Band elimination filter and base station equipment

Abstract

The invention provides a band elimination filter and base station equipment. The band elimination filter comprises a dielectric slab, a signal transmission microstrip line, a coupled microstrip line and a grounded metal layer, wherein the dielectric slab is provided with a first surface and a second surface which are opposite to each other; the signal transmission microstrip line is arranged on the first surface, and is used for transmitting signals; the coupled microstrip line is arranged on the second surface, and is at least partially spatially overlapped with the signal transmission microstrip line; the grounded metal layer is arranged on the second surface, and is connected with the coupled microstrip line; and when transmitting the signals, the signal transmission microstrip line and the coupled microstrip line are coupled by the dielectric slab. The band elimination filter provided by the invention can filter high-power signals, and has a low size and low production cost.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a band rejection filter and base station equipment. Background technique [0002] Facing the current increasingly fierce market competition, the performance of base station products is the main focus of competition in the industry. Power amplifiers, as an important part of base stations, are directly related to the quality of transmitted signals and communication effects. The most important indicators of power amplifiers are linearity and efficiency, and these two indicators are contradictory to each other. To achieve high linearity while pursuing high efficiency, it is difficult to rely solely on the performance of the power amplifier itself, and a specific band-stop filter is required. Auxiliary realization. [0003] In the prior art, the more common band-stop filters are mainly realized through the structure of microstrip coupling, and figure 1 The band-stop filter in ...

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Problems solved by technology

[0004] from figure 1 It can be seen from the figure that there needs to be a certain distance between the signal transmission microstrip line 101 and the coupling microstrip line 102. The distance is determined according to the frequency of the signal to be filtered out, and the distance cannot be too large, otherwise it cannot be realized. filter effect

When the distance between two microstrip lines is small and the power of the signal to be transmitted is large, sparking may occur between the two microstrip lines, which will cause the microstrip line to burn out

[0005] There is another band-stop filter in the prior art, which is realized by a microstrip equivalent LC (inductance-capacitance) network. This band-stop filter can meet relatively high-power signals, but its size is several times larger , higher production cost

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