Abstract
We describe a planar ultrawideband (UWB) dual-polarized tightly coupled bowtie antenna array for ground-based polar ice-sounding radar. The array operates over 180–620 MHz with a bandwidth ratio of 3.4:1. The broadband performance is benefitted from the tightly coupled antenna elements. By carefully integrating the impedance matching network into one arm of the bowtie antenna and using a ferrite core for common-mode suppression, this coplanar side-fed array avoids the use of vertical balun and external antenna matching network. The size of the full array is 2.8 m <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times2.8$ </tex-math></inline-formula> m with a weight of only 90 kg, including 24 power distribution boards and 288 feed cables. The thickness of the array is 12.7 cm, which is only about <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.08\lambda $ </tex-math></inline-formula> at the lowest operating frequency. This antenna array was deployed to Greenland in summer 2019 as a part of a surface-based UWB ice-sounding radar to measure and characterize the Greenland ice sheet.
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