A miniaturized dielectric phase shifter

Abstract

The invention relates to a miniaturized dielectric phase shifter which comprises a box body, a cover plate, a transmission line, a dielectric block and a slide mechanism. The box body is a hollow rectangular block with one open end. The cover plate is arranged on the open part of the box body in a matching way. The outer side of the cover plate is provided with the slide mechanism and a slide hole. The transmission line and the dielectric block are arranged inside the chamber of the box body. The transmission line is connected with the box body inner wall in an insulating way. After passing through the slide hole on the cover plate, the dielectric block is connected with the external slide mechanism. The dielectric block side surface adjacent to the transmission line is provided with a side surface groove. The central part of the transmission line passes through the side surface groove of the dielectric block. The transmission line and the dielectric block do not contact each other. The miniaturized dielectric phase shifter with a small volume is especially suitably used in a base station tunable antenna with a limited space. Furthermore, the phase shifter with a simple structure is easy to process and manufacture and has the characteristics of continuous phase changes, good cross modulation characteristics and great phase shift quantity.

Description

technical field [0001] The invention relates to the fields of mobile communication base station antennas and radio frequencies, in particular to a miniaturized dielectric phase shifter applied to electrically adjustable base station antennas. Background technique [0002] At present, the electric adjustment base station antenna has been widely used in China's cities and rural areas, and the electric adjustment of the base station antenna mainly relies on the phase shifter to change the feeding phase of each antenna unit in the antenna array, so as to realize the downtilt of the main beam of the antenna. That is, the ESC is tilted down. [0003] At present, the phase shifter mainly changes its phase in two ways, one is by changing the physical length of the signal transmission, the transmission line part with variable physical length is generally printed on the pcb board, and the coupling method is mostly used to connect with the main feeder line, as in the patent 03815422.6...

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Problems solved by technology

[0003] At present, the phase shifter mainly changes its phase in two ways, one is by changing the physical length of signal transmission, the part of the transmission line with variable physical length is generally printed on the pcb board, and the coupling method is often used to connect with the main feeder line, as in the patent 03815422.6, this method has high requirements on the smoothness of the printed board, and the slack of the circuit board will change the coupling, thereby affecting the standing wave ratio and power division ratio of the phase shifter, and the performance is unstable

[0004] The other is to change the equivalent power-saving constant. This method usually uses the moving dielectric plate near the feeder to change the area of ​​the dielectric plate covering the feeder, thereby changing the equivalent power-saving constant and making the signal output different phases, such as patent 201020148882.3, The transmission line part of this phase shifter adopts a strip line structure, and the central metal feeder part is mostly a linear structure, which is large in size and complex in structure, and is not suitable for large-scale processing. Due to the high cost of the dielectric plate with high dielectric constant, the actual Most of them use dielectric plates with low dielectric constants, which can achieve small phase shifts

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