Switchable Filter Device for Multi-Band Multiplexer Miniaturization
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Solution Overview
Problem
Existing multiplexers for multi-band communication become increasingly large as the number of frequencies used increases, due to the need for multiple filters with different pass bands, which complicates their design and size.
Innovation Solution
A filter device with a switchable configuration that includes a series arm resonator and filter circuits, allowing the same filter circuits to function as different filters by switching the connection paths, thereby reducing the overall size while enabling multi-band communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple filters with different pass bands are connected in common to provide multi-band communication, then multi-band communication capability is improved, but the size of the multiplexer increases
Solution Approach 1:
The patent makes a single filter circuit serve multiple frequency bands by using switching elements to reconfigure its connection topology. The filter circuit can be switched between different pass bands (e.g., first pass band including first and second frequencies, second pass band including third and fourth frequencies), allowing one filter to perform the function of multiple filters would traditionally be needed, thereby reducing the overall multiplexer size while maintaining multi-band capability
Solution Approach 2:
The patent introduces switching elements that dynamically reconfigure the filter circuit's connection state based on the desired frequency band. The switching elements can change the filter circuit between a connected state (included in the pass band) and a disconnected state (excluded from the pass band), enabling adaptive frequency selection and reducing the need for multiple static filter components
2Adaptability or versatility
If the number of filters connected in common increases with the increase in the number of frequencies, then multi-band communication support is improved, but the device complexity increases
Solution Approach 1:
The patent makes a single filter circuit serve multiple frequency bands by using switching elements to reconfigure its connection topology. The filter circuit can be switched between different pass bands (e.g., first pass band including first and second frequencies, second pass band including third and fourth frequencies), allowing one filter to perform the function of multiple filters would traditionally be needed, thereby reducing the overall multiplexer size while maintaining multi-band capability
Solution Approach 2:
The patent introduces switching elements that dynamically reconfigure the filter circuit's connection state based on the desired frequency band. The switching elements can change the filter circuit between a connected state (included in the pass band) and a disconnected state (excluded from the pass band), enabling adaptive frequency selection and reducing the need for multiple static filter components
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 allows for miniaturization of filter devices and multiplexers while maintaining multi-band communication capabilities, as the same filter circuits can be used to create filters with different pass bands, reducing the number of components needed and enhancing flexibility in frequency support.
Implementation Method 1
a first series arm resonator... at least one filter circuit is connected to one end of the first series arm resonator... the first filter includes the first series arm resonator and the at least one filter circuit
Data Source
AI summary
A filter device includes a terminal, a switch that includes a common terminal and selection terminals and switches a connection of the common terminal to one of the selection terminals, a series arm resonator, and filter circuits. The filter circuits are connected to one end of the series arm resonator. The common terminal is connected to the terminal. One of the selection terminals is connected between one end of the series arm resonator and the filter circuits. Another one of the selection terminals is connected to the other end of the series arm resonator.