太赫兹科学与电子信息学报, 2019, 17 (4): 632, 网络出版: 2020-01-09
超宽带双极化平面交叉偶极子天线设计
Design of ultra-wideband dual-polarized planar cross-dipole antenna
摘要
设计了一种新型单层结构的超宽带双极化平面交叉偶极子天线。该天线采用 2对方环偶极子正交排布实现双线极化, 在方环偶极子内部加载枝节, 外部加载寄生方环, 引入新谐振点, 大幅度扩展了天线带宽; 天线结构紧凑, 尺寸仅为 0.25λL.0.25λL(λL为低频截止频率对应的空间自由波长)。设计和加工制作了一件工作于甚高频 (VHF)频段的天线样品, 测试结果表明, 该天线能够在55~155 MHz实现电压驻波比 (VSWR)<2.5, 阻抗带宽达到 96%, 同时天线在整个工作频带呈现良好的定向辐射特性, 增益大于 7 dB。
Abstract
A novel ultra-wideband dual-polarized planar cross-dipole antenna with single-layer structure is designed. The antenna utilizes two cross loop dipoles to achieve dual linear orthogonal polarization. The stubs inside the dipoles, parasitic square loops outside the dipoles and new resonance points significantly enlarge the impedance bandwidth. The proposed antenna has compact structure with the size only 0.25λL.0.25λL, where λL is the wavelength corresponding to the lowest frequency within the whole working frequency band. As a sample, a Very High Frequency(VHF) antenna is designed, fabricated and measured. The measured results show that the antenna can achieve Voltage Standing Wave Ratio(VSWR)<2.5 at 55-155 MHz, and the impedance bandwidth reaches 96%. The antenna has good directional radiation patterns in the whole working frequency band, and the gain is above 7 dB.
李杰, 陈星. 超宽带双极化平面交叉偶极子天线设计[J]. 太赫兹科学与电子信息学报, 2019, 17(4): 632. LI Jie, CHEN Xing. Design of ultra-wideband dual-polarized planar cross-dipole antenna[J]. Journal of terahertz science and electronic information technology, 2019, 17(4): 632.