Acoustic Wave Filter Layout Using Ultrasonic Delay Electrodes for Isolation
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Solution Overview
Problem
Existing acoustic wave devices require complex configurations to improve isolation characteristics, often necessitating additional circuits that complicate their design.
Innovation Solution
An acoustic wave device with a simpler configuration that includes a first and second filter, ground and common terminals, ultrasonic delay electrodes, and capacitors, which are connected in a specific arrangement to enhance isolation characteristics without the need for additional circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional circuit is added to improve isolation characteristics, then isolation characteristics are improved, but device complexity increases
Solution Approach 1:
The patent combines the isolation function with the existing filter structure by introducing an ultrasonic delay electrode that couples the input and output sides of the filter. This merging approach integrates the isolation mechanism into the filter itself rather than adding a separate isolation circuit, thereby improving isolation characteristics while avoiding increased device complexity
Solution Approach 2:
The ultrasonic delay electrode acts as an intermediary element between the input and output sides of the filter. It provides a controlled coupling path that enables signal transmission while simultaneously creating the phase difference necessary for isolation improvement, serving dual purposes without requiring additional independent circuits
2Reliability
If ultrasonic delay electrodes are added to improve isolation, then isolation characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the filter structure into distinct functional regions (input side, output side, and ultrasonic delay electrode region) that can be independently designed and manufactured. The ultrasonic delay electrode is implemented as a separate component that can be added to existing filter designs without requiring complete redesign of the manufacturing process
Solution Approach 2:
The ultrasonic delay electrode serves multiple functions simultaneously: it provides signal coupling between input and output sides, creates the necessary phase difference for isolation improvement, and can be integrated into various filter configurations. This multi-functionality reduces the need for additional specialized components and simplifies manufacturing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed configuration effectively improves isolation characteristics by delaying signal phases and cancelling noise signals, achieving desired attenuation and insertion loss levels with a more straightforward design.
Implementation Method 1
an input side ultrasonic delay electrode connected to an input side metal body arranged in parallel with the ground electrode on one side of the ground electrode and includes the first filter terminal or a wiring connected to the first filter terminal, an output side ultrasonic delay electrode connected to an output side metal body arranged in parallel with the ground electrode on another side of the ground electrode and includes the common terminal or a wiring connected to the common terminal
Data Source
AI summary
An acoustic wave device includes a first filter, a second filter, a ground terminal, a common terminal connected to an output side of the first filter and an input side of the second filter, a first filter terminal connected to an input side of the first filter, a second filter terminal connected to an output side of the second filter, a ground electrode connected to a metal body for ground that includes the ground terminal or a wiring connected to the ground terminal, an input side ultrasonic delay electrode connected to an input side metal body arranged in parallel with the ground electrode on one side of the ground electrode, an output side ultrasonic delay electrode connected to an output side metal body arranged in parallel with the ground electrode on another side of the ground electrode.