RF Combiner Resonator Layout for Multi-Band Signal Isolation
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Solution Overview
Problem
Existing radio-frequency (RF) applications face challenges in efficiently routing signals with multiple frequency components between separate paths or from separate paths to a common path, particularly in achieving ideal impedance states for carrier aggregation operations.
Innovation Solution
A radio-frequency architecture that includes a first group of filters supporting a first frequency range and a second group of filters supporting a second frequency range, with each filter providing near-short circuit impedance for signals in the other group's frequency range, and a coupling circuit with a resonator to exclude signals from one path when they are present in the other path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filters are configured to provide near-short circuit impedance for signals in other groups' frequency ranges, then signal isolation between frequency paths is improved, but device complexity increases due to the need for multiple filters and coupling circuits
Solution Approach 1:
The RF architecture is segmented into multiple independent filter groups, where each filter group handles a specific frequency range. This segmentation allows each filter to be optimized for its designated band while providing impedance isolation for other bands, achieving signal isolation without requiring a single complex filter to handle all frequencies.
Solution Approach 2:
The coupling circuit is nested within the RF architecture, integrating the isolation function directly into the signal path. The coupling circuit with resonators is embedded between filter groups, creating a compact structure where the coupling circuit's impedance characteristics provide additional isolation while maintaining a streamlined overall design.
2Reliability
If a coupling circuit with resonator is used to exclude signals from one path, then signal exclusion efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The resonators in the coupling circuit are designed with specific resonant frequencies that correspond to the frequency ranges of the filter groups. By tuning the resonant parameters of these resonators, the coupling circuit achieves effective signal exclusion at target frequencies while maintaining tolerance to manufacturing variations through parameter optimization.
3Adaptability or versatility
If multiple filter groups support different frequency ranges, then adaptability for carrier aggregation is improved, but loss of energy increases due to impedance mismatches
Solution Approach 1:
The coupling circuit acts as an intermediary between filter groups supporting different frequency ranges. Its resonators are designed to present high impedance to signals in frequency ranges not intended for that path, effectively blocking unwanted signals while maintaining low insertion loss for intended signals. This intermediary structure enables multi-band carrier aggregation while minimizing energy loss through optimized impedance matching.
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 effectively isolates signals between different frequency paths, ensuring that signals in one path are excluded from the other, thereby enhancing the efficiency of carrier aggregation operations.
Implementation Method 1
The coupling circuit includes a resonator such that the impedance provided by each filter of the first group for the signal in each band of the second group results in the signal being sufficiently excluded from the first path
Data Source
AI summary
A radio-frequency architecture can include a first circuit configured to support a first frequency range, and a second circuit configured to support a second frequency range. The first circuit can be further configured to provide an impedance at or near a short circuit impedance for a signal in the second frequency range, the second circuit can be further configured to provide an impedance at or near a short circuit impedance for a signal in the first frequency range. The architecture can further include a coupling circuit having a common node and configured to couple the common node to the first circuit and to couple the common node to the second circuit. The coupling circuit can include a resonator such that the signal in the second frequency range is sufficiently excluded from the first circuit, and the signal in the first frequency range is sufficiently excluded from the second circuit.