Tunable Acoustic Filter Assembly for Adjacent RF Band Separation
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Solution Overview
Problem
Existing RF front-end modules struggle to efficiently manage the transition band between unlicensed and licensed frequency bands, leading to inefficient spectrum usage and potential self-interference in devices supporting multiple wireless technologies.
Innovation Solution
A tunable band-pass filter assembly with a control interface that adjusts the transition band frequency to optimize spectrum usage based on traffic demands, using reactive elements and RF cancellation techniques to maintain filter performance without reducing the transition band width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed band-pass filter is used to separate unlicensed and licensed frequency bands, then the filter structure is simple and stable, but the transition band cannot be adjusted leading to spectrum waste and self-interference
Solution Approach 1:
The filter assembly incorporates a tunable band-pass filter with a transition band that can be dynamically adjusted between a first position (aligned with unlicensed band boundary) and a second position (aligned with licensed band boundary). This dynamic positioning allows the filter to adapt to different spectrum usage scenarios, resolving the contradiction between fixed structure simplicity and transition band adjustability.
Solution Approach 2:
The filter assembly is designed to perform multiple functions: it can operate with the transition band at different positions to support both unlicensed and licensed band operations. The same filter structure serves both as a fixed filter and a tunable filter, eliminating the need for separate filters for different band configurations and reducing overall system complexity.
2Object-affected harmful factors
If the transition band width is reduced to minimize self-interference, then self-interference is reduced, but spectrum utilization efficiency decreases
Solution Approach 1:
Rather than reducing the transition band width, the invention dynamically positions the transition band at its widest effective width at either the unlicensed band boundary or the licensed band boundary. This dynamic positioning ensures that the full spectrum resources are utilized while the transition band is strategically placed to minimize self-interference, resolving the contradiction between interference reduction and spectrum efficiency.
Solution Approach 2:
The system changes the position parameter of the transition band rather than its width parameter. By adjusting the transition band position between two extreme positions (first position at unlicensed band boundary, second position at licensed band boundary), the system achieves minimal self-interference while maintaining optimal spectrum utilization, avoiding the trade-off between width reduction and efficiency loss.
3Reliability
If reactive elements are added to maintain filter performance during tuning, then filter performance is maintained, but the device complexity increases
Solution Approach 1:
The tunable band-pass filter uses reactive elements to change the electrical parameters (capacitance or inductance) of the filter circuit, which in turn adjusts the transition band position. This parameter change approach allows performance maintenance through controlled electrical adjustments rather than mechanical or structural modifications, achieving reliable tuning with minimal additional complexity.
Solution Approach 2:
The invention replaces mechanical or physical结构调整 with electrical parameter adjustment using reactive elements. Instead of mechanically reconfiguring the filter structure to maintain performance during tuning, the system uses electrical components (capacitors or inductors) to dynamically adjust the filter characteristics, simplifying the overall device architecture while maintaining performance consistency.
4Adaptability or versatility
If a tunable filter is implemented to dynamically shift the transition band, then spectrum flexibility is improved, but the control system complexity increases
Solution Approach 1:
The control interface is designed with multi-functionality, serving both to tune the transition band position and to coordinate with the radio frequency module for optimal spectrum usage. This universal control mechanism handles multiple functions (filter tuning, spectrum management, interference coordination) through a single interface, reducing the need for separate control systems and minimizing overall control complexity while maximizing spectrum flexibility.
Data Source
AI summary
An acoustic filter assembly for operating at a first band adjacent to a second band without a spacing between the first band and the second band is presented, including a band-pass filter configured have a transition band between the passband and a stopband; and an interface configured to receive a control signal that controls a width of the pass band such that the transition band is shifted in frequency, the control signal adjusting a location of the transition band between a first position and a second position, one end of the transition band near to the stopband being aligned with a boundary between the first band and the second band in the first position, the other end of the transition band near to the pass band being aligned with the boundary between the first band and the second band in the second position.