Cavity type phase shifter

Abstract

The invention provides a cavity phase shifter. Wiring grooves are formed in a cavity packaging wall parallel to a radio frequency circuit board, and a plurality of wiring grooves can be formed in different packaging walls; the inner conductor of the transmission cable is in tin soldering connection with the radio frequency circuit through the operation hole formed in the wiring groove, so that thethermal deformation influence on the sliding medium caused by high temperature during tin soldering of the outer conductor of the transmission cable is avoided; the inner sides, opposite to the wiring grooves, of the packaging walls are provided with supporting ribs, thereby increasing the supporting points for the radio frequency circuit board, avoiding the deformation of the radio frequency circuit board during the welding operation, eliminating the deformation of the circuit board during welding and the poor welding or the concentration of the internal stress of a welding spot, and providing a guarantee for the stability of the electrical performance of the phase shifter; and meanwhile, the efficiency of automatic welding operation can be improved. Moreover, by controlling the positions and the heights of the supporting ribs, the phase shifter can adapt to the thicknesses of different radio frequency circuit boards, the flexibility of radio frequency circuit design is improved, andthe cost of the phase shifter can be further reduced.

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.

[0004] In order to fix the radio frequency circuit board or the insulating support of the radio frequency circuit board, there are card slots on the left and right package walls in the cavity built in the phase shifter cavity. The structures on both sides of the card slot are asymmetrical, resulting in two The side support is unbalanced, and the circuit board is easily deformed when the feed point is welded, resulting in poor welding or internal stress concentration at the feed point, which seriously affects the stability of the electrical performance of the phase shifter

In addition, in the engineering practice of aluminum alloy extrusion or broaching, the height of the slot is limited and should not be too small. This also puts forward special requirements for the selection of the thickness of the RF circuit board, which limits the impact of the cavity on The adaptability of the basic thickness of the RF circuit is not conducive to the reduction of the overall cost of the phase shifter

In addition, the insufficient stability of the radio frequency circuit in the built-in space of the cavity is also not conducive to the automatic welding operation of the phase shifter components

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