公开(公告)号：US20220393368A1

公开(公告)日：2022-12-08

申请号：US17748160

申请日：2022-05-19

申请人： The Board of Trustees of The University of Alabama

发明人： Linfeng Li ,  Stephen Jie Bang Yan

IPC分类号： H01Q21/24 ,  H01Q21/30 ,  H01Q1/36 ,  H01Q25/00 ,  H01Q21/00 ,  H01Q5/25

摘要： An ultra-wideband dual-polarized tightly coupled bowtie antenna array for ground-based polar ice sounding radar is described. The antenna array has a very large effective aperture to increase the directivity. At the same time, it is lightweight and low profile to minimize the payload and maximize the survey range. In an implementation, the antenna array operates between 180-620 MHz with a fractional bandwidth of 3.4:1. The broadband performance benefits from the tightly coupled antenna elements. A feature of the antenna array is the planar feeding structure without balun. The antenna array element has the microstrip feeding line integrated with one arm of the bowtie antenna. The other arm is directly fed by the microstrip line. By adding a ferrite core around the coax cable for common mode suppression, the bowtie antenna element can be fed differentially without using bulky vertical feeding structure and balun.