超宽带双极化交叉偶极子天线设计

Design of cross dipole antenna with ultra-wide band and dual-polarization properties

提出一种结构简单的新型超宽带双极化天线。采用交叉偶极子天线实现双线极化;每只偶极子天线由两个八边形环振子构成,同时在八边形环内部加载寄生枝节,引入新谐振点增加天线带宽;天线结构紧凑,尺寸仅为0.3λ_(L)×0.3λ_(L)(λ_(L)为低频截止频率对应的空间自由波长)。对天线进行加工测试,测试结果表明,该天线在1.24~4.42 GHz能够实现电压驻波比(VSWR)<2,相对带宽达到125%,方向图带宽为95%(1.24~3.60 GHz)。天线定向辐射性能良好,在方向图带宽内增益大于7 dB。

A new type of ultra-wide band dual-polarized antenna with simple structure is presented.The antenna uses cross dipole antennas to generate dual polarization,each dipole antenna is composed of two octagonal rings.The stubs are loaded inside the octagonal ring to introduce new resonance frequency points,which greatly increases the bandwidth.The presented antenna has a compact structure with a planar size of only 0.3λ_(L)×0.3λ_(L),whereλ_(L) is the wavelength corresponding to the lowest frequency within the whole working frequency band.An antenna sample has been fabricated and tested.The measured results show that the antenna can achieve Voltage Standing Wave Ratio(VSWR)<2 in 1.24-4.42 GHz.The relative bandwidth is 125%and the pattern bandwidth is 95%(1.24-3.60 GHz).The directional radiation performance is good,and the gain in the pattern bandwidth is greater than 7dB.