Strip line structure for low-pass filter, low-pass filter, and communication device and system

Abstract

The invention relates to the technical field of filters, and in particular to a strip line structure for a low-pass filter. The strip line structure comprises at least two longitudinally-stacked and parallel strip line sub-layers. The respective strip line sub-layers have the same planar pattern. The two-dimensional dimensions of the respective strip line sub-layers are in an equally proportionalscaling relationship. The strip line sub-layer having small area is completely located within the coverage of the strip line sub-layer having large area. The gaps between the strip line sub-layers arefilled with dielectric base layers. The strip line sub-layers are coupled to each other. The invention also discloses a low-pass filter using the strip line structure, and a communication device andsystem. The strip line structure reduces the loss of a signal during circuit transmission, thereby achieving a purpose of reducing the system loss. The miniaturization of an apparatus can be further achieved.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a stripline structure for a low-pass filter, a low-pass filter, a communication device and a system. Background technique [0002] With the advent of the 5G communication era, the requirements for the weight and volume of base station equipment are getting smaller and smaller. Due to the advantages of miniaturization, low loss and good temperature characteristics, dielectric filters have become an inevitable option for base station equipment in the 5G era. Among them The application of ceramic waveguide filter is the most representative. In the practical application of ceramic waveguide filters, it must be used together with a low-pass filter for far-end suppression to form a filter component. The final performance of this filter component depends not only on the ceramic waveguide filter itself, but also on the low-pass Pass filters are closely related. [0003] The low-pass fi...

AI Technical Summary

Problems solved by technology

For the ceramic waveguide filter technology that must be used in the 5G era, the traditional solution is to reduce the loss of the ceramic filter part, such as using low dielectric constant ceramic materials, using multi-mode technology, etc., but using low dielectric constant The material will increase the volume and cannot meet customer requirements; the use of multi-mode technology is less cost-effective and the mass production is not high; in contrast, the optimization of the low-pass filter part has been ignored, but the stripline low-pass filter is not without room for optimization

[0005] From the perspective of electronic system design, current density is a very important indicator. The performance of the circuit is closely related to the amount of current, and the current density is determined by the size and shape of the conductor. The circuit layer in the stripline low-pass filter Its essence is to form a metal layer with a specific pattern (used to form a stripline resonator circuit). The area will be more confined near the surface, which will increase the current density. If the current density is too high, the loss will also increase, which will have adverse consequences on the overall performance of the filter.

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