Filter assembly based on SAW-BAW technology combination application

A filter and acoustic wave filter technology, applied in the field of filters, can solve the problem of reducing the volume of the filter, and achieve the effect of reducing the size, small volume, and expanding the coverage.

Pending Publication Date: 2020-11-13
XWAVE TECH (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that it is difficult to reduce the overall volume of the filter and improve the performance of the filter in the existing technology

Method used

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  • Filter assembly based on SAW-BAW technology combination application

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Embodiment 1

[0027] A filter assembly based on a combined application of SAW-BAW technology, comprising a first acoustic wave filter and a second acoustic wave filter coupled to a common node. The first acoustic wave filter includes a surface acoustic wave resonator and a series bulk acoustic wave resonator coupled between the surface acoustic wave resonator and the common node.

[0028] Each of the first acoustic wave filter and the second acoustic wave filter includes series-connected surface acoustic wave resonators and series-connected bulk acoustic wave resonators.

[0029] The number of bulk acoustic wave resonators in the first acoustic wave filter is greater than twice the number of surface acoustic wave resonators.

[0030] A surface acoustic wave resonator includes at least five resonators.

[0031] The first acoustic wave filter may further include parallel bulk acoustic resonators coupled to the common node, the parallel bulk acoustic resonators being coupled to the surface ac...

Embodiment 2

[0036] Refer to attached figure 1 , a filter assembly based on the combined application of SAW-BAW technology in this embodiment, including TX1 port, RX1 port, TX2 port and RX2 port respectively connected to the COM port, the TX1 port, RX1 port, TX2 port, RX2 port The ports are connected in parallel with the COM port through different filter branches, and the filter branches of the TX1 port, RX1 port, TX2 port, and RX2 port all include several SAW resonators and several BAW resonators.

[0037] Wherein, the filter branch connected to the TX1 port and the COM port includes a SAW resonator 1 21, a SAW resonator 2 23 and a BAW resonator 1 25 connected in series in sequence, between the SAW resonator 1 21 and the SAW resonator 2 23 The third SAW resonator 22 is connected in parallel, the fourth SAW resonator 24 is connected in parallel between the second SAW resonator 23 and the first BAW resonator 25, and both of the third SAW resonator 22 and the fourth SAW resonator 24 are grou...

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Abstract

A filter assembly based on SAW-BAW technology combination application of the present invention includes a first acoustic wave filter and a second acoustic wave filter coupled to a common node. The first acoustic wave filter includes a surface acoustic wave resonator and a series bulk acoustic wave resonator coupled between the surface acoustic wave resonator and the common node. A very small volume is achieved by integrating the latest bulk acoustic wave (BAW) and surface acoustic wave (SAW) filter techniques. The volume advantage is helpful for mobile phone manufacturers to produce ultrathinmobile phones, and is also helpful for integrating advanced multimedia functions to meet the requirements of users. The filter assembly is combined with traditional LC filters, duplexers and multiplexer products to help solve various carrier aggregation configurations deployed by operators and the like, and therefore the coverage range, speed and capacity of a gigabit network are expanded; user experience is enhanced.

Description

technical field [0001] The invention belongs to the technical field of filters, in particular to a filter assembly based on the combined application of SAW-BAW technology. Background technique [0002] In RF filters, an important characteristic is the steepness of the transition band, that is, the curve between the passband and stopband in the filter bandpass characteristic. If the transition bandwidth between the passband and the stopband is too narrow, it will greatly increase the difficulty of filter design. In order to increase the steepness of the transition band, the connection circuit design between the resonators that make up the filter is very important, but the characteristics (quality factor or Q value) of the resonant unit itself are also key factors. In order to meet the filter design requirements of these difficult frequency bands, it is necessary to increase the Q value of the resonant unit all the time. [0003] SAW devices have been widely used in radio fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/64H03H9/54
CPCH03H9/64H03H9/54H03H9/1455
Inventor 胡孝伟代文亮赵瑞洁
Owner XWAVE TECH (SHANGHAI) CO LTD
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