Abstract
In this paper, a titled-beam antenna based on spoof surface plasmon polaritons (SSPPs) transmission lines (TLs) is proposed. The parallel SSPPs-TL is a slow-wave TL, which is able to limit waves in the TL strictly. By periodically introducing a set of tapered stubs along the SSPPs-TL, the backward endfire beams are formed by the surface waves in the slow-wave radiation region. Then, through the placement of a big metal plate below the endfire antenna, the backward endfire beams are tilted, and the tilted angle of the beams are steered by the distance of the metal plate and antenna. Over the band of 5.7 GHz~7.0 GHz, the tilted antenna performs constant shapes of radiation patterns. The gain keeps stable at around 12 dBi and the 1-dB gain bandwidth is 20%. The measured results of the fabricated prototypes confirm the design theory and simulated results.
Highlights
Tilted-beam antennas have attracted tremendous attention in various applications [1,2], such as radar systems, RF base station, mobile communication systems, and satellite communication systems
One way to obtain endfire radiation beams is by loading a main radiator and the directors at the end of an SSPPs-transmission lines (TLs) [15], the working theory of which is similar to Yagi antenna
The backward endfire antenna consists of a set of tapered stubs periodically along the parallel SSSPPs-TL
Summary
Tilted-beam antennas have attracted tremendous attention in various applications [1,2], such as radar systems, RF base station, mobile communication systems, and satellite communication systems. One of the biggest problems of the fixed-beam LWA is the beam squint that leads to gain losses at the desired radiation direction To overcome this problem, some complementary frequency-dependent metasurfaces are proposed to cancel the dispersion of the LWA [11,12,13]. One way to obtain endfire radiation beams is by loading a main radiator and the directors at the end of an SSPPs-TL [15], the working theory of which is similar to Yagi antenna Another efficient method for endfire radiation is to excite the odd leaky mode of the dual-side corrugated-groove SSPP waveguide [16,17,18], to which the phase constant is well tailored by the corrugated grooves to achieve endfire radiation with the approximate satisfaction of the Hansen–Woodyard conditions. It does not need the complex feeding network and circuit system
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