RF Duplexer Phase Cancellation Isolation
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Solution Overview
Problem
RF duplexing devices face challenges in providing adequate isolation between transmission and receive channels without introducing significant insertion losses, which affects power efficiency and compliance with spectral requirements.
Innovation Solution
The use of a first duplexer configured to provide a phase shift and a second duplexer configured to provide a differential phase shift, allowing for isolation through cancellation rather than relying solely on impedance increases, thereby minimizing insertion losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If additional isolation is provided by increasing impedances and/or providing higher attenuation between transmission and receive channels, then isolation between transmission and receive channels is improved, but insertion losses increase and power efficiency performance deteriorates
Solution Approach 1:
The patent converts the harmful transmission signal that leaks into the receive channel into a beneficial cancellation signal. By capturing the transmitted signal through the first duplexer and creating an inverted copy through the second duplexer, the system transforms the interference problem into a solution where the inverted signal actively cancels the leaked transmission signal at the receive port, achieving high isolation without additional attenuation or impedance increases that would cause insertion losses
Solution Approach 2:
The system applies preliminary anti-action by pre-processing the transmitted signal through the first duplexer and second duplexer to create an inverted version before the transmission signal can interfere with the receive channel. This proactive cancellation approach prevents the harmful interaction between transmit and receive signals rather than relying on passive attenuation methods that would increase insertion losses
2Object-affected harmful factors
If isolation through cancellation is achieved using differential phase shifts, then isolation between transmission and receive channels is improved without significant insertion losses, but device complexity increases due to additional duplexer components
Solution Approach 1:
The patent applies multi-functionality by designing the first and second duplexers to serve multiple purposes: the first duplexer both transmits the main transmission signal to the antenna and captures a portion of it for cancellation purposes, while the second duplexer both receives signals and processes the cancellation signal. This multi-functional approach achieves the isolation function without requiring completely separate additional components, thereby reducing the overall complexity increase compared to using entirely separate isolation circuits
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
This approach enables high levels of transmission-receive isolation without increasing insertion losses, improving power efficiency while meeting spectral requirements for RF communication standards.
Implementation Method 1
The first duplexer is configured to provide a first phase shift from the transmission port to the receive port
Implementation Method 2
the second duplexer is configured to provide a second phase shift that is differential to the first phase shift from the transmission port to the receive port
Implementation Method 3
By providing the second phase shift so that the second phase shift is differential to the first phase shift, the RF duplexing device can provide isolation through cancellation
Data Source
AI summary
Radio frequency (RF) duplexing devices and methods of operating the same are disclosed. In one embodiment, an RF duplexing device includes a transmission port, a receive port, a first duplexer, and a second duplexer. The first duplexer is coupled to the transmission port and the receive port, and is configured to provide a first phase shift from the transmission port to the receive port. The second duplexer is also coupled to the transmission port and the receive port. However, the second duplexer is configured to provide a second phase shift that is differential to the first phase shift from the transmission port to the receive port. By providing the second phase shift so that the second phase shift is differential to the first phase shift, the RF duplexing device can provide isolation through cancellation without needing to introduce significant insertion losses.