A UWB Constant Beam Directional Antenna

Abstract

The invention discloses an ultra-wideband constant-beam directional antenna, which includes a radiator. The radiator adopts a printed logarithmic periodic antenna with non-frequency-variable ultra-wideband characteristics, including two pairs of printed logarithmic periodic antennas that are The tops of the several-period antennas close together in the direction perpendicular to the antenna plane to form an inverted V-shaped array, and at the top corners of the inverted V-shaped array, there is a preset angular distance between two pairs of printed logarithmic periodic antennas. By using a printed logarithmic periodic antenna with non-frequency variable ultra-wideband characteristics, two pairs of printed logarithmic periodic antennas are mirrored to form an inverted V-shaped array, and the two printed logarithmic periodic antennas are controlled at the top angle of the inverted V-shaped array. There is a preset vertex angle spacing at the place. With such a structural design, the beam width of the directional antenna is constant, the fluctuation is small, and the signal transmission is stable. At the same time, the radiator of this application is in the form of a printed logarithmic periodic antenna, which has a small Advantages such as simplification, light weight, easy processing, low cost and good consistency.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to an ultra-wideband constant beam directional antenna. Background technique [0002] The antenna is a mutual converter for the internal signal of the radio detection equipment to propagate between the transmission line and the free space. The performance of the antenna fundamentally determines the quality of the technical indicators of the entire detection system. Since various detection devices work in various frequency bands, an extremely wide-band electromagnetic wave space is formed in the working area. To detect multiple targets at the same time, the antennas of radar, communication and other detection devices are required to have a wide range. The pursuit of longer detection distance and higher receiving sensitivity requires greater antenna gain; the pursuit of higher interception rate and detection accuracy requires antenna beam equalization and constant beam width. In thi...

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Problems solved by technology

Although the planar helical antenna has a wide operating bandwidth (10 octaves) and a relatively constant beam width, its gain is low (up to about 5dBi), the waveform is prone to change, and the beam pointing stability is poor, which is not conducive to the improvement of receiving sensitivity and pointing accuracy. ;Constant beam horn antennas generally adopt the form of corrugated horn antennas, or horn antennas whose outer arms are elliptical, exponential and other special function curves. Although they have a high gain in the working frequency band (about 10dBi), their working bandwidth Limited, no more than 3 octaves; the Vivaldi antenna has a wide operating bandwidth (10 octaves) and a constant beamwidth. Compared with the planar helical antenna, it has higher gain (up to 7-8dBi), but the entire working frequency band The pattern difference between the inner E surface and the H surface is relatively large, and the degree of equalization of the beam is not high, which affects the interception rate and detection accuracy of the detection equipment

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