Abstract
This paper presents a novel center-fed leaky-wave antenna (LWA) with a broad beam-scanning range. Different from the traditional LWA with a single beam, the proposed LWA consists of a magic-T for providing an out-of-phase equal-amplitude excitation and a periodic LWA array based on substrate integrated waveguide (SIW) for radiation. A dual-beam antenna supporting a wide-scanning range through the broadside without the open stopband suppression can be realized. It should be noted that only the backward radiation beams are used in the design. A broad bandwidth of 27.7% (22.14-29.25 GHz) is achieved, according to the simulation findings. Moreover, the simulated radiation patterns illustrate that a wide range of beam scanning around +/- 75 degrees including broadside direction is achieved by the proposed antenna. With its broad operating frequency band and wide-scanning angle, the proposed design shows promise for varies applications.