Abstract
In this paper, on the basis of multifunctional reconfigurable pixel antenna (RPA) elements, a novel linear sparse array with an attractive compound reconfigurability is presented. It has the potential advantages of its beam scanning with low gain fluctuation, low sidelobe in two orthogonal planes, and polarization reconfigurable performance. Specifically, an RPA with simultaneous polarization and pattern reconstruction capabilities, consisting of the driven patch and the parasitic pixels on the same layer of dielectric substrate, is firstly designed, which can work in several operation modes corresponding to steerable beam directions θ=0°;θxoz=25°, 45°;θyoz=15° with two circular polarizations in X-band. Cross-slot coupling feed is used to improve polarization reconstruction capability and reduce the complexity of hybrid reconstruction topology optimization. Then, those RPAs are integrated into the 1×8 linear sparse array to realize the reconfiguration of two circular polarizations and beam steering in xoz- and yoz-plane. Simulation results show that the gain fluctuation and sidelobe level of the array during beam scanning have significant advantages over the previous phased array, and the generation of antenna grating lobes is avoided. Moreover, both RPA element and RPA array prototypes have been fabricated and measured to testify the efficiency. The measured results agree well with the simulated ones, which indicates the application potential in the field of modern wireless communication system of the proposed linear sparse array.
Highlights
With the fast development of wireless technology rising the demand of the communication capacity, strict requirements have been raised and attached on the modern wireless communication system
To cope with the ever-increasing demand of capacity, a highgain intelligent antenna array is always expected, which is capable of steering its beam toward desired directions, while simultaneously placing nulls toward undesired directions of interferes, thereby enhancing the signal-to-noise ratio of the desired signal [3]
In order to realize the reconfiguration of array, the polarization and radiation pattern reconfigurable pixel antenna (RPA) is designed and optimized as the array element. e RPA consists of two layers, in which the parasitic layer with a grid of multisize patches is adopted as the top layer, and a metal ground with a cross gap is located between the upper and lower substrates
Summary
On the basis of multifunctional reconfigurable pixel antenna (RPA) elements, a novel linear sparse array with an attractive compound reconfigurability is presented It has the potential advantages of its beam scanning with low gain fluctuation, low sidelobe in two orthogonal planes, and polarization reconfigurable performance. Simulation results show that the gain fluctuation and sidelobe level of the array during beam scanning have significant advantages over the previous phased array, and the generation of antenna grating lobes is avoided. Both RPA element and RPA array prototypes have been fabricated and measured to testify the efficiency. Both RPA element and RPA array prototypes have been fabricated and measured to testify the efficiency. e measured results agree well with the simulated ones, which indicates the application potential in the field of modern wireless communication system of the proposed linear sparse array
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