Duplexer Device with Switchable Band-Stop Filter for Overlapping Bands
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Solution Overview
Problem
The increasing number of frequency bands used in communication devices leads to overlapping with other communication systems' bands, necessitating multiple duplexers with different filter characteristics, which complicates the design and increases the size of handheld terminals due to the need for band-stop regions and complex switching mechanisms.
Innovation Solution
A duplexer device with an antenna terminal, transmission terminal, and reception terminal, incorporating a band-stop filter connected via a switch to suppress specific frequency bands, allowing for dynamic switching to prevent interference with overlapping bands from other communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple duplexers with different filter characteristics are installed to handle overlapping frequency bands, then the ability to suppress interfering signals is improved, but the device complexity and size increase
Solution Approach 1:
A single duplexer is designed to perform multiple functions by dynamically switching its filter characteristics. The duplexer can operate in different modes (first filter characteristic for suppressing interfering signals, second filter characteristic for normal operation) depending on whether an interfering signal is detected, eliminating the need for multiple dedicated duplexers
Solution Approach 2:
The duplexer transitions from a static filter configuration to a dynamic one where the filter characteristics can be changed in real-time. A controller detects interfering signals and switches the duplexer between different filter characteristics, allowing the system to adapt to changing electromagnetic environments without increasing hardware complexity
2Reliability
If multiple duplexers with different filter characteristics are installed to handle overlapping frequency bands, then the ability to suppress interfering signals is improved, but the terminal size increases
Solution Approach 1:
One duplexer is designed to perform multiple functions by dynamically switching its filter characteristics. The duplexer can operate in different modes (first filter characteristic for suppressing interfering signals, second filter characteristic for normal operation) depending on whether an interfering signal is detected, eliminating the need for multiple dedicated duplexers and reducing terminal size
Solution Approach 2:
The patent combines the functionality of multiple duplexers into a single device. By integrating switching capability and multiple filter characteristics within one duplexer, the system achieves the signal suppression capability of multiple duplexers while occupying the space of only one, thereby reducing the overall terminal size
3Object-affected harmful factors
If a band-stop filter is selectively connected to suppress overlapping frequency bands, then interference with other communication systems is reduced, but the device complexity increases due to switching mechanisms
Solution Approach 1:
The band-stop filter functionality is extracted as a separate, selectively connectable component rather than being permanently integrated into the duplexer. This allows the filter to be connected only when interfering signals are detected, reducing unnecessary complexity during normal operation while providing suppression capability when needed
Solution Approach 2:
The switching mechanism is designed to be simple and dynamic, connecting the band-stop filter only when required. The controller detects interfering signals and activates the switch to connect the filter, creating a simple on-demand switching system rather than a permanently complex switched architecture
Data Source
AI summary
A problem is improved in which a plurality of duplexers has to be used if at least one of a transmission band and reception band for a handheld terminal partially overlaps a frequency band used in another communication system. A duplexer device includes a duplexer configured to include an antenna terminal, a transmission terminal and a reception terminal and to have a specific transmission band and reception band and a band-stop filter connected to at least one of the antenna terminal, the transmission terminal and the reception terminal via a switch and configured to suppress some of at least one of the specific transmission band and reception band in response to the switching of the switch.