WLAN Bluetooth Antenna Coexistence via Notched Filter Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The coexistence of WLAN and BLUETOOTH wireless communication services sharing a single antenna leads to interference issues due to their overlapping frequency spectrum, resulting in performance degradation, particularly affecting WLAN throughput.
Innovation Solution
A system comprising an antenna, switching devices, and a controller that manages signal transmission and reception paths to attenuate BLUETOOTH signals and prioritize operations based on frequency bands, priorities, and operation types, ensuring simultaneous operation without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If WLAN and BLUETOOTH modules share a single antenna, then cost and space are reduced, but interference occurs due to overlapping frequency spectrum
Solution Approach 1:
The patent segments the frequency spectrum by introducing a notched filter that selectively blocks BLUETOOTH frequency bands from the WLAN receiver path. This divides the shared antenna's output into frequency-separated channels, allowing WLAN to operate without interference from BLUETOOTH signals in overlapping bands while maintaining single-antenna architecture
Solution Approach 2:
The notched filter acts as an intermediary component between the shared antenna and the WLAN receiver. It mediates the frequency conflict by attenuating BLUETOOTH signals before they reach the WLAN receiver, enabling both modules to coexist on the same antenna without mutual interference
2Reliability
If time-division multiplexing is used to avoid interference, then signal quality improves, but data throughput decreases due to operation conflicts
Solution Approach 1:
The patent changes the frequency domain parameter by introducing frequency selective filtering instead of time-domain separation. The notched filter creates frequency notches at BLUETOOTH channels, allowing WLAN to continuously operate across available frequencies while excluding BLUETOOTH bands, thereby maintaining high throughput without time-division constraints
3Adaptability or versatility
If frequency spectrum is shared between WLAN and BLUETOOTH, then spectrum utilization improves, but performance degradation occurs due to simultaneous operation conflicts
Solution Approach 1:
The frequency spectrum is segmented into WLAN bands and BLUETOOTH bands using notched filters. This segmentation allows both systems to utilize the shared 2.4 GHz spectrum simultaneously without interference, as the filter divides the spectrum into non-overlapping operational regions for each technology
Solution Approach 2:
The notched filter enables continuous WLAN operation without time-division interruptions. WLAN data transmission and reception can proceed continuously across frequencies not blocked by the notches, maintaining high throughput while BLUETOOTH operates in its designated frequency slots
Data Source
AI summary
A system for the coexistence between a plurality of wireless communication modules sharing a single antenna is provided, including an antenna, first and second transceiving paths, and first and second wireless communications modules. The first transceiving path is coupled to the antenna. The second transceiving path is coupled to the first transceiving path. The first wireless communications module is coupled to the first transceiving path and transmits or receives a plurality of first wireless signals. The second wireless communications module is coupled to the second transceiving path and transmits or receives a plurality of second wireless signals, wherein signal strengths of the second wireless signals passing through the second transceiving path are attenuated by a certain level, and the attenuated second wireless signals are added to the first wireless signals when passing through the first transceiving path.