Abstract
Leaky-wave antenna (LWA) is known as a type of traveling antenna with dispersive frequency responses, which has found important applications in modern communication, imaging, and radar systems. The beam scanning rate is a key consideration in some applications since it can minimize the bandwidth requirement of the system, during the scanning in broad angular regions. However, the sweeping linearity, namely the scanning angular range per unit frequency, is seldom considered at the same time in the published literature. In this article, we propose a waveguide-type LWA working from 11.1 to 12 GHz. By loading periodical pins with glide symmetry in the waveguide, it is possible to manipulate the dispersion properties of the fast wave mode, hereby giving rise to a good balance between the scanning rate and the sweeping linearity. This scenario has been validated by numerical simulation and experiment with excellent agreement. The measurement results reveal that the scanning angles have been increased to a range from 16.7°~67.5° varying the frequency from 11.1 to 12.1 GHz. The relative average scanning rate is enhanced up to 589.3°, with high sweeping linearity.
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