Creation of a Magnetic Boundary Condition in a Radiating Ground Plane to Excite Antenna Modes
Creation of a Magnetic Boundary Condition in a Radiating Ground Plane to Excite Antenna Modes
复制标题
在辐射地平面中创建磁边界条件以激发天线模式
DOI：
--
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发表时间：
2011
影响因子：
5.7
通讯作者：
E. Salonen
中科院分区：
文献类型：
--
作者：
M. Sonkki;M. Cabedo;E. Antonino;M. Ferrando;E. Salonen
为了提高便携式设备的辐射效率和带宽，提出在便携式设备的辐射地平面的对称面中创建磁边界条件。这种磁边界条件是通过对称馈电激励天线来实现的。提出了一种由对称折叠偶极子组成的新型天线，以说明利用该技术可以获得很宽的带宽和很好的辐射特性。利用特征模理论对折叠偶极子和对称折叠偶极子进行了分析比较。研究表明，磁场边界条件有利于在宽频带内激励天线模式，同时避免传输线模式的激励。实现了两种不同的天线原型，单极子天线和对称折叠偶极子天线，并进行了测试。测得的单极子-6分贝阻抗带宽从0.95 GHz扩展到2.15 GHz。对称折叠偶极子的带宽从0.90 GHz扩展到1.96 GHz。在上述带宽下测量的两个原型的总效率的平均值为-1.6分贝。在0.95 GHz处测得的最大总增益单极子为2.6dBI，对称折叠偶极子为1.9dBI。
The creation of a magnetic boundary condition into the plane of symmetry in a radiating ground plane of a portable device is proposed to enhance its radiation efficiency and bandwidth. This magnetic boundary condition is achieved by exciting the antenna through symmetrical feeding. A novel antenna consisting of a symmetrical folded dipole is presented in order to exemplify how a broad bandwidth and very good radiation properties can be obtained with the proposed technique. The Theory of Characteristic Modes is used to analyze and compare a folded dipole with the symmetrical folded dipole. This study shows how the magnetic boundary condition favors excitation of antenna modes in a broad bandwidth while avoiding excitation of transmission line modes. Two different prototype antennas, a monopole and a symmetrical folded dipole with an LC-balun, were implemented and measured. The measured -6 dB impedance bandwidth of the monopole extends from 0.95 GHz to 2.15 GHz. In turn, the bandwidth of the symmetrical folded dipole extends from 0.90 GHz to 1.96 GHz. The average of the measured total efficiencies at the aforementioned bandwidth is -1.6 dB for both prototypes. The measured maximum total gain at 0.95 GHz is 2.6 dBi for the monopole and 1.9 dBi for the symmetrical folded dipole.