RF Front End Module External Filter Integration
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Solution Overview
Problem
Radio frequency devices operating in ISM bands face electromagnetic interference issues due to multiple devices using the same or nearby frequency bands, leading to disrupted communications.
Innovation Solution
A wireless access point device with a radio frequency front end module (FEM) that includes an integrated circuit and external filters, enabling high band selectivity and high power handling, allowing flexible operation across various frequency bands and reducing interference through band pass filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices operate in ISM bands, then communication coverage and device availability increase, but electromagnetic interference and signal disruption increase
Solution Approach 1:
The patent segments the radio frequency spectrum into distinct bands using multiple band pass filters, each targeting a specific frequency range (e.g., 700 MHz, 1.9 GHz, 2.4 GHz, 5 GHz). This segmentation allows the system to selectively process signals from different bands while rejecting interference from other bands, thereby maintaining high device availability while mitigating electromagnetic interference through frequency-domain separation.
Solution Approach 2:
The patent introduces an intermediary filtering stage between the antenna and the receiver components. Multiple band pass filters act as intermediaries that selectively pass desired frequency bands while blocking unwanted frequencies. This intermediary filtering mechanism enables coexistence of multiple devices in ISM bands by mediating the interference through selective frequency acceptance and rejection.
2Measurement precision
If external filters are used to achieve high band selectivity, then signal band width control improves, but device complexity increases
Solution Approach 1:
The patent implements a universal filter configuration where multiple band pass filters are integrated into a single module that can handle multiple frequency bands simultaneously. The same physical infrastructure (antenna, filters, amplifiers, switches) serves multiple functions by processing different frequency bands through selective activation. This multi-functionality approach achieves high band selectivity without proportionally increasing device complexity, as the system reuse the same components across different bands.
Solution Approach 2:
The patent employs dynamic switching mechanisms that allow the system to adaptively activate only the necessary filters and signal paths based on the current operating band requirements. Control logic dynamically configures the filter network, enabling the system to transition between different frequency bands (700 MHz, 1.9 GHz, 2.4 GHz, 5 GHz) without requiring permanent physical reconfiguration. This dynamic approach maintains high band selectivity while minimizing the effective complexity at any given moment.
3Area of moving object
If integrated circuit is used instead of discrete components, then footprint size decreases, but power handling capability may be limited
Solution Approach 1:
The patent merges multiple discrete components (filters, amplifiers, switches, and control logic) into a single integrated circuit module. This consolidation achieves compact footprint while maintaining high power handling capability through careful design of the integrated components. The integrated module can handle radio frequency power at multiple bands (700 MHz, 1.9 GHz, 2.4 GHz, 5 GHz) by combining the functions of multiple discrete components into unified integrated structures that preserve power handling while reducing size.
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 enables efficient coexistence of devices operating in different frequency bands, such as WiFi, LTE, and ZigBee, by adapting to different signal requirements without modifying the integrated circuit layout, reducing design time and ensuring regulatory compliance.
Implementation Method 1
An external filter, such as a band pass filter, can be connected to the integrated circuit to provide a high selectivity in terms of signal band width
Data Source
AI summary
A radio frequency front end module is provided for a high power capability and a high signal band selectivity. The front end module includes an external filter and an integrated circuit coupled with the external filter via two external filter leads. The integrated circuit includes a transmit-receive switch, a power amplifier and a low noise amplifier. The transmit-receive switch alternates between coupling an antenna port to a transmit port and coupling the antenna port to a receive port. The power amplifier amplifies a modulated radio frequency signal. The low noise amplifier amplifies a received radio frequency signal when the antenna port is coupled to the receive port. The external filter can be replaced to adapt to various requirements of signal frequency bands, without the need of modifying the layout of the integrated circuit.