structure with longitudinal slots. The proposed leaky wave antenna (LWA) is designed to resonate efficiently across the entire X-band frequency range of 8–12 GHz. A novel water-based beam steering technique is employed, where water is added to 3D-printed circular channels enclosed in a Polylactic Acid (PLA) structure placed on top of the waveguide. This setup allows for dynamic beam steering at various angles. Several prototypes, both with and without water filling, were developed and tested to achieve high gain and narrow beamwidth in both planes. The antenna demonstrates a peak gain of 19.6 dB with a pencil beam and exhibits excellent side lobe suppression. LWA full-wave simulations in CST Microwave Studio confirm good matching bandwidth over the complete X-band, with significant improvements in gain and beam control. This design offers a cost-effective and high-performance solution for radar and communication systems, representing a notable advancement in beamforming and antenna technology.