Filter Device Resonator Segmentation for Attenuation
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Solution Overview
Problem
Existing filter devices struggle to effectively adjust passbands and improve attenuation characteristics in non-passbands, particularly in scenarios where frequency bands for radio communications are narrow and adjacent, leading to inefficiencies in signal transmission.
Innovation Solution
The filter device incorporates a resonator configuration with multiple resonant portions and intermediate ground electrodes, utilizing inductive coupling to generate attenuation poles and adjust passbands, thereby enhancing attenuation characteristics in non-passbands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional resonator configuration is used, then the device structure is simple, but the passband adjustment capability and attenuation characteristic in non-passband are insufficient
Solution Approach 1:
The resonator is divided into multiple resonant portions (first, second, third resonant portions) with different lengths, each contributing to different attenuation poles. This segmentation enables independent adjustment of attenuation characteristics at different frequency points, resolving the contradiction between achieving reliable attenuation and maintaining structural simplicity.
2Measurement precision
If the resonator length is increased to improve passband adjustment, then the filtering precision is improved, but the device size increases
Solution Approach 1:
Instead of extending the resonator length in a single dimension, the invention uses multiple resonant portions of different lengths arranged in a stacked configuration. This dimensional reorganization allows precise passband adjustment through the combined effect of multiple shorter resonant portions, achieving high filtering precision without excessive device size.
3Manufacturing precision
If multiple resonant portions with different lengths are used, then the attenuation poles can be precisely controlled, but the manufacturing complexity increases
Solution Approach 1:
The multiple resonant portions are arranged in a nested or stacked configuration where they share common ground electrodes and coupling structures. This nesting approach allows precise control of attenuation pole positions while reducing the number of independent manufacturing steps, as the resonant portions can be fabricated together as an integrated structure.
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
This configuration allows for precise adjustment of passbands and significant improvement in attenuation characteristics on both lower and higher frequency sides, reducing signal loss and improving filtering efficiency.
Implementation Method 1
a first resonator connected to either one of the input terminal and the output terminal. The first resonator includes a first intermediate ground electrode, a first resonant portion, a second resonant portion, and a third resonant portion
Implementation Method 2
at least one intermediate resonator coupled to at least one of the first resonator and the second resonator by inductive coupling
Data Source
AI summary
A filter device includes input and output terminals, first and second ground electrodes opposed to each other, and a resonator connected to one of the input and output terminals. The resonator includes a third ground electrode, and first, second, and third resonant portions. The third ground electrode is between and connected to the first and second ground electrodes. The first resonant portion is between the first and third ground electrodes, and connected to the third ground electrode and one of the input and output terminals. The second resonant portion is between the first and third ground electrodes, and connected to the third ground electrode. The third resonant portion is between the second and third ground electrodes, and connected to the third ground electrode.