Planar Ultrathin Small Beam-Switching Antenna

Abstract

Abstract-A novel planar ultra-thin electronically steerable parasitic array radiator (ESPAR) is presented in this paper. Through theoretical analysis of the electric fields of orthogonally crossed dipoles in phase quadrature, it is found that the crossed dipoles radiate linearly polarized (LP) wave with a rotational electric field in the azimuth plane. This characteristic is then utilized to design a planar crossed dipole ESPAR, termed as "CD-ESPAR". Furthermore, a simple but effective impedance matching method is also proposed and analyzed. To verify these concepts, a prototype with compact size and very low profile (0.42 0.42 0.006 ) resonating at 2.3GHz is designed, fabricated and measured. The measured results indicate that the proposed antenna achieves more than 17.8% impedance bandwidth and can produce four directional beams, covering the whole azimuth plane. Owing to its planar ultra-thin structure, compact size, electronically beam-switching ability, low power and low cost characteristics, it is promising for applications in wireless communications.

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