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A sound surface wave filter module

A surface acoustic wave and filter technology, applied in the field of electronics, can solve problems such as damage to the surface acoustic wave filter, difficulty in user compatibility and substitution, impedance parameter differences, etc. The effect of design workload

Inactive Publication Date: 2008-07-09
ZTE CORP
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  • Abstract
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Problems solved by technology

[0003] At present, the input and output impedances of most SAW filters are mismatched, which requires the user to match the input and output impedances during board design, which increases the design space of the board and the time for parameter debugging. Impedance parameters will be different, making it difficult for users to make compatible substitutions
[0004] In addition to the impedance mismatch, the surface acoustic wave filter has hidden dangers such as electrostatic damage, high-temperature welding damage, and DC feed-in damage due to its internal structure characteristics. Damage to part of the SAW filter

Method used

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  • A sound surface wave filter module
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Embodiment Construction

[0026] The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0027] The present invention provides a surface acoustic wave filter module, as shown in Fig. 1, comprising:

[0028] The input matching network 100 is used to match the impedance of the input port of the surface acoustic wave filter with the impedance of the radio frequency circuit interface; the phase matching means: the voltage standing wave ratio VSWR<1.5, and the calculation method of the voltage standing wave ratio is the same as the prior art. It can also be used to isolate the input port of the surface acoustic wave filter and provide a discharge channel for static electricity; including two ports, one port is connected to the input port of the surface acoustic wave filter, and the other port is used as the surface acoustic wave filter The input port of the module. When the surface acoustic wave filter module is used, the signal to...

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Abstract

The invention provides a surface acoustic wave filter module, comprising a surface acoustic wave filter which is used for carrying out frequency band filtering. The invention also comprises an input matching network which is used for being matched with input port impedance of the surface acoustic wave filter with radio frequency circuit interface impedance, two ports, one connected with a surface acoustic wave filter input port and the other taken as an output port of the surface acoustic wave filter. The invention realizes consistency of the surface acoustic wave filter impedance, ensures compatibility and substitution conveniently and rapidly and reduces the design workload of users.

Description

Technical field [0001] The invention relates to the field of electronics, in particular to a surface acoustic wave filter module. Background technique [0002] With the rapid development of wireless technology, surface acoustic wave filters are widely used in various wireless systems due to their excellent filtering characteristics, such as TV receivers and CATV systems; mobile and cordless telephone systems; optical fiber communication systems clock recovery ; Satellite communication and positioning (GPS) systems; spread spectrum communication systems; communication reconnaissance compression receivers; pulse compression radar systems; channelized receivers for electronic reconnaissance; response jammers; keyless entry and security alert systems; telemetry and remote control systems . Since the interface impedance of the radio frequency circuit is basically 50 ohms, the external input and output impedances of most component modules such as amplifiers, filters, duplexers, coupler...

Claims

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Application Information

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IPC IPC(8): H03H9/64H03H7/38
Inventor 范泉
Owner ZTE CORP
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