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Filters and multiplexers and communication equipment

A filter and acoustic resonator technology, applied in the field of filters, can solve the problems of filter insertion loss deterioration, device size increase, etc., and achieve the effect of improving out-of-band suppression characteristics

Active Publication Date: 2021-01-05
ROFS MICROSYST TIANJIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods will deteriorate the insertion loss of the filter, that is, the improvement of the out-of-band suppression characteristics of the filter is at the expense of the deterioration of the filter insertion loss, and the increase of resonators or peripheral devices will also increase the size of the device

Method used

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  • Filters and multiplexers and communication equipment
  • Filters and multiplexers and communication equipment
  • Filters and multiplexers and communication equipment

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Embodiment Construction

[0039] In the embodiment of the present invention, inductive coupling or capacitive coupling is added between different parallel branches of the filter, and the out-of-band suppression characteristic of the filter is improved without degrading the insertion loss of the filter, which will be described in detail below.

[0040] Figure 1B It is a circuit diagram of a filter involved in an embodiment of the present invention. The structure of the filter is also based on the thinking in the patent application CN109643984A, Figure 1B The filter 100 in the above includes a bandwidth adjustment unit, and the bandwidth adjustment unit is a special parallel connection ground path, which is used to expand the relative bandwidth of the filter. It will be described in detail below.

[0041] Such as Figure 1BAs shown in the figure, T1 is the input terminal of the filter 100, T2 is the output terminal of the filter, and the input terminal T1 and the output terminal T2 are ports connect...

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Abstract

The invention relates to the technical field of filters, in particular to a filter, a multiplexer and a communication device. In this filter, inductive coupling or capacitive coupling is added between different parallel branches. For the filter, the inductive coupling or capacitive coupling will not deteriorate the insertion loss performance of the filter, but also improve the filter out-of-band suppression feature.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a filter, a multiplexer and a communication device. Background technique [0002] With the development of wireless communication applications, people have higher and higher requirements on the data transmission rate. Corresponding to the data transmission rate is the high utilization rate of spectrum resources and the complexity of spectrum. The complexity of the communication protocol puts forward strict requirements on the various performances of the radio frequency system. In the radio frequency front-end module, the radio frequency filter plays a vital role. It can filter out the out-of-band interference and noise to meet the requirements of the radio frequency system and communication Protocol requirements for signal-to-noise ratio. [0003] RF filters are mainly used in wireless communication systems, for example, RF front-ends of base stations, mobile phones, computers, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/64
CPCH03H9/64
Inventor 边子鹏庞慰
Owner ROFS MICROSYST TIANJIN CO LTD