Tunable RF Filter Control for Multi-Band 5G Signal Loss
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Solution Overview
Problem
Conventional RF circuits with fixed filters are unable to tune to different frequency bands, leading to performance compromises in 5G communication systems, particularly in mmWave bands, due to fixed design margins that fail to adequately cope with varying operational conditions.
Innovation Solution
A tunable RF circuit structure that includes a switch, low noise amplifier, power amplifier, fixed filter, and tunable filter, where a processor detects signal strength and adjusts the tunable filter to pass or attenuate specific frequency bands based on operational requirements, minimizing insertion loss and achieving optimal performance across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed filter is used in the RF circuit, then the circuit can be designed with sufficient attenuation margin for the initial design conditions, but the circuit can only pass one designated frequency band and cannot cope with varying operational situations
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed filter with a tunable filter whose frequency characteristics can be dynamically adjusted. The tunable filter includes variable capacitors that can be controlled by a controller to change the passband and stopband frequencies according to different operational conditions, enabling the RF circuit to adapt to varying frequency requirements while maintaining reliable attenuation performance.
Solution Approach 2:
The patent implements parameter changes by modifying the electrical parameters of the filter circuit. Specifically, the capacitance values of variable capacitors are changed under control signals to shift the resonant frequencies and impedance characteristics of the filter, thereby tuning the frequency band that is passed or attenuated. This allows the same physical circuit to achieve different frequency responses without hardware changes.
2Reliability
If the RF circuit is designed with sufficient attenuation margin for initial conditions, then reliability is improved, but the performance is compromised because only one designated frequency band may be passed
Solution Approach 1:
The patent makes the filter characteristics dynamic by incorporating variable capacitors that can be electronically tuned. The controller adjusts the capacitance values based on the operational situation, allowing the filter to maintain adequate attenuation margin for the currently active frequency band while enabling switching between multiple frequency bands. This dynamic adjustment resolves the conflict between maintaining reliable attenuation and achieving operational flexibility.
3Device complexity
If conventional RF circuits with fixed filters are used, then the circuit structure is simple, but the circuits fail to adequately tune to different frequencies in 5G systems
Solution Approach 1:
The patent achieves frequency tuning capability by changing the electrical parameters of the filter circuit through variable capacitors. These capacitors can be controlled to adjust the resonant frequencies and impedance matching, enabling the same physical circuit structure to operate across multiple frequency bands required for 5G communication. The parameter changes are achieved through electronic control without fundamentally altering the circuit topology.
4Reliability
If the filter is designed to achieve trade-offs between insertion loss of the pass frequency band and attenuation of the stop frequency band, then performance is optimized for specific conditions, but the filter cannot adequately tune the IL or attenuation in accordance with actual operational situation
Solution Approach 1:
The patent makes the filter performance dynamic by using variable capacitors that can be adjusted according to operational conditions. The controller monitors the operational situation and adjusts the capacitance values to optimize the trade-off between insertion loss in the passband and attenuation in the stopband for each specific frequency band being used. This dynamic optimization allows the filter to maintain best-in-class performance across multiple operating scenarios rather than being fixed for a single condition.
Data Source
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AI summary
An embodiment of the disclosure provides a tunable radio frequency (RF) circuit, a control method, and an electronic device including the same. An electronic device according to an embodiment of the disclosure may include an antenna, a transceiver, a tunable radio frequency (RF), and at least one processor operatively coupled with the transceiver and the tunable RF circuit. The tunable RF circuit may further include a switch, a low noise amplifier (LNA), a power amplifier (PA), a fixed filter configured to pass signals in a first frequency band, and attenuate signals in a second frequency band at least one tunable filter configured to pass signals in at least a portion of the second frequency band, where the portion of the second frequency band is tunable, and at least one detector configured to detect a signal strength passing through the at least one tunable filter.