用单极子阵列天线实现近场区电磁场调控
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摘要
为了实现对阵列天线内部近场区域电磁场的控制,设计制作了一款工作频率为2.45GHz的低成本环形印刷单极子阵列天线。通过在需要加强电磁场预先设置的特定曲线上排布辅助偶极子天线阵列,利用两个阵列之间的功率传输效率最大化理论,得到印刷单极子天线阵列所需的最优化激励分布。基于上述方法,阵列天线近场区域的电磁场可以被调控成由预置曲线指定的任意不同形状。验证了电磁场分别被赋形为正方形、圆形和L形时的3种情况。
In order to realize the control of electromagnetic(EM)fields in near-field region,a low cost quadrilateral printed monopole antenna array operating at 2.45 GHz was designed and fabricated.By arranging an auxiliary dipole antenna array along apreset curve where the EM fields need to be strengthened,the optimal excitations required by the monopole antenna array can be evaluated under the condition that the power transmission efficiency between the two arrays is maximized.In this manner,the EM fields can be regulated into any desired shapes specified by the curve.Three design examples are presented to validate the method,in which the EM fields are shaped into a square,a circle,and a capital letter L respectively.
In order to realize the control of electromagnetic(EM)fields in near-field region,a low cost quadrilateral printed monopole antenna array operating at 2.45 GHz was designed and fabricated.By arranging an auxiliary dipole antenna array along apreset curve where the EM fields need to be strengthened,the optimal excitations required by the monopole antenna array can be evaluated under the condition that the power transmission efficiency between the two arrays is maximized.In this manner,the EM fields can be regulated into any desired shapes specified by the curve.Three design examples are presented to validate the method,in which the EM fields are shaped into a square,a circle,and a capital letter L respectively.
引文
[1]PENDRY J B, SCHURIG D, SMITH D R.Controlling Electromagnetic Fields[J].Science,2006,312(5781):1780-1782.
[2]ELMER M,JEFFS B D,WARNICK K F,et al.Beamformer Design Methods for Radio Astronomical Phased Array Feeds[J].IEEE Trans on Antennas and Propagation,2012,60(2):903-914.
[3]NEPA P,BUFFI A,MICHEL A,et al.Technologies for Near-Field Focused Microwave Antennas[J].International Journal of Antennas and Propagation,2017,2017[7694281]:1-17.
[4]SEN R,JEROME-SURENDRAN T,TRIVEDI D,et al.Generalised Method of Current Excitation Reconstruction from Near-Field Data of Planar,Cylindrical and Spherical Antenna Arrays[J].IET Microwaves,Antennas and Propagation,2013,7(14):1128-1136.
[5]RAHMAT-SAMII Y, MICHIELSSEN E.Electromagnetic Optimization by Genetic Algorithms[M].New York:Wiley,1999.
[6]CHOU H T,LEE M Y,YU C T.Subsystem of Phased Array Antennas with Adaptive Beam Steering in the NearField RFID Applications[J].IEEE Antennas and Wireless Propagation Letters,2015,14:1746-1749.
[7]CHOU H T,WANG N N,CHOU H H,et al.An Effective Synthesis of Planar Array Antennas for Producing Near-Field Contoured Patterns[J].IEEE Trans on Antennas and Propagation,2011,59(9):3224-3233.
[8]ZHAO Deshuang,ZHU Min.Generating Microwave Spatial Fields with Arbitrary Patterns[J].IEEE Antennas and Wireless Propagation Letters,2016,15:1739-1742.
[9]WEN Geyi.Foundations of Applied Electrodynamics[M].New York:Wiley,2010:273-275.
[10]WEN Geyi.Foundations for Radio Frequency Engineering[M].Singapore:World Scientific,2015:410-420.
[11]HE Xiaoping,WEN Geyi,WANG Shenyun.A Hexagonal Focused Array for Microwave Hyperthermia:Optimal Design and Experiment[J].IEEE Antennas and Wireless Propagation Letters,2016,15:56-59.
[12]TONG Haoping, WEN Geyi.Optimal Design of Smart Antenna Systems for Handheld Devices[J].IET Microwaves,Antennas and Propagation,2016,10(6):617-623.
[13]CAI Xiao, WEN Geyi,SUN Hucheng.A New Printed Dipole Array with High Gain and Endfire Radiation[J].IEEE Antennas and Wireless Propagation Letters,2017,16:1512-1515.
[14]YANG Xiaodong,WEN Geyi,SUN Hucheng.Optimum Design of Wireless Power Transmission System Using Microstrip Patch Antenna Arrays[J].IEEE Antennas and Wireless Propagation Letters,2017,16:1824-1827.
[2]ELMER M,JEFFS B D,WARNICK K F,et al.Beamformer Design Methods for Radio Astronomical Phased Array Feeds[J].IEEE Trans on Antennas and Propagation,2012,60(2):903-914.
[3]NEPA P,BUFFI A,MICHEL A,et al.Technologies for Near-Field Focused Microwave Antennas[J].International Journal of Antennas and Propagation,2017,2017[7694281]:1-17.
[4]SEN R,JEROME-SURENDRAN T,TRIVEDI D,et al.Generalised Method of Current Excitation Reconstruction from Near-Field Data of Planar,Cylindrical and Spherical Antenna Arrays[J].IET Microwaves,Antennas and Propagation,2013,7(14):1128-1136.
[5]RAHMAT-SAMII Y, MICHIELSSEN E.Electromagnetic Optimization by Genetic Algorithms[M].New York:Wiley,1999.
[6]CHOU H T,LEE M Y,YU C T.Subsystem of Phased Array Antennas with Adaptive Beam Steering in the NearField RFID Applications[J].IEEE Antennas and Wireless Propagation Letters,2015,14:1746-1749.
[7]CHOU H T,WANG N N,CHOU H H,et al.An Effective Synthesis of Planar Array Antennas for Producing Near-Field Contoured Patterns[J].IEEE Trans on Antennas and Propagation,2011,59(9):3224-3233.
[8]ZHAO Deshuang,ZHU Min.Generating Microwave Spatial Fields with Arbitrary Patterns[J].IEEE Antennas and Wireless Propagation Letters,2016,15:1739-1742.
[9]WEN Geyi.Foundations of Applied Electrodynamics[M].New York:Wiley,2010:273-275.
[10]WEN Geyi.Foundations for Radio Frequency Engineering[M].Singapore:World Scientific,2015:410-420.
[11]HE Xiaoping,WEN Geyi,WANG Shenyun.A Hexagonal Focused Array for Microwave Hyperthermia:Optimal Design and Experiment[J].IEEE Antennas and Wireless Propagation Letters,2016,15:56-59.
[12]TONG Haoping, WEN Geyi.Optimal Design of Smart Antenna Systems for Handheld Devices[J].IET Microwaves,Antennas and Propagation,2016,10(6):617-623.
[13]CAI Xiao, WEN Geyi,SUN Hucheng.A New Printed Dipole Array with High Gain and Endfire Radiation[J].IEEE Antennas and Wireless Propagation Letters,2017,16:1512-1515.
[14]YANG Xiaodong,WEN Geyi,SUN Hucheng.Optimum Design of Wireless Power Transmission System Using Microstrip Patch Antenna Arrays[J].IEEE Antennas and Wireless Propagation Letters,2017,16:1824-1827.