Integral coaxial line phase shifter

Abstract

The invention discloses an integral coaxial line phase shifter which is characterized by comprising a phase shifter cavity, an insulating sleeve, an inner guide post, an input inner guide tube and an output inner guide tube, wherein two or more cavities are arranged on the cross section of the phase shifter cavity, the input inner guide tube and the output inner guide tube are arranged in the cavities, the inner guide post is in a U-shape, the front ends of the inner guide post are respectively inserted into and matched with the input guide tube and the output guide tube in a sliding way, andthe inner guide post, the input inner guide tube and the output inner guide tube transmit signals through coupling. The phase shifter of the invention has the advantages of simple structure, small volume, convenient manufacture, high precision, large range of phase shift, good universality and stable indices in the whole working frequency band.

Description

technical field [0001] The present invention relates to the technical field of antenna equipment, in particular to a coaxial phase shifter with continuously variable phase. Background technique [0002] In order to optimize the coverage of the wireless signal of the cell, the base station antenna in the mobile communication system needs to reasonably adjust the beam pointing of the vertical plane pattern of the base station antenna so that the pointing angle is properly tilted downward in the direction of the horizontal line (beam downtilt for short). ), because in many complex practical application scenarios, the signal coverage and co-channel interference are constantly changing, and the number of users in the cell changes, so the downtilt angle of the antenna beam needs to change frequently in time, and in The location changes continuously, that is, the continuously adjustable beam downtilts the base station antenna. In the past, the combination of fixed electrical downt...

AI Technical Summary

Problems solved by technology

[0004] Generally, the phase shifters used on mobile communication base station antennas are divided into three categories: one is to change the phase of the transmission signal by changing the physical length of the transmission line, and the transmission line of this kind of phase shifter is mostly used by the strip line by moving the length of the strip line. Change the phase of the transmission signal. The disadvantages of this type of phase shifter are inconvenient installation, large size, inconvenient adjustment, and instability; the other type is a phase shifter that changes the relative permittivity of the transmission line, mainly covering the transmission line. Or insert a medium with high dielectric constant, the medium wavelength of the transmission line under high dielectric constant becomes shorter, that is, the transmission line of the same length has more phases of signal transmission under high dielectric constant, the disadvantage of this type of phase shifter is that it has a large loss , the dielectric constant of the medium is unstable, the cost is high, and the process is complicated

Another type is that the phase shifter is a quantized digital phase shifter, which is expensive to manufacture. At the same time, a quantized digital phase shifter will cause a pointing deviation of the beam downtilt angle and cannot continuously change the downtilt angle of the beam.

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