Miniaturized high-overload-resistant circularly polarized omnidirectional antenna

Abstract

The invention discloses a miniaturized high-overload-resistant circularly polarized omnidirectional antenna. The antenna comprises an antenna housing internally provided with a spiral assembly and a low-noise amplifier assembly, and the spiral assembly is fixed in the antenna housing through the low-noise amplifier assembly; the spiral assembly comprises a spiral column, and double spiral lines are arranged on the spiral column; the low-noise amplifier assembly comprises a low-noise circuit board fixed between the low-noise amplifier cavity and a low-noise amplifier shielding cover; the spiralcolumn is fixedly connected with the low-noise amplifier cavity, one end of the double spiral lines is connected with the low-noise circuit board, and the other end of the double spiral lines is grounded; and a fixing bolt sequentially penetrates through the low-noise amplifier shielding cover and the low-noise amplifier cavity to be fixedly connected with the antenna housing. According to the circularly polarized antenna provided by the double spiral lines, satellite signals can be received in a whole flight process of an aircraft, and particularly, reliability of the received signals can beensured under a condition that the aircraft faces the ground.

Description

technical field [0001] The invention belongs to the technical field of aircraft antennas, and relates to a miniaturized high-overload-resistant circularly polarized omnidirectional antenna. Background technique [0002] With the development of science and technology, the application fields of various aircraft guidance systems are constantly expanding, and aircraft satellite navigation antennas have become a new research hotspot. However, it is very difficult to put the antenna into the head of the aircraft. The antenna of the aircraft must be small in size, light in weight, good in mechanical strength and rigidity, and must meet the requirements that the aircraft can receive satellite signals in different attitudes. In order to realize antenna miniaturization and high overload resistance requirements, technical workers have conducted research from many aspects. [0003] There are mainly two types of antennas installed on the head of the aircraft before, one is a microstrip ...

AI Technical Summary

Problems solved by technology

Although it solves the problem of miniaturization of aircraft antennas, there are still some problems. The first problem is that the single helical antenna is a linearly polarized antenna, while the satellite signal is a circularly polarized signal, which will cause the linearly polarized antenna to receive circular polarized signals. The signal loses 3dB gain; the second problem is that due to the small size of the single helix antenna, different reflectors will affect the resonant frequency and pattern of the antenna, the consistency is poor, and it is easy to be interfered by the outside world

[0005] To sum up, for the antenna installed on the head of the aircraft, it is often hoped that it can not only generate circular polarization, but also meet the requirements of miniaturization and high overload resistance. However, the existing aircraft antennas cannot meet the above requirements at the same time.

Images