Inspired by the design philosophy of information metasurfaces based on the digital coding concept,a pla-nar 4-bit reconfigurable antenna array with low profile of 0.15λ0(where λ0 is the free-space wavelength)is presented.The array is based on a digital coding radiation element consisting of a 1-bit magnetoelectric(ME)dipole and a miniaturized reflection-type phase shifter(RTPS).The proposed 1-bit ME dipole can provide two digital states of"0"and"1"(with 0° and 180° phase responses)over a wide frequency band by individually exciting its two symmetrical feeding ports.The designed RTPS is able to realize a relative phase shift of 173°.By digitally quantizing its phase in the range of 157.5°,additional eight digital states at intervals of 22.5° are obtained.To achieve low sidelobe levels,a 1:16 power divider based on the Taylor line source method is employed to feed the array.A prototype of the proposed 4-bit antenna array has been fabricated and tested,and the experimental results are in good agreement with the simulations.Scanning beams within a±45° range were measured with a maximum realized gain of 13.4 dBi at 12 GHz.The sidelobe and cross-polarization levels are below-14.3 and-23.0 dB,respectively.Furthermore,the beam pointing error is within 0.8°,and the 3 dB gain bandwidth of the broadside beam is 25％.Due to its outstanding performance,the array holds potential for significant applications in radar and wireless communication systems.

Zheng Xing Wang;Hanqing Yang;Ruiwen Shao;Jun Wei Wu;Guobiao Liu;Feng Zhai;Qiang Cheng;Tie Jun Cui

State Key Laboratory of Millimeter Waves,School of Information Science and Engineering,Southeast University,Nanjing 210096,China;The Institute of Electromagnetic Space,Southeast University,Nanjing 210096,China

工程（英文）

[1]Zheng Xing Wang;Hanqing Yang;Ruiwen Shao;Jun Wei Wu;Guobiao Liu;Feng Zhai;Qiang Cheng;Tie Jun Cui-.A Planar 4-Bit Reconfigurable Antenna Array Based on the Design Philosophy of Information Metasurfaces)[J].工程（英文）,2022(10):64-74

RTPS,quantizing

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