Abstract
This paper proposes a wide-angle beam scanning leaky-wave antenna (LWA) fed by a novel spoof surface plasmon polaritons (SSPP) transmission line (TL). In the proposed LWA, circular metallic patches are periodically loaded on both sides of the SSPP TL alternately, and convert guided waves into radiating waves. The transmission characteristics of the proposed SSPP TL are analyzed, and the transmission characteristics and radiation patterns of the proposed LWA are simulated and measured. The simulated and measured results show that the proposed LWA provides approximately 12.5 dBi of radiation gain within a frequency range of 8–24 GHz, and a beam scanning range of 90° from forward to backward continuously by increasing the feeding frequency. The proposed LWA, based on a novel SSPP TL, has advantages of single-layer conductor, continuous wide-angle beam scanning, and high gain especially at the broadside direction, which are difficult realize using conventional LWAs.
Highlights
Leaky-wave antennas (LWAs) have attracted significant attention in microwave engineering due to their advantages of simple feeding network, frequency beam scanning, high directivity and low cost [1]
Because a fast wave transmission line (TL) can feed a LWA to radiate, the initial design of LWAs are based on the waveguides supporting fast wave modes, such as slotted rectangular waveguides [2]
Many periodic structures operating on space harmonic waves are explored to feed LWAs, such as microstrip lines, groove waveguides and metamaterials structures [4,5,6]
Summary
Leaky-wave antennas (LWAs) have attracted significant attention in microwave engineering due to their advantages of simple feeding network, frequency beam scanning, high directivity and low cost [1]. Many periodic structures operating on space harmonic waves are explored to feed LWAs, such as microstrip lines, groove waveguides and metamaterials structures [4,5,6]. The spoof surface plasmon polaritons (SSPP) TL is a single-conductor line without ground plane. Since it confines the electromagnetic wave strongly around the interface between the metal and dielectric, the SSPP TL performs well in the integrated planar circuit system [7]. We propose a wide-angle beam scanning scanning LWA fed by a novel SSPP TL which is grooved by rectangular slots in a metallic strip.
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