Multiband Booster Feedback Cancellation via Intermediary Circuit
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Solution Overview
Problem
Existing signal boosters face challenges with antenna-to-antenna feedback and wideband multiband repeaters, where feedback cancellation is difficult due to wideband signals and the need for multiple feedback cancellation circuits, leading to inefficiencies and increased complexity.
Innovation Solution
Implementing a bi-directional repeater system with feedback cancellation integrated circuits that reduce antenna-to-antenna feedback by generating cancellation signals within the signal path, rather than at the antenna ports, and using a multiband architecture that allows for simultaneous operation of multiple bands with shared or separate feedback cancellation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple feedback cancellation circuits are used for wideband multiband repeaters, then feedback cancellation effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal feedback cancellation circuit that can operate across multiple frequency bands simultaneously. This single circuit is designed to handle wideband signals spanning multiple bands, eliminating the need for separate feedback cancellation circuits for each band. The circuit achieves multi-functionality by processing wideband feedback signals that contain information from multiple bands, thereby reducing overall device complexity while maintaining effective feedback cancellation across all bands.
2Object-affected harmful factors
If feedback cancellation is implemented at antenna ports, then feedback reduction is achieved, but system complexity and cost increase
Solution Approach 1:
The patent introduces an intermediary approach by implementing feedback cancellation at the RF amplifier stage rather than directly at the antenna ports. This intermediary location allows the feedback cancellation circuit to process feedback signals after they have been amplified but before they are re-transmitted. This approach effectively reduces antenna-to-antenna feedback while avoiding the complexity and cost associated with direct antenna port intervention, such as complex antenna coupling structures or active cancellation at the antenna level.
3Measurement precision
If separate feedback cancellation circuits are used for each band, then band-specific optimization is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent merges the feedback cancellation functionality into a single unified circuit that handles multiple bands simultaneously. Instead of manufacturing separate feedback cancellation circuits for each frequency band, the invention combines all band handling into one circuit architecture. This merging approach simplifies manufacturing processes, reduces component count, and lowers production costs while still achieving effective feedback cancellation across all bands through the unified wideband processing capability.
Data Source
AI summary
A technology is described for feedback cancellation in a multiband booster. The repeater can comprise: a server antenna port; a donor antenna port; a first direction amplification and filtering path coupled between the server antenna port and the donor antenna port; a second direction amplification and filtering path coupled between the server antenna port and the donor antenna port; a first-direction two-antenna feedback cancellation circuit coupled between the server antenna port and the donor antenna port to reduce antenna-to-antenna feedback for a single band in a first direction between a donor antenna and a server antenna; and a second-direction two-antenna feedback cancellation circuit coupled between the server antenna port and the donor antenna port to reduce antenna-to-antenna feedback for the single band in a second direction between the donor antenna and the server antenna.