Abstract
A 1-bit digital reconfigurable reflective metasurface (RRM) with 20 × 20 cells is presented, fabricated and measured for beam-scanning performance in this paper. The cell is designed with a single layer structure and one varactor diode, controlled electronically. The cell’s phase compensation is over 180° between 3 GHz and 4 GHz and the two states with 180° phase difference are selected as coding “0” and coding “1”. By the fuzzy quantification theory, all the elements on the RRM are set to be coding “0” or coding “1” according to the phase compensation calculated by MATLAB. Furthermore, by changing the coding of the RRM, it can achieve beam-scanning. The simulation results show that the beam-scanning range is over ±60°. The RRM prototype is fabricated and experimentally tested for principle. The gain of the RRM is 18 dB and the 3 dB bandwidth is about 16.6%. The 1-bit digital RRM is preferred in practical implementations due to less error and much easier bias voltage control. The proposed RRM successfully balances the performance and system complexity, especially in the large-scale antenna designs. The experimental and simulated results are in good agreement to prove the correctness and feasibility of the design of the 1-bit digital RRM.
Highlights
Due to its hybrid phased array and parabolic reflector array, reconfigurable reflective metasurface (RRM) has attracted a great deal of attention and interest recently [1]
The 1-bit digital RRM can achieve the beam-scanning. This demonstrates that the beam-scanning performance can be achieved by controlling the coding of the RRM
The measurement results are in good agreement with the simulation results, which shows that the design of the 1-bit digital RRM is effective
Summary
Due to its hybrid phased array and parabolic reflector array, reconfigurable reflective metasurface (RRM) has attracted a great deal of attention and interest recently [1]. PIN diode is adopted to design a metasurface element [3,5,6]. Since the PIN diode only works at one frequency at two states, ON and OFF, the bandwidth of the reconfigurable reflective metasurface is very narrow. The element may not be appropriate to design the reflective metasurface [7,8]. The element with varactor diode can work at different frequencies by controlling the bias voltage across the varactor. As a result, it has more potential applications since it can work in a wider bandwidth [9,10,11]
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