[1] Liu Z T. Investigations on millimeter wave multiplebeam antennas[D], 20-24(2015).

[2] Larsson E G, Edfors O, Tufvesson F et al. Massive MIMO for next generation wireless systems[J]. IEEE Communications Magazine, 52, 186-195(2014).

[3] Hong W, Jiang Z H, Yu C et al. Multibeam antenna technologies for 5G wireless communications[J]. IEEE Transactions on Antennas and Propagation, 65, 6231-6249(2017).

[4] Jiang M, Chen Z N, Zhang Y et al. Metamaterial-based thin planar lens antenna for spatial beamforming and multibeam massive MIMO[J]. IEEE Transactions on Antennas and Propagation, 65, 464-472(2017).

[5] Huo H, Yan F P, Wang W et al. Terahertz high-sensitivity sensor design based on metamaterial[J]. Chinese Journal of Lasers, 47, 0814004(2020).

[6] Zhang M, Yan F P, Du X M et al. Design and analysis of electromagnetically induced transparency in THz multiband[J]. Chinese Journal of Lasers, 48, 0314001(2021).

[7] Wang J Y, Wu Q N. Metamaterial terahertz broadband reflector with double-layer grid[J]. Chinese Journal of Lasers, 47, 0614002(2020).

[8] Li D M, Yuan S, Yang R C et al. Dynamical optical-controlled multi-state THz metamaterial absorber[J]. Acta Optica Sinica, 40, 0816001(2020).

[9] Cao S W, Zhou Y J, Cheng H F. Research progress of transformation optics lens antenna[J]. Chinese Optics, 10, 164-175(2017).

[10] Wang J J. Design of optical devices and lens antenna based on new electromagnetic materials[D], 68-120(2019).

[11] Kong F M, Wu B I, Kong J A et al. Planar focusing antenna design by using coordinate transformation technology[J]. Applied Physics Letters, 91, 253509(2007).

[12] Roberts D A, Kundtz N, Smith D R. Optical lens compression via transformation optics[J]. Optics Express, 17, 16535-16542(2009).

[13] Jiang W X, Cui T J, Ma H F et al. Cylindrical-to-plane-wave conversion via embedded optical transformation[J]. Applied Physics Letters, 92, 261903(2008).

[14] Yang Y, Zhao X M, Wang T J. Design of arbitrarily controlled multi-beam antennas via optical transformation[J]. Journal of Infrared, Millimeter, and Terahertz Waves, 30, 337-348(2009).

[15] Kundtz N, Smith D R. Extreme-angle broadband metamaterial lens[J]. Nature Materials, 9, 129-132(2010).

[16] Ma H F, Cui T J. Three-dimensional broadband and broad-angle transformation-optics lens[J]. Nature Communications, 1, 124(2010).

[17] Wu Q, Jiang Z H, Quevedo-Teruel O et al. Transformation optics inspired multibeam lens antennas for broadband directive radiation[J]. IEEE Transactions on Antennas and Propagation, 61, 5910-5922(2013).

[18] Mateo-Segura C, Dyke A, Dyke H et al. Flat Luneburg lens via transformation optics for directive antenna applications[J]. IEEE Transactions on Antennas and Propagation, 62, 1945-1953(2014).

[19] Zhu C H, Jiang Z G, Liu L J et al. A new strategy for transformation optics with index-only media[J]. IEEE Transactions on Antennas and Propagation, 67, 4626-4635(2019).

[20] Yang C F, Huang M, Zhang H Z et al. Experimental demonstration of a multi-beam antenna with full parameters based on inductor-capacitor networks[J]. Progress in Electromagnetics Research Letters, 92, 31-37(2020).