Impact of matching networks on direction finding performance utilizing two closely spaced electrically small antennas

Direction of arrival (DOA) of a microwave signal is important for many commercial and military applications. Accurate DOA estimation technique with small system size is highly desirable. Electrically small antenna array with small spacing between any two adjacent antennas is attractive because of the compact size of the whole system. The challenge is how to achieve high accuracy of DOA estimation under this circumstance.