Check patentability & draft patents in minutes with Patsnap Eureka AI!

Elastic wave filter

An elastic wave filter and resonator technology, applied in electrical components, impedance networks, etc., can solve the problems of fine-tuning the resonant frequency and anti-resonant frequency of the first series arm resonator, and it is difficult to reduce the insertion loss of the passband, so as to reduce the insertion loss. The effect of loss

Pending Publication Date: 2021-06-29
MURATA MFG CO LTD
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the elastic wave filter disclosed in Patent Document 1, it is difficult to fine-tune the resonance frequency and antiresonance frequency of the first series arm resonator, and it is difficult to reduce the insertion loss (loss) on the high frequency side within the passband.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Elastic wave filter
  • Elastic wave filter
  • Elastic wave filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0049] [1. Basic structure of elastic wave filter]

[0050] figure 1 It is a circuit configuration diagram of the elastomeric wave filter 10 according to the embodiment.

[0051] The elastic wave filter 10 includes a plurality of series arms 101, 102, and 103 disposed on the path coupled to the first terminal 91 and the second terminal 92 and the above path and the ground (reference terminal). Parallel arm resonator 202 and 203. The series arm resonator 102 is disposed between the first terminal 91 and the series arm resonator 101, and the series arm resonator 103 is disposed between the series arm resonator 101 and the second terminal 92.

[0052] Hereinafter, the series arm resonator 101 in the plurality of series arm resonators 101 to 103 is sometimes referred to as the first series arm resonator 101, and the series arm resonator 102, 103 different from the first series arm resonator 101 is referred to. The second series arm resonator 102, 103.

[0053] As shown in the figure,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Provided is an elastic wave filter capable of reducing insertion loss on the high-frequency side in a passband. The elastic wave filter (10) includes a first resonance circuit (RC1) including a first series arm resonator (101) and a first capacitive element (C1). The first series arm resonator is provided on a path connecting a first terminal (91) and a second terminal (92). The first capacitive element is coupled in parallel with the first series arm resonator. The first series arm resonator includes a first divided resonator (D1) and a second divided resonator (D2) coupled in series with each other. The first resonance circuit includes a second resonance circuit (RC2) including the first divided resonator and a second capacitive element (C2) coupled in parallel with the first divided resonator. One terminal of the second capacitor element is connected to one node (n4) between the first divided resonator and the second divided resonator, and the other terminal is connected to another node (n3) located on the opposite side of the first divided resonator from the one node.

Description

Technical field [0001] The present invention relates to an elastic wave filter. Background technique [0002] Incidentally, a ladder elastic wave filter comprising a series arm resonator and a parallel arm resonator is known. As an example of such an elastic wave filter, a resilient wave filter is disclosed in Patent Document 1, which includes a first series arm resonator; a second series arm resonator, connected to the first series arm resonator And the parallel arm resonator is connected to the node between the first series arm resonator and the second series arm resonator. In the elastic wave filter, a capacitive element is connected in parallel in the first series arm resonator. [0003] Prior art [0004] Patent document [0005] Patent Document 1: U.S. Patent No. 6,593,678 [0006] As in the elastic wave filter disclosed in Patent Document 1, the anti-resonant frequency of the first series arm resonator that can be connected in parallel to the low frequency side by connecti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/64H03H9/145
CPCH03H9/64H03H9/145H03H9/6483H03H9/725H03H9/14502H03H9/02543H03H9/25
Inventor 高桥彻山路彻葛下琢真
Owner MURATA MFG CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com