Abstract
A beam-changeable concentric annular Leaky-Wave Antenna (LWA) array is proposed, which contains two annular LWAs with constant-interval slots. By changing the excitations of the two LWAs, the radiation beam can be changed to different shapes and in different directions i.e. single beam to normal direction, conical beam to 40° and a synthetic beam. A theoretical model for analyzing the radiation properties of the LWA array is put forward, and a prototype of the array with the radius of 42.6 mm and the height of 4 mm is fabricated. By comparing simulation and the measurement results, it is found that the proposed LWA array exhibits a very well expected performance. The proposed antenna array is then applied to construct a self-sensing smart antenna which can provide flexible radio wave coverage according to the positions of users. Image-aware function is integrated into the smart antenna, and a series of tests including received power and Error Vector Magnitude (EVM) measurements are carried out in indoor scenarios. The results verify the effectiveness of the design.
Highlights
FOR the generation of mobile communication, multibeam and beam-changeable antennas will provide flexible radio wave coverage and ensure the quality of mobile communication, which are attracting increasing attention
In [16], a smart antenna with automatic beam switching based on Frequency Modulated Continuous Wave (FMCW) is proposed, which is designed for one-dimensional radio wave coverage
In order to verify the performance of the smart antenna, a series of measurements were carried out including received power distribution and Error Vector Magnitude (EVM) measurements in a real office scenario
Summary
FOR the generation of mobile communication, multibeam and beam-changeable antennas will provide flexible radio wave coverage and ensure the quality of mobile communication, which are attracting increasing attention. In [9], a direction-changeable concentric conical beam array antenna achieved by superimposing different conical beams is proposed. In [16], a smart antenna with automatic beam switching based on Frequency Modulated Continuous Wave (FMCW) is proposed, which is designed for one-dimensional radio wave coverage. Comparing to the multi-beam antennas in [1,2,3,4,5,6,7,8,16,17] which mostly provides only directive switchable beams, this work generates multi-beams including directive beam, omnidirectional beam and synthetic beam
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