Wide-beam magnetic dipole antenna

Abstract

The invention discloses a wide-beam magnetic dipole antenna, comprising a semicircular magnetic dipole structure and an elongated parasitic unit, wherein the semicircular magnetic dipole structure comprises two semicircular patches of the same radius and a vertical short circuit wall, the two semicircular patches are symmetrically placed in parallel up and down, and the vertical short circuit wallis connected to the two semicircular patches along the diameter direction of the semicircular patches; the elongated parasitic unit is placed along the central axis of the semicircular magnetic dipole structure, and is connected to the upper surface of the semicircular magnetic dipole structure; and the semicircular magnetic dipole structure is in a non-fully enclosed structure. The invention hasthe characteristics of small volume, high gain, low profile and simple structure, and has wide application prospects in various wireless sensing and radio frequency identification systems of the Internet of Things.

Description

technical field [0001] The invention belongs to the Internet of Things and microwave technology, in particular to a wide-beam magnetic dipole antenna. Background technique [0002] In satellite communication, in order to meet the needs of communication, the ground mobile communication terminal antenna is generally required to have the performance characteristics of wide beam. At present, the axial mode helical antenna is mostly used in satellite communication systems. This antenna has high gain and wide frequency bandwidth, but its beam is narrow, and the half-power beam width is only about 60°. When the satellite is not located in the beam of the ground receiving antenna When within the range, the signal will be transmitted to the antenna through multiple channels such as multipath fading. At this time, the strength becomes extremely weak and may even cause the ground system to stop receiving the signal. Therefore, in order to compensate for the low elevation gain of the g...

AI Technical Summary

Problems solved by technology

At present, the axial mode helical antenna is mostly used in satellite communication systems. This antenna has high gain and wide frequency bandwidth, but its beam is narrow, and the half-power beam width is only about 60°. When the satellite is not located in the beam of the ground receiving antenna When within the range, the signal will be transmitted to the antenna through multiple channels such as multipath fading. At this time, the strength becomes extremely weak and may even cause the ground system to stop receiving the signal

Therefore, in order to compensate for the low elevation gain of the ground receiving antenna, the antenna is usually designed as an active antenna, but the cost is increased

[0003] Microstrip patch antenna is the most widely used antenna in microwave systems, but the half-power beam of ordinary microstrip patch antenna is narrow (60° half-power beam is a typical value of microstrip patch antenna); The gain difference in the horizontal direction is more than 10dB, which cannot meet the wide beam requirements of satellite navigation antennas

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