一种变压器巴伦馈电的超短波紧耦合阵列天线

紧耦合阵列天线(Tightly Coupled Array, TCA)具有超宽带、低剖面、宽角扫描等特点,近年来受到国内外学者的广泛关注。然而,在甚高频(VHF)、特高频(UHF)频段TCA 由于馈电网络设计困难等原因现有的研究报道很少。为了填补这一空白,本文设计并测试了一款变压器巴伦馈电的TCA,利用变压器巴伦解决了单元平衡馈电困难问题,同时采用短路枝节抑制E面共模谐振,采用频率选择表面(FSS)匹配层改善宽角扫描阻抗匹配。实测结果表明,该天线在110~520 MHz 频带内、±40°扫描角范围内电压驻波比<2.5,和仿真结果吻合。

An Ultrashort Wave Tightly Coupled Array Fed by Transformer Balun

Tightly coupled array(TCA) has the characteristics of ultra-wideband, low profile and wide angle, which has been widely studied in recent years. However, TCA in VHF and UHF frequency band has not been studied much due to difficult unit feeding. In order to fill this gap, a TCA fed by transformer balun is designed and tested in this paper, which solves the problem of unit balancing feeding by using transformer balun. At the same time, short-circuit branches are used to suppress E-plane common mode resonance, and FSS matching layer is used to improve wide-angle scanning impedance matching. The measured results show that the VSWR of the antenna is less than 2.5 in the frequency band of 110-520 MHz and the scanning angle range of ±40°, which is consistent with the simulation results.