The Pattern Reconfigurable Array Design for Lens Feeding

Abstract

Pattern reconfigurable technology can change the shape or beam direction of the antenna radiation pattern. The application of pattern reconfigurable antenna based on reconfigurable network is proposed in this paper, which designs a two-element and a four-element reconfigurable antenna array. The element of the array is composed of a cross-placed dipole, which the S <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> is below −15 dB at 1.67 GHz–2.7 GHz with the bandwidth of 45%, and the isolation $S_{12}\lt -21 \mathrm{dB}$ in that bandwidth. In the array, the element is integrated with reconfigurable network by controlling the on/off states of the PIN diodes. There are three states for the two-element array and eight states for the four-element array. The S <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> of the antenna is less than -10 dB between 1.7 GHz–2.7 GHz. The pattern reconfigurable antenna array is used as the feed of the plane luneberg lens in this paper, which realizes beam scanning. The two-element reconfigurable feed can realize 3 beam scanning with coverage of ±10°, and the four-element reconfigurable feed can realize 7 beam scanning, from large to small scanning angles are 32°, 19°, 10°, 0°, −10°, −19° and −32°, can achieve beam coverage from −32° to +32°. The two groups of reconfigurable antenna arrays designed in this paper are applied to a plane luneberg lens as the feed, with the location of elements changed, the beam direction changes. The reconfigurable antenna array is used as the lens feed, which simplifies the design of the feed and has high application value.