High Pass Filter Attenuation Pole Positioning via Capacitor Asymmetry
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Solution Overview
Problem
Existing high pass filters with LC series resonators face challenges in bringing attenuation poles close to each other without disrupting symmetry or increasing device size, as altering inductor shapes affects bandpass characteristics and symmetry, and adding impedance matching components enlarges the device.
Innovation Solution
The design includes a high pass filter configuration with LC series resonators and additional capacitors strategically placed between inductor electrodes, reducing magnetic coupling and maintaining symmetry, allowing for closer attenuation poles without increasing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the shape of one of the inductors is changed to adjust the inductance value, then the attenuation poles can be brought close to each other, but the symmetric structure of the high pass filter is broken
Solution Approach 1:
The patent applies asymmetry principle by intentionally introducing a slight asymmetry in the capacitor configuration (different capacitance values C1 and C2) to achieve the desired attenuation pole positioning while maintaining overall structural balance. This controlled asymmetry allows the attenuation poles to be brought close together without requiring inductor shape modification.
2Stability of the object's composition
If an inductor or capacitor for impedance matching is added to the high pass filter, then the symmetry can be maintained, but the device size increases
Solution Approach 1:
The existing capacitors C1 and C2 in the circuit serve dual functions: they determine the attenuation pole positions and simultaneously provide impedance matching. This eliminates the need for additional dedicated impedance matching components, thereby maintaining symmetry without increasing device size.
Solution Approach 2:
The patent merges the functions of attenuation pole control and impedance matching into the same capacitor elements. By carefully selecting the capacitance values of C1 and C2, both the attenuation pole positioning and impedance matching requirements are satisfied by the same components, avoiding additional device volume.
3Manufacturing precision
If the inductor shape is modified to adjust inductance, then the bandpass characteristic changes, but the symmetry of input and output is destroyed
Solution Approach 1:
The patent applies local quality principle by making localized adjustments to the capacitor values (C1 and C2) rather than modifying the inductor shapes. This localized change in capacitor parameters allows precise control of the bandpass characteristic and attenuation pole positioning while preserving the overall symmetric structure and input-output symmetry.
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 effectively brings attenuation poles closer together while maintaining symmetry and reducing device size, enhancing the bandpass characteristic without compromising the inductor's quality factor or symmetry.
Implementation Method 1
additional capacitors strategically placed between inductor electrodes, reducing magnetic coupling
Implementation Method 2
high pass filter configuration with LC series resonators
Implementation Method 3
LC series resonators including inductors and capacitors
Implementation Method 4
LC series resonators including inductors and capacitors
Data Source
AI summary
A high pass filter includes a first LC series resonator including a first end connected to a signal path, and a second end connected to at least one ground terminal, a second LC series resonator including a third end electrically connected to the signal path, and a fourth end connected to the at least one ground terminal, and a third capacitor between a first portion extending from a first capacitor to a first inductor and a second portion extending from a second capacitor to a second inductor.