Reactance Filter Capacitor Layout for Intermodulation Suppression
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Solution Overview
Problem
Existing filter technologies face challenges in suppressing intermodulation products and harmonics due to saturation effects as the number of cascaded resonators increases, leading to larger area requirements and reduced effectiveness, which is economically and technically inefficient for miniaturization.
Innovation Solution
A filter circuit design that incorporates a voltage or current divider circuit using a linear capacitor in series or parallel with resonators to reduce the saturation effect, allowing for improved linearity and suppression of intermodulation products over a wide frequency range, while maintaining a moderate increase in resonator area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the number of cascaded resonators is increased to suppress intermodulation products, then the suppression effect is improved, but the area requirement increases and saturation effect occurs reducing effectiveness
Solution Approach 1:
A linear capacitor is introduced as an intermediary element in the parallel branch of the filter circuit. This capacitor works together with the resonators to provide voltage or current division, thereby reducing the saturation effect and improving intermodulation product suppression without requiring a proportional increase in filter area.
Solution Approach 2:
The invention changes the electrical parameters of the filter circuit by introducing a capacitor with specific capacitance value. This parameter change enables voltage or current division that reduces the saturation effect, allowing for better intermodulation suppression with moderate area increase.
2Object-generated harmful factors
If the number of cascaded resonators is increased to suppress intermodulation products, then the suppression effect is improved, but the device complexity increases
Solution Approach 1:
Rather than simply adding more resonators, the invention introduces a capacitor as an intermediary element that works with existing resonators to achieve better suppression. This approach improves performance while avoiding the linear increase in circuit complexity that would result from adding more resonators.
Solution Approach 2:
Instead of using excessive numbers of resonators to achieve suppression, the invention applies partial action by using a capacitor in combination with a moderate number of resonators. This achieves the required suppression effect without the excessive complexity of using many more resonators.
3Reliability
If the capacitance of capacitors is increased to maintain static capacitance in cascaded resonators, then the filter performance is maintained, but the area requirement becomes too large
Solution Approach 1:
The linear capacitor acts as an intermediary that enables voltage or current division, allowing the filter to maintain performance with smaller capacitor values. This reduces the area requirement while preserving the necessary static capacitance for proper filter operation.
Solution Approach 2:
The invention optimizes the capacitance parameter by introducing a capacitor with a specific value that enables voltage or current division. This parameter optimization allows maintaining filter performance with reduced capacitor area compared to traditional cascaded resonator designs.
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 filter circuit achieves significant reduction in intermodulation products and harmonics with a moderate increase in resonator area, maintaining transmission behavior and reducing the area requirement, thus balancing suppression and bandwidth.
Implementation Method 1
a first capacitor is interconnected in series or in parallel with the series interconnection of a plurality of resonators, the first case resulting in voltage division and the second case resulting in current division
Implementation Method 2
a first capacitor is interconnected in series or in parallel with the series interconnection of a plurality of resonators, the first case resulting in voltage division and the second case resulting in current division
Implementation Method 3
The capacitor mentioned is a preferred linear element
Data Source
AI summary
For a reactance filter constructed from serial and parallel resonators, in order to improve the linearity, it is proposed to connect a capacitor in series or in parallel either with a parallel resonator or a cascade of parallel resonators or with a series resonator or a cascade of series resonators.