Joint Digital–Analog Control for Large Phase Shift Within Ultra-Wideband by Intelligent Reflector of Frequency Sensing

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Abstract
The switching or continuous operations which are digital or analog manipulations for periodic electromagnetic (EM) structures have developed rapidly to achieve sufficient designs of manipulating spatial wave. However, achieving phase control over an ultra-wideband has always remained a challenge, restricting its applications. Here, we propose a new method to realize large phase shift beyond 270 degrees with relative bandwidth of 112%, utilizing joint digital-analog control. The frame of “EM receiving - reconfigurable circuit - EM re-radiating” for designing unit cell of reflector is applied. Tightly coupled dipole is preferred to realize ultra-wideband EM receiving/re-radiating. By programmable switching four PIN diodes to control different transmission paths and continuously tuning varactors to change capacitance, large reflection phase shift within ultra-wideband can be jointly accomplished. The method of co-simulation, combining simulation results of passive EM textures with measured data of fabricated circuit, can acquire good performance of reflection phase manipulation both at phase coverage and working bandwidth. A prototype of reflector with frequency-adaptive module has been measured. The automatic and customized variation of reflection phase can be actualized without human intervention by proposed intelligent reflector according to the frequency of incident wave from 0.55 to 1.95 GHz.
Funding Information
  • National Natural Science Foundation of China (62271146)

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