Four-element interconnected symmetrical dipole circular loop antenna array for direction finding with electrically small spacing

Abstract

The invention discloses a four-unit-interconnected dipole-structure loop antenna array for electric small-spacing direction finding and relates to array antennae. The four-unit-interconnected dipole-structure loop antenna array for electric small-spacing direction finding comprises four dipole-structure antennae and two antenna connection segment structures, wherein the four dipole-structure antennae are evenly distributed in a circular array mode. Upper and lower structures of each of four dipoles are connected directly through the corresponding antenna connection segment structure, electric small spacing refers to that spacing between every two adjacent units is far smaller than operating wavelength, a radiating unit comprises four dipole structures made of same materials and identical in size, and the four dipole structures are disposed on a reference plane parallelly and are evenly distributed in a circular array mode at intervals by uniform angles. The upper half portions of the four dipole structures are directly connected through the antenna connection segment structures, the lower half portions thereof are directly connected through the same antenna connection segment structures, and the antenna connection segment structures are formed by connection of four-segment cylinder structures according to a regular quadrangle and are made of metal materials as same as those of dipoles in diameter.

Description

technical field [0001] The present invention relates to array antennas, in particular to an electrically small-pitch array antenna design for super-resolution estimation of arrival angle (Direction of Arrival, DOA). Background technique [0002] Spatial spectrum estimation is used to solve the problem of spatial energy distribution of received signals, so as to determine the number of signals or the direction of arrival of signals ([1] Wang Yongliang, Ding Qianjun, Li Rongfeng. Adaptive processing [M]. Beijing: Tsinghua University University Press, 2009; [2] Wang Yongliang, Chen Hui, Peng Yingning, Wan Qun. Spatial Spectrum Estimation Theory and Algorithm [M]. Beijing: Tsinghua University Press, 2004) The direction of arrival estimation is also called the angle of arrival estimation ([ 3] Haykin S, Liu K J R. Handbook on array processing and sensor networks [M]. John Wiley & Sons, 2010). Direction of arrival estimation is concerned with finding the position of a radiation s...

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Problems solved by technology

[0007] The direction-finding antenna structure involved in the above three patents, although considering factors such as miniaturization and simple structure, is not suitable for space-constrained platforms or low-frequency bands

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