Bow tie cross dipole antenna

Abstract

Disclosed is a bow-tie-shaped crossed vibrator antenna. The bow-tie-shaped crossed vibrator antenna comprises a coaxial feeder line, a reflective cavity and four vibrator units; the four vibrator units are the same in outline dimensions and are all fan-shaped with included angles of 60 degrees; the four vibrator units are distributed in a bow-tie-shaped crossed manner; the four arc-shaped outer edges of the four vibrator units are on the same circumference and the included angle between adjacent vibrator units is 90 degrees; each vibrator unit comprises a fan-shaped dielectric substrate; the upper and lower side surfaces of the dielectric substrate are both attached with copper patches; a square groove which extends from the middle part to the arc-shaped outer edge is formed in each vibrator unit separately; the four vibrator units are connected together to from the bow-tie-shaped crossed vibrator antenna unit, and then the antenna unit is supported on the opening surface of the reflective cavity through a coaxial feeding apparatus; a mounting hole is formed in the central position of the bottom of the reflective cavity; and the bottom end of the coaxial feeding apparatus passes through the mounting hole to be connected with an SMA interface. According to the bow-tie-shaped crossed vibrator antenna, broadband characteristic is realized under a single feeding structure, dual-mode and multiple frequency points of Beidou and GPS navigation systems can be covered, and high gain antenna is realized.

Description

Technical field [0001] The invention relates to an antenna, in particular to an antenna used in GPS and Beidou navigation systems. Background technique [0002] In the field of GPS and Beidou navigation, the realization of antennas at home and abroad in recent years mainly includes the following aspects: [0003] 1. Helical antenna. Helical antennas and their deformed structures are often used in navigation systems due to their own circular polarization characteristics and broadband characteristics. Archimedes spiral antennas, equiangular spiral antennas and their combined structures are superior in performance, but their size is difficult to compress and their profile is relatively high. [0004] 2. Microstrip antenna. Circular polarization can be realized by cutting the angle of the microstrip radiation patch and the design of the feed point, and the structure of the microstrip antenna has a large room for improvement, low profile, low cost, easy to combine with the feed network...

AI Technical Summary

Problems solved by technology

[0007] The following defects exist in the existing technology: the current satellite navigation user machine broadband antenna is mainly based on a double-feed or four-feed structure, the feed structure is complex, it takes up a lot of space, and it requires high technology; its bandwidth is narrow, only 0.8 -1.5GHz, the axial ratio bandwidth is only 0.4-0.6GHz, it is difficult to cover multiple navigation systems at the same time; the gain is low, generally only up to 6dBi, and the efficiency is not high

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