Cavity type phase shifter

Abstract

The invention provides a cavity type phase shifter. The cavity type phase shifter comprises a cavity and a radio frequency circuit board arranged in the cavity; the cavity is provided with a pluralityof packaging walls, at least one wiring groove is formed in at least one packaging wall parallel to the surface of the radio frequency circuit board, and an operation hole for welding the transmission cable core wire is formed in the wiring groove; and the transmission cable is wired along the wiring grooves and penetrates through the operation hole in the wiring grooves to be connected with theradio frequency circuit board in a welding manner. The wiring grooves are formed in the packaging wall parallel to the radio frequency circuit board, the multiple wiring grooves are formed in different packaging walls, the transmission cable inner conductor is in tin soldering connection with the radio frequency circuit through the operation hole, and tin soldering connection is allowed to be conducted only after the transmission cable outer conductor is in tin soldering connection with the cavity wiring grooves, so the thermal deformation influence on the sliding medium caused by high temperature when the outer conductor of the transmission cable is soldered is avoided, and the reliable realization of the phase adjusting function of the phase shifter is ensured; and the size of the phaseshifter is reduced, and the phase shifter is lighter and lower in cost.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a cavity type phase shifter. Background technique [0002] In the coverage of mobile communication network, the electronically adjustable antenna is one of the key equipment of the coverage network, and the phase shifter is the core component of the electronically adjustable antenna. The performance of the phase shifter directly determines the performance of the electronically adjustable antenna, which in turn affects the Therefore, the importance of phase shifters in the field of mobile base station antennas is self-evident. Most of the mainstream phase shifters are developed using the scheme of "cavity + radio frequency line + sliding medium attached to the upper and lower surfaces of the radio frequency line". The signal output by the phase shifter forms a continuous linear phase difference, thereby achieving the purpose of adjusting the downtilt angle through ...

AI Technical Summary

Problems solved by technology

There are also some defects in this patent solution: firstly, regardless of the inclination angle between the axis of the first through hole and the longitudinal direction of the cavity, the transmission cable will inevitably be bent, which is easy to cause stress on the solder joint of the cable outer conductor and form intermodulation hidden danger; secondly, the first through hole is arranged on the wiring groove with uneven shape, which is difficult to process and the processing cost is relatively high, and because of the large number of slots penetrating into the interior, it is easy to cause mechanical damage in the cavity where the radio frequency line is located. The burr remains, forming a hidden danger of intermodulation; again, the setting of the wiring groove also limits the wiring of the transmission cable outside the phase shifter. The transmission cable can only be routed in the horizontal plane where the wiring groove is located. In order to avoid the too small bending radius of the transmission cable When the antenna is bent, enough space needs to be reserved between the phase shifters, which often limits the realization of further miniaturization of the antenna width; finally, the sliding medium needs to be loaded into the cavity with the radio frequency circuit before the outer conductor of the transmission cable is welded In the body, due to the high temperature generated by the soldering operation, there is a hidden danger of thermal deformation of the sliding medium, which affects the electrical performance and increases the friction of the medium sliding, which affects the realization of the phase shifter phase adjustment function.

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