Coil-Cavity Filter Circuit for 5G Interference Above 700 MHz
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Solution Overview
Problem
Existing filters for suppressing 5G signal interference are either large in volume, high in cost, or have poor suppression effects on frequencies above 700 MHz, failing to meet user needs and being difficult to debug.
Innovation Solution
A high-frequency filter circuit using a coil disposed in a conductive isolating cavity as both an inductor and a capacitor, with dielectrics forming a new-type capacitor, allowing for better suppression of frequencies above 700 MHz, reduced volume, and easier debugging by adjusting the coil tension, and multiple circuits connected in parallel for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cavity filter is used to suppress 5G signal interference, then the suppression effect is improved, but the housing volume becomes large and debugging becomes difficult and costly
Solution Approach 1:
The patent combines the inductor and capacitor functions into a single coil structure. The coil serves dual purposes: it acts as the inductive element and simultaneously forms a capacitive structure with the conductive cavity walls, eliminating the need for separate LC components and reducing overall filter volume
Solution Approach 2:
The coil structure performs multiple functions: it provides inductance for the filter circuit, acts as one electrode of the capacitor, and works with the conductive cavity to form the resonant system. This multi-functionality reduces the number of components needed
2Reliability
If a cavity filter is used to suppress 5G signal interference, then the suppression effect is improved, but the debugging cost and difficulty increase
Solution Approach 1:
The patent makes the coil tension adjustable, allowing the inductance value to be dynamically changed. This enables easy debugging and tuning of the filter's resonant frequency by simply adjusting the coil tension, without requiring complex recalibration procedures
Solution Approach 2:
The patent changes the physical parameter of the coil (tension) to adjust the electrical parameter (inductance). By varying the mechanical tension on the coil, the inductance value changes, allowing straightforward adjustment of the filter characteristics during debugging
3Ease of manufacture
If ordinary LC filtering is used to suppress 5G signal interference, then the cost is reduced, but the Q values are not high and adjacent-frequency suppression effect is poor
Solution Approach 1:
The patent merges the inductor and capacitor into a single integrated coil structure that forms an LC resonant circuit. This unified structure achieves high Q values because the coil and its associated capacitive structure are optimized together as a resonant system, providing superior adjacent-frequency suppression compared to separate LC components
Solution Approach 2:
The patent creates a simplified version of the cavity filter by using the coil structure itself to form the capacitive element, rather than using complex separate LC components. This copied approach maintains the high Q value benefit of resonant circuits while reducing component count and cost
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 provides effective suppression of 5G signal interference with improved miniaturization, lower debugging costs, and enhanced performance compared to traditional LC filters, ensuring better signal quality and compatibility with television signals in 5G environments.
Implementation Method 1
a high-frequency filter circuit that uses a coil hung and disposed in a conductive isolating cavity as an inductor
Implementation Method 2
uses a combination of the conductive isolating cavity, dielectrics in the conductive isolating cavity, and the coil as a capacitor
Data Source
AI summary
A filter for suppressing 5G signal interference comprises a high-frequency filter circuit that uses a coil hung and disposed in a conductive isolating cavity as an inductor and that uses a combination of the conductive isolating cavity, dielectrics in the conductive isolating cavity, and the coil as a capacitor. A new-type filter circuit comprises a conductive isolating cavity, dielectrics in the conductive isolating cavity, and a coil hung and disposed in the conductive isolating cavity. The coil itself is an inductor in a high-frequency filter circuit, the coil and the conductive isolating cavity further form two conductors close to each other, and air media in relatively small space between the two conductors form non-conductive insulated media, to jointly form a new-type capacitor. That is, the coil in the high-frequency filter circuit is both an inductor and a conductor that forms a capacitor.