Ceramic filter with CTE compensation

Abstract

The invention discloses a ceramic filter with CTE compensation. The ceramic filter comprises a filter body. The signal transmission surface of the filter body is provided with an input end and an output end. The ceramic filter is free of a connecting PCB, can effectively reduce use cost, can improve the buffer performance during connection with a communication system board and can reserve the functions of supporting the filter, connecting signals to the ground and compensating CTE inconsistency of the ceramic and the communication system board when the PCB is used; the ceramic filter with CTEcompensation further comprises a plurality of first elastic metal bonding pads used for being connected with the communication system board; the first elastic metal bonding pads are discretely arranged on the signal transmission surface and are staggered with the input end and the output end; and the thermal expansion coefficient of the first elastic metal bonding pad is equivalent to the thermalexpansion coefficient of the PCB.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a dielectric waveguide filter which can be directly installed on a communication system board and has CTE (that is, coefficient of thermal expansion) compensation. Background technique [0002] With the widespread application of 5G technology, the demand for 5G base stations is gradually increasing, and ceramic dielectric filters have gradually become important components used by various equipment manufacturers. Among them, there are mainly two schemes of single-layer ceramic dielectric filter and double-layer ceramic dielectric filter. [0003] Single-layer ceramic dielectric filters are usually assembled with a supporting PCB board and mounted on the communication system board for use. When used in a single layer, the added PCB board plays the role of supporting the ceramic dielectric filter, connecting the signal ground, and compensating for the CTE inconsistency betwee...

AI Technical Summary

Problems solved by technology

When used in double layers, the added PCB board serves to support the ceramic dielectric filter, connect the signal ground, compensate for the CTE inconsistency between the ceramic and the communication system board, and perform low-pass filtering. The length and width of the double-layer ceramic dielectric filter are single Layer products will be relatively small, but due to the low-pass performance requirements for PCB boards, this kind of PCB board needs a higher-performance RF board, and the cost will increase a lot

[0005] At present, the above two schemes in the industry, such as figure 1 As shown, an additional PCB board 3 is required. The length and width of the corresponding PCB board 3 are generally almost the same as the length and width of the ceramic dielectric filter 1. The application of the PCB board 3 is to realize the ceramic dielectric filter 1 and the communication system. The connection of the board leads to a large increase in the cost of use

And because the PCB board 3 has a certain rigidity, when it is connected with the communication system board, the cushioning performance is poor

Moreover, in the aforementioned two schemes, the input and output ends of the ceramic dielectric filter 1 use solid solderable copper pins 2 with a diameter ranging from 0.5 to 3 mm to transmit signals. When connecting the communication system board, due to the copper Pin 2 is rigid, so the cushioning performance is worse when connected to the communication system board

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