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Filter and manufacturing method thereof, multiplexer, and communication equipment

A manufacturing method and filter technology, which are applied in the field of filters, can solve the problem of higher and higher requirements for terminal data throughput and power consumption, and achieve the effects of reducing coupling, improving roll-off, and improving out-of-band suppression.

Active Publication Date: 2020-05-29
ROFS MICROSYST TIANJIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increasingly crowded spectrum resources, the data throughput and power consumption requirements of terminals are getting higher and higher, which brings great challenges to the design of RF front-end circuits

Method used

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  • Filter and manufacturing method thereof, multiplexer, and communication equipment
  • Filter and manufacturing method thereof, multiplexer, and communication equipment
  • Filter and manufacturing method thereof, multiplexer, and communication equipment

Examples

Experimental program
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Embodiment Construction

[0067] In the embodiment of the present invention, by reasonably setting each component in the low-pass filter, the coupling between the inductors, that is, the mutual inductance can be reduced, thereby improving the out-of-band suppression performance of the filter. At the same time, the piezoelectric The resonator replaces the capacitor in part of the parallel branch, which can also improve the roll-off performance of the filter, which will be described in detail below.

[0068] figure 1 The circuit diagram of the low-pass filter provided for this embodiment, such as figure 1 As shown, the series branch between the input port and the output port includes three inductors Ls1~Ls3, each node of the series branch is respectively connected to a parallel branch, and each parallel branch includes an inductor and a capacitor connected in series Composed of resonant circuits, such as Lp1 and Cp1. The circuit includes 7 inductors. Since there is an electromagnetic field around each ...

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Abstract

The invention relates to the technical field of filters, in particular to a filter, a manufacturing method thereof, a multiplexer, and communication equipment. According to the invention, the method comprises the steps: manufacturing a low-pass prototype filter in multiple layers of ceramic substrates which are arranged in an up-down stacked mode through the low-temperature co-fired ceramic technology; in the low-pass prototype filter, connecting a plurality of first inductors in series to form a series branch of the filter, and connecting second inductors and capacitors in series to form a parallel branch of the filter; and replacing the capacitor in the parallel branch close to the input end and / or the output end with the piezoelectric resonator so as to manufacture the hybrid filter ofwhich the performance conforms to a preset index. According to the technical scheme provided by the invention, the hybrid filter composed of the low-pass filter and the piezoelectric resonator is adopted, and the coupling between the inductors can be effectively reduced through reasonable arrangement of the inductors, so the out-of-band rejection of the filter is improved; meanwhile, the piezoelectric resonator is used for replacing part of capacitors, so the roll-off of the filter is improved.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a filter, a manufacturing method thereof, a multiplexer and a communication device. Background technique [0002] In recent years, the mobile communication industry has flourished, and 5G has gradually entered people's lives. Mobile communication terminals represented by mobile phones have become an indispensable communication tool in people's daily life. With the increasingly crowded spectrum resources, the data throughput and power consumption requirements of terminals are getting higher and higher, which brings great challenges to the design of RF front-end circuits. [0003] At present, the small-sized filter devices that can meet the needs of communication terminals are mainly piezoelectric filters. The resonators that make up such filters mainly include: FBAR (Film Bulk Acoustic Resonator, thin film bulk acoustic resonator), SMR (Solidly Mounted Resonator , solid-state ass...

Claims

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Application Information

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IPC IPC(8): H03H3/02H03H3/04H03H9/17H03H9/56H03H9/70
CPCH03H3/02H03H3/04H03H9/176H03H9/562H03H9/70H03H2003/028H03H2003/0414
Inventor 郑云卓庞慰
Owner ROFS MICROSYST TIANJIN CO LTD