Dual-Sided Switchable RF Filter for Low-Loss Band Selection
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Solution Overview
Problem
Existing RF filters require multiple switches for frequency band switching, leading to increased insertion loss, higher costs, and reduced performance due to the need for separate filters for each frequency band.
Innovation Solution
A switchable filter design with a frequency band switching unit that includes a filter unit with two filter groups and a switching mechanism using resonance bar tuning screws and short pin modules, allowing for seamless switching between frequency bands without the need for additional RF switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple RF switches are installed for frequency band switching in filter assemblies, then frequency band switching capability is achieved, but insertion loss increases and PIMD level deteriorates
Solution Approach 1:
The patent merges the frequency band switching function into the duplexer structure by integrating a frequency band switching unit that can switch between first and second frequency bands. This consolidation eliminates the need for separate RF switches for each filter assembly, thereby reducing the total number of switches and improving RF characteristics by lowering insertion loss and PIMD levels.
Solution Approach 2:
The duplexer is designed with multi-functionality to perform both duplexing (separating transmission and reception signals) and frequency band switching. The frequency band switching unit integrated into the duplexer can switch between different frequency bands, allowing a single device to fulfill multiple functions that previously required separate components.
2Adaptability or versatility
If the number of RF switches is increased to support more filter assemblies, then frequency band coverage is expanded, but cost increases
Solution Approach 1:
The patent combines multiple functions (duplexing and frequency band switching) into a single integrated structure. By merging the frequency band switching unit into the duplexer, the system achieves expanded frequency band coverage without proportionally increasing the number of RF switches, thereby controlling manufacturing costs.
Solution Approach 2:
The integrated duplexer with frequency band switching capability serves as a universal component that can handle multiple frequency bands and filter assemblies. This multi-functional design reduces the overall component count and associated costs while maintaining expanded frequency band coverage.
3Reliability
If separate filters are produced for each frequency band, then filtering performance for specific bands is optimized, but device complexity and replacement requirements increase
Solution Approach 1:
The patent combines multiple filter groups (first filter group for first frequency band, second filter group for second frequency band) into a single integrated filter assembly with a shared duplexer structure. This merging allows optimized filtering performance for multiple bands while reducing the number of separate filter assemblies and simplifying the overall device architecture.
Solution Approach 2:
The integrated filter assembly with multiple filter groups and frequency band switching capability serves as a universal solution that provides optimized filtering performance across different frequency bands. This multi-functional design eliminates the need for separate filter assemblies for each band, reducing device complexity and replacement requirements.
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
Improves RF characteristics by enabling efficient frequency band selection and reducing costs by eliminating the need for multiple RF switches, while maintaining high performance across different frequency bands.
Implementation Method 1
a band-pass frequency of an RF filter is determined by an inductance component and a capacitance component of the filter, and as described above, a work for adjusting the band-pass frequency of the filter is called tuning
Implementation Method 2
a band-pass frequency of an RF filter is determined by an inductance component and a capacitance component of the filter
Implementation Method 3
a band-pass frequency of an RF filter is determined by an inductance component and a capacitance component of the filter
Implementation Method 4
a first filter side short unit configured to come in contact with the resonance bar tuning screw of the first filter group while moving to be adjacent to the one surface of the filter body, and to be spaced apart from the resonance bar tuning screw while moving to be spaced apart from the one surface of the filter body
Data Source
AI summary
The present invention relates to a switchable filter comprising: a filter unit in which a first filter group for filtering the frequency of a first frequency band is provided on one surface thereof and a second filter group for filtering the frequency of a second frequency band is provided on the other surface thereof on the basis of a center partition wall; and a frequency band switching unit, which moves to be adjacent to or separated from the one surface or the other surface of the filter unit, and thus converts a frequency band into the first frequency band or the second frequency band. Therefore, the deterioration of RF characteristics is prevented and selective conversion between frequency bands is facilitated.