An artificial magnetic conductor(AMC)chessboard reflector is designed which shows low backscattered radar cross sections(RCS)in a broad frequency band in this paper.Designed by the phase cancellation principle,a conve...An artificial magnetic conductor(AMC)chessboard reflector is designed which shows low backscattered radar cross sections(RCS)in a broad frequency band in this paper.Designed by the phase cancellation principle,a conventional chessboard low RCS metasurface can be formed by polarization-dependent mushroom-shaped AMCs.Two new features are added to this design based on the conventional chessboard metasurface.Firstly,the long edge of the metallic patch on the AMC element is concave to obtain a broader bandwidth.Then,the width of the patch in each AMC block is tapered in one direction to further extend the operating bandwidth for RCS reduction.The backscattered RCS of the tapered AMC reflector is numerically investigated and compared with a non-tapered one.It is found that by introducing the above features,an RCS reduction greater than 10.dB can be obtained by the reflectors with relative bandwidth of 46%in the X-band.展开更多
提出了一种新型的紧凑型交互嵌入式人工磁导体（IE—AMC：inter—embedded artificial magnetic conductor）结构。用有限元方法分析了其反射相位特性及表面波传输特性。结果表明，对于同样的单元尺寸，这种结构可以使AMC结构的谐振频...提出了一种新型的紧凑型交互嵌入式人工磁导体（IE—AMC：inter—embedded artificial magnetic conductor）结构。用有限元方法分析了其反射相位特性及表面波传输特性。结果表明，对于同样的单元尺寸，这种结构可以使AMC结构的谐振频率降低超过70％。换句话说，设计具有同样谐振频率的AMC结构单元，使用这种结构的单元尺寸仅为普通结构的30～40％左右。这使得仅用双层结构就可以实现可用于低频无线通信波段的AMC结构。同时在实际的微波集成电路及天线阵应用中，有限的空间内可以使用更多的AMC结构单元，从而使电路及天线阵的性能得到更大的提高。展开更多
基金National Key R&D Program of China(2017YFB0202500)the National Natural Science Foundation of China(61601023U1730102)。
文摘An artificial magnetic conductor(AMC)chessboard reflector is designed which shows low backscattered radar cross sections(RCS)in a broad frequency band in this paper.Designed by the phase cancellation principle,a conventional chessboard low RCS metasurface can be formed by polarization-dependent mushroom-shaped AMCs.Two new features are added to this design based on the conventional chessboard metasurface.Firstly,the long edge of the metallic patch on the AMC element is concave to obtain a broader bandwidth.Then,the width of the patch in each AMC block is tapered in one direction to further extend the operating bandwidth for RCS reduction.The backscattered RCS of the tapered AMC reflector is numerically investigated and compared with a non-tapered one.It is found that by introducing the above features,an RCS reduction greater than 10.dB can be obtained by the reflectors with relative bandwidth of 46%in the X-band.
文摘提出了一种新型的紧凑型交互嵌入式人工磁导体（IE—AMC：inter—embedded artificial magnetic conductor）结构。用有限元方法分析了其反射相位特性及表面波传输特性。结果表明，对于同样的单元尺寸，这种结构可以使AMC结构的谐振频率降低超过70％。换句话说，设计具有同样谐振频率的AMC结构单元，使用这种结构的单元尺寸仅为普通结构的30～40％左右。这使得仅用双层结构就可以实现可用于低频无线通信波段的AMC结构。同时在实际的微波集成电路及天线阵应用中，有限的空间内可以使用更多的AMC结构单元，从而使电路及天线阵的性能得到更大的提高。
