RF Circuit Band-Stop Filter Intermodulation Distortion
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Solution Overview
Problem
In 5G mobile communication systems, the simultaneous use of unlicensed bands above 5 GHz with communication bands under 5 GHz leads to intermodulation distortion, degrading the quality of radio frequency signals in the unlicensed band or WLAN band.
Innovation Solution
A radio frequency circuit configuration that includes separate transfer circuits for frequency bands under 5 GHz, 5 GHz and above, with band-stop filters to attenuate interfering signals, preventing intermodulation distortion by isolating and filtering signals across these bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate transfer circuits are used for frequency bands under 5 GHz and 5 GHz or above, then signal quality is improved, but device complexity increases
Solution Approach 1:
The radio frequency circuit is divided into separate transfer circuits for different frequency bands (under 5 GHz and 5 GHz or above), with each circuit having dedicated filters. This segmentation prevents intermodulation distortion by isolating frequency bands while maintaining signal quality through specialized processing paths for each band.
2Reliability
If band-stop filters are added to attenuate interfering signals, then intermodulation distortion is reduced, but device complexity increases
Solution Approach 1:
Band-stop filters are strategically placed in specific transfer circuits to extract and attenuate only the interfering frequency components that cause intermodulation distortion. By removing only the harmful frequency elements rather than filtering entire bands, the filter complexity is minimized while effectively reducing distortion.
3Adaptability or versatility
If multiple transfer circuits operate simultaneously, then communication versatility is improved, but intermodulation distortion increases
Solution Approach 1:
Each transfer circuit is designed with specific filter characteristics tailored to its frequency band and function. The band-stop filters are configured with different attenuation bands depending on which transfer circuit they are placed in, creating local quality differences that prevent intermodulation distortion while allowing simultaneous operation of multiple circuits for versatile communication support.
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 configuration effectively inhibits intermodulation distortion, maintaining signal quality and reception sensitivity across all bands, even when signals from different frequency bands are transmitted simultaneously.
Implementation Method 1
One of the first transfer circuit or the second transfer circuit further includes a band-stop filter having, as an attenuation band, at least a part of a frequency band in which a remaining one of the first transfer circuit or the second transfer circuit transfers a signal
Data Source
AI summary
A radio frequency circuit includes: a first transfer circuit that transfers a signal of a first frequency band under 5 GHz; a second transfer circuit that transfers a signal of a second frequency band higher than or equal to 5 GHz; and a third transfer circuit that transfers a signal of a third frequency band higher than or equal to 5 GHz. One of the second transfer circuit and the third transfer circuit transfers a WLAN signal. The first transfer circuit includes a first filter. The second transfer circuit includes a second filter. The third transfer circuit includes a third filter. One of the first transfer circuit or the second transfer circuit further includes a band-stop filter having, as an attenuation band, at least a part of a frequency band in which the remaining one of the first transfer circuit or the second transfer circuit transfers a signal.