FBAR Filter Front End for Wi-Fi and Bluetooth Coexistence
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Solution Overview
Problem
Concurrent operation of Bluetooth and Wi-Fi signals in the same 2.4 GHz frequency band often results in signal degradation due to RF blocking and out-of-band noise, degrading data throughput and reducing available airtime for Wi-Fi data transmission.
Innovation Solution
Incorporating a plurality of film bulk acoustic resonator (FBAR) filters in the RF front-end circuitry allows for concurrent reception and transmission of Wi-Fi and Bluetooth signals by increasing non-overlapping frequency channels and enabling the filters to switch between them, reducing interference and eliminating the need for time division duplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Bluetooth and Wi-Fi signals operate concurrently in the same 2.4 GHz frequency band, then the number of supported wireless applications increases, but signal degradation occurs due to RF blocking and out-of-band noise
Solution Approach 1:
The patent divides the frequency band into multiple non-overlapping channels using multiple FBAR filters, each tuned to a specific frequency channel. This segmentation allows Bluetooth and Wi-Fi signals to operate concurrently on different channels within the 2.4 GHz band, eliminating RF blocking and out-of-band noise while supporting multiple wireless applications simultaneously
Solution Approach 2:
The transceiver system is designed with a plurality of FBAR filters that can dynamically switch between different frequency channels, enabling the same hardware infrastructure to support multiple wireless applications (Bluetooth, Wi-Fi, and potentially others) across different frequency bands, achieving multi-functionality without requiring separate dedicated hardware for each application
2Reliability
If multiple RF filters are used to increase signal reception quality, then signal reception quality improves, but device complexity increases
Solution Approach 1:
The patent employs a dynamic filter switching mechanism where the transceiver can selectively activate only the FBAR filter corresponding to the currently active frequency channel. Instead of having all filters active simultaneously, the system dynamically switches between filters based on the operating mode (Bluetooth or Wi-Fi), reducing the effective complexity while maintaining the capability to support multiple applications
Solution Approach 2:
The patent combines multiple FBAR filters and their associated switching circuitry into an integrated filter bank structure within the transceiver. This merging of components into a unified architecture reduces the overall device complexity compared to having separate filter assemblies for each wireless application, while still providing the necessary signal reception quality through selective filtering
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 solution enables robust signal coexistence without degrading Wi-Fi data throughput, allowing for up to twice the number of Bluetooth profiles and peripheral devices to be supported, while maintaining efficient data transmission and reception in the same frequency band.
Implementation Method 1
a plurality of film bulk acoustic resonator (FBAR) filters configured to allow the transceiver to transmit the data and to receive the data in the same frequency band by increasing non-overlapping frequency channels
Data Source
AI summary
Devices and systems useful in concurrently receiving and transmitting Wi-Fi signals and Bluetooth signals in the same frequency band are provided. By way of example, an electronic device includes a transceiver configured to transmit data and to receive data over channels of a first wireless network and a second wireless network concurrently. The transceiver includes a plurality of filters configured to allow the transceiver to transmit the data and to receive the data in the same frequency band by reducing interference between signals of the first wireless network and the second wireless network.