一种宽带小型化的双圆极化天线设计

A broadband and miniaturized dual circularly polarized antenna

摘要:

设计了一种覆盖X频段的双圆极化天线，通过1个3 dB电桥分别给2个垂直交叉放置的Vivaldi天线馈电来实现双圆极化。为了实现宽带小型化，在Vivaldi天线表面开槽并且电桥采用耦合形式实现。仿真结果表明，所设计的天线整体尺寸为0.48λ×0.48λ×0.5λ(λ对应最低频率处波长)，能够在8~12 GHz的频带内实现天线驻波比(VSWR)<2，轴比为3 dB，带宽为40%的左旋和右旋圆极化。

Abstract:

A dual circularly polarized antenna covering X-band is designed. Two vertical Vivaldi antennas are fed by a 3 dB coupler to achieve dual circular polarization. In order to achieve broadband miniaturization, the Vivaldi antenna is slotted and a slot-coupled 3 dB coupler is adopted. The simulation results show that the overall size of the designed antenna is 0.48λ×0.48λ×0.5λ(λ corresponding to the wavelength at the lowest frequency); it can achieve Left-Handed and Right-Handed Circular Polarization(LHCP/RHCP) with Voltage Standing Wave Ratio(VSWR)<2 and 3 dB of Axial Ratio(AR), 40% of bandwidth from 8 to 12 GHz.