Abstract
In this paper, a substrate integrated waveguide (SIW) periodic leaky-wave antenna with both wide beam-scanning range and rapid scanning rate characteristics is proposed. By employing substrate with high dielectric constant and the longitudinal slot with impedance matching post, a wide beam-scanning angle through broadside is obtained. In addition, by adjusting the longitudinal slot and the dipole element in each unit cell, the slope of phase constant curve can be greatly increased, resulting in a relative high scanning rate more than four degrees per percentage bandwidth. The simulated results show that a continuous beam scanning from -46.12° to +33.76° within the operating band (24.4–30.4GHz) is achieved. Moreover, a rapid scanning rate of 3.65° per percent bandwidth and stable gain are observed over the entire operating band.
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