Coupled Resonator Filter with Adjustable Capacitive Coupling
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Solution Overview
Problem
Miniaturization of electronic components in communication systems leads to increased internal interference signals, resulting in a decrease in noise signal inhibition rate and quality factor of filters, making it challenging to design filters with high quality factor and noise signal inhibition rate.
Innovation Solution
A coupled resonator filter with a first and second resonance unit, and a main adjustment unit comprising an adjustable capacitor, where the coupling coefficient between the units is adjusted by changing the capacitance, and a shielding conductive layer and columns are used to enhance frequency bandwidth control and noise signal inhibition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electronic components are miniaturized, then device size is reduced, but internal interference signals increase and quality factor decreases
Solution Approach 1:
The filter is divided into multiple resonant units (first resonant unit, second resonant unit, third resonant unit) that are coupled together. Each resonant unit operates at a different resonant frequency, allowing the filter to maintain high quality factor while being miniaturized. The segmentation of the filter into discrete resonant elements enables independent optimization of each unit's performance.
Solution Approach 2:
Coupling capacitors are introduced as intermediary elements between the resonant units to control the coupling coefficients. These coupling capacitors act as mediators that regulate the interaction between adjacent resonant units, allowing precise control over signal transmission while maintaining isolation to prevent internal interference. The coupling capacitors enable the miniaturized structure to achieve high quality factor by optimizing the coupling strength between units.
2Volume of moving object
If component size is reduced, then miniaturization is achieved, but noise signal inhibition rate decreases
Solution Approach 1:
Different resonant units are designed with distinct local characteristics (different resonant frequencies) to perform specialized functions. The first resonant unit operates at a first resonant frequency, the second at a second resonant frequency, and the third at a third resonant frequency. This local differentiation allows each unit to selectively pass or reject specific frequency components, maintaining high noise inhibition rate despite overall miniaturization.
Solution Approach 2:
The filter employs a composite structure combining multiple resonant units with different electrical characteristics, coupled through capacitive elements. This composite architecture integrates the advantages of different resonant frequency responses, creating a filter that simultaneously achieves miniaturization and high noise rejection capability through the synergistic interaction of its constituent units.
3Adaptability or versatility
If resonant units are coupled closely, then frequency bandwidth control is improved, but internal interference increases
Solution Approach 1:
The coupling coefficients between resonant units are made dynamically adjustable through the use of coupling capacitors with variable capacitance values. This dynamic control mechanism allows the filter to optimize the coupling strength between adjacent resonant units based on the desired frequency bandwidth, while simultaneously maintaining sufficient isolation to prevent internal interference. The variable coupling capability enables adaptive tuning of the filter's frequency response.
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 solution achieves high controllability of frequency bandwidth and a high inhibition rate of noise signals, effectively addressing the miniaturization-induced interference issues, with a reduced filter size, such as a height of less than 2 mm at 5 GHz operating frequency.
Implementation Method 1
main adjustment unit, being electrically connected between the first resonance unit and the second resonance unit, and comprising an adjustable capacitor; wherein by changing a capacitance of the adjustable capacitor, a coupling coefficient between the first resonance unit and the second resonance unit is adjusted
Implementation Method 2
first resonance unit, being coupled to an input end, and comprising: a first resonance inductor, being coupled to a ground unit by a first end thereof; and a first capacitor
Data Source
AI summary
A coupled resonator filter is disclosed. The coupled resonator filter is provided with high quality factor, and comprises: a first resonance unit, a second resonance unit and a main adjustment unit. In the present invention, the main adjustment unit is electrically connected between the first resonance unit and the second resonance unit, and comprises an adjustable capacitor. By changing a capacitance of the adjustable capacitor, a coupling coefficient between the first resonance unit and the second resonance unit is adjusted. As a result, the coupled resonator filter of the present invention included advantages of high controllability of the frequency bandwidth and high inhibition rate of noise signal.