A Broadband Monopole Antenna Enabled by an Ultrathin Anisotropic Metamaterial Coating
A Broadband Monopole Antenna Enabled by an Ultrathin Anisotropic Metamaterial Coating
复制标题
DOI：
10.1109/lawp.2011.2180503
复制
发表时间：
2011-12
影响因子：
4.2
通讯作者：
Z. Jiang;M. Gregory;D. Werner
中科院分区：
文献类型：
--
作者：
Z. Jiang;M. Gregory;D. Werner
提出了一种新型的、结构紧凑的柔性各向异性超材料（MM）涂层，该涂层可将四分之一波长反射器的阻抗带宽提高到一个倍频程以上。MM涂层对于沿着方向取向的张量分量具有高的有效介电常数。通过适当地选择MM涂层的半径和张量参数，可以有效地激发更高频率的另一个共振，而不影响谐振子的基模。此外，在两个谐振点上，晶体管上类似的电流分布使得在整个频带上稳定的辐射模式成为可能。为了实验验证这一概念，设计、制造和表征了S波段MM涂层微带，其带宽为2.14：1（2.15-4.6 GHz），VSWR小于2：1。所展示的MM涂层具有仅λ/24的半径和极轻的重量，这使得它在宽带阵列和便携式无线设备等应用中具有吸引力。
A new type of compact flexible anisotropic metamaterial (MM) coating is proposed, which greatly enhances the impedance bandwidth of a quarter-wave monopole to over an octave. The MM coating has a high effective permittivity for the tensor component oriented along the direction of the monopole. By properly choosing the radius and tensor parameter of the MM coating, another resonance at a higher frequency can be efficiently excited without affecting the fundamental mode of the monopole. Additionally, the similar current distributions on the monopole at both resonances make stable radiation patterns possible over the entire band. To experimentally verify the concept, an S-band MM coated monopole was designed, fabricated, and characterized, exhibiting a 2.14:1 bandwidth (2.15-4.6 GHz) with a VSWR of less than 2:1. The demonstrated MM coating has a radius of only λ/24 and extremely light weight, which renders it attractive for use in applications such as broadband arrays and portable wireless devices.