A monopole antenna

Abstract

The invention discloses a monopole antenna, which comprises a radiating unit, a circular substrate and a feeding coaxial line. The radiating unit includes four radiating plates with identical structures and sizes; the radiating plates are in the shape of a right-angled trapezoid, and There is a rectangular groove at the waist of the right angle, the long side of the groove is parallel to the upper bottom of the radiating plate, the short side of the groove is perpendicular to the upper bottom of the radiating plate, the four radiating plates are located above the base plate, and the four radiating plates The lower bottom edges of the boards are brought together so that their right-angled waists form a "ten" shape. The lower bottom edges of the radiant boards are perpendicular to the substrate. There is a mounting hole in the center of the substrate. The acute angle parts of the four radiant boards enter the mounting holes. The axis is fixed in the installation hole and welded to the vertices of the acute angle parts of the four radiant panels; a circular cover plate is arranged above the four radiant panels, and the cover plate covers the four radiant panels and is connected to the four radiant panels. The right angle waist is fixedly connected; the advantage is that it can realize omnidirectional radiation.

Description

technical field [0001] The invention relates to an antenna technology; in particular, it relates to a monopole antenna. Background technique [0002] With the rapid development of science and technology, people's lives are becoming more and more modernized, and limited frequency resources are becoming more and more tense. People have put forward higher requirements for the capacity and transmission rate of wireless communication, whether in military communication or civilian communication systems. It not only requires high-quality transmission of voice, text, image and other information, but also requires broadband, miniaturization and sharing of equipment. As a device for transmitting and receiving electromagnetic waves, the antenna is an important part of the wireless communication system. The performance of the antenna directly determines the quality of the wireless communication system. In the modern military communication system, frequency hopping and spread spectrum t...

AI Technical Summary

Problems solved by technology

[0003] However, in the high frequency band, the finite height unloaded monopole antenna currently used in most cases

However, because the input impedance of the finite height unloaded monopole antenna changes drastically with the resonant frequency, and it is difficult to match the 50 ohm feed coaxial line, resulting in a narrow bandwidth and a large profile, it is difficult to achieve omnidirectional radiation

For example, the commonly used RLC monopole antenna, although the RLC monopole antenna can achieve a wider bandwidth, but its electrical length can reach one-sixth of the wavelength, which is not conducive to realizing the low profile of the antenna

Although the equivalent monopole antenna has a small electrical length, its radiation has strong directivity, and it is difficult to achieve omnidirectional radiation.

Under the current technical conditions, to cover the entire communication frequency band and achieve omnidirectional radiation, several antennas are generally required to work at the same time. However, due to the mutual coupling effect between the antennas, the performance of the entire antenna system is greatly reduced.

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