Split-Band WiFi-7 RF Front End for 5/6 GHz Coexistence

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Solution Overview

Problem

The coexistence problem between 6 GHz and 5 GHz clients communicating with the same Access Point asynchronously, especially with the introduction of 320 MHz channels in the 6 GHz band, is exacerbated by intermodulation distortion and jamming issues, which conventional RF switch architectures struggle to address cost-effectively.

Innovation Solution

A re-designed RF Front End architecture with switched filter banks and very high linearity RF switches, allowing for dynamic configurability and selective filtering across 5 GHz and 6 GHz bands, including 320 MHz channels, using a three-radio approach with specific filter configurations to minimize interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If 6 GHz clients and 5 GHz clients communicate asynchronously with the same Access Point, then the number of available channels and aggregated throughput increase, but intermodulation distortion and jamming issues occur

Engineering Contradiction:

Improveaggregated throughputVSAvoidintermodulation distortion and jamming

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent divides the RF front end into separate 5 GHz and 6 GHz paths with dedicated filters for each band. The 6 GHz bandpass filter isolates the 6 GHz signal path, while the 5 GHz bandpass filter isolates the 5 GHz signal path, preventing intermodulation distortion between bands while maintaining high aggregated throughput across both bands.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a diplexer as an intermediary component that selectively routes 5 GHz and 6 GHz signals to different RF front end paths. The diplexer acts as a frequency-selective mediator that prevents harmful interactions between the two bands while allowing both to operate simultaneously with the same Access Point.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If wide fractional bandwidth steep rejection filters are designed, then intermodulation distortion is reduced, but device complexity and cost increase

Engineering Contradiction:

Improveintermodulation distortionVSAvoidfilter configuration complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent designs filters that can operate across multiple bands and modes. The 6 GHz bandpass filter and 5 GHz bandpass filter are configured to work in various operational modes including 5 GHz only mode, 6 GHz only mode, and concurrent dual-band mode, reducing the need for multiple specialized filters and lowering overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent employs dynamically controllable filters whose characteristics can be adjusted based on operational mode. The filters can be configured to provide steep rejection when needed to reduce intermodulation distortion, or relaxed characteristics when cost and complexity are concerns, allowing optimization of the trade-off between performance and complexity.

Inventive Principle:

Principle #15Dynamics

3Reliability

If high linearity RF switches are used, then signal integrity is improved, but manufacturing cost increases

Engineering Contradiction:

Improvesignal integrityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies high linearity RF switches only in specific locations where signal integrity is most critical, such as at the diplexer output and at key filter interfaces. Other portions of the RF front end use standard switches, optimizing the balance between signal integrity and manufacturing cost by concentrating high-performance components only where necessary.

Inventive Principle:

Principle #3Local quality

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

Enables cost-effective 320 MHz operation with reduced latency and improved throughput by addressing intermodulation distortion and jamming issues, supporting the IEEE 802.11be standard while maintaining performance and cost-effectiveness.

Implementation Method 1

a 6 GHz bandpass filter, the 6 GHz bandpass filter to be connected to the 6 GHz radio

Methodology Applied

Scientific EffectFrequency selective filtering: Filter (electronic)

Implementation Method 2

a 5 GHz bandpass filter, the 5 GHz bandpass filter to be connected to the 5 GHz radio

Methodology Applied

Scientific EffectFrequency selective filtering: Filter (electronic)

Implementation Method 3

a diplexer, the diplexer to have a 5 GHz port, a 6 GHz port, and a common port

Methodology Applied

Scientific EffectFrequency division multiplexing:

Data Source

PatentUS12609718B2WiFi-7 optimized split band architecture and method of operation

Publication Date: 2026.04.21 HEWLETT PACKARD ENTERPRISE DEV LP

AI summary

A system or Access Point having a split band architecture. A first radio communicates with a 6G front end module (FEM) that is connected to a first filter switch bank (FSB) configured to enable a 6G high bandpass filter, a 6G wide bandpass filter, or a 6G narrow bandpass filter. A second radio communicates with a 5G FEM that is connected to a second FSB configured to enable a 6G low bandpass filter, a first 5G low bandpass filter, a 5G wide bandpass filter, or a 5G narrow bandpass filter. A third radio communicates with a 2-5G dual band FEM that is connected to a third FSB configured to enable a 6G full bandpass filter, a 5G high bandpass filter, or a second 5G low bandpass filter. The 2-5G dual FEM may also be connected to a fourth FSB configured to enable a 2G application.