双频段双极化微带天线阵列设计*

设计了一种双频段双极化的阵列天线。该阵列天线采用多层微带天线形式,七层结构,通过口径耦 合和微带线边馈两种馈电方式实现双线极化,在辐射贴片上方增加寄生贴片以扩展带宽,实现双频段。天线工作在 12.25 ~12.75GHz 及14 ~ 14.5GHz,实测增益18dB 左右,隔离度大于40dB。该天线剖面低,重量轻,可作为子阵组 成更大规模的双频段双极化阵列。

Design of the Dual-Band Dual-Polarized Microstrip Array

A dual-band dual-polarized array is introduced in this paper. It is a microstrip array with seven layers and has the advantages in lightweight and low profile. The dual linear polarization is realized by aperture coupling and microstrip line feeding. And the dual bands are realized by adding parasitic patch on the main patch. The operating frequencies are 12. 25 ~12. 75GHz and 14 ~14. 5GHz respectively. The isolation between the two ports is better than 40dB across the entire operating bandwidth. The measured gain is about 18dBi. This antenna can be used as subarray to fabricate large-scale dual-band dual-polarized array.