Shared Radiohead Antenna Circuitry for Multi-RAT Interference Isolation
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Solution Overview
Problem
As wireless communication devices integrate multiple radio technologies, ensuring regulatory compliance becomes challenging due to mechanical constraints and reduced radio transmission power, particularly in smaller form factors, where sharing antennas between different radio access technologies (RATs) like WWAN and Wi-Fi/Bluetooth is beneficial but poses technical inefficiencies such as cross-interference and increased costs.
Innovation Solution
A distributed radio system where the radiohead RF circuitry and antenna circuitry are co-located within a common module or package, eliminating the need for specialized RF cables and reducing packaging parasitics, allowing for efficient integration and sharing of antennas between WWAN and Wi-Fi/Bluetooth modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antennas are shared between different RATs (WWAN and Wi-Fi/Bluetooth), then the number of antennas is reduced and device size is minimized, but cross-interference between radio technologies increases and regulatory compliance becomes more difficult
Solution Approach 1:
The patent segments the radio system into separate radio modules (WWAN module and Wi-Fi/Bluetooth module), each with its own radiohead and antenna circuitry. This segmentation allows independent optimization of each radio path while sharing the antenna, reducing cross-interference through isolated RF signal paths and dedicated impedance matching networks for each RAT.
Solution Approach 2:
The patent introduces intermediary components including separate RF cables, diplexers, and impedance matching networks that act as mediators between the shared antenna and different radio modules. These intermediaries enable frequency-based signal separation and impedance optimization, allowing multiple RATs to share the antenna without significant cross-interference.
2Reliability
If separate RF cables are used to connect radio modules to antennas, then signal transmission is enabled, but manufacturing costs increase and packaging complexity increases
Solution Approach 1:
The patent implements a universal antenna interface that can serve multiple radio modules through a standardized connector and impedance matching network. The shared antenna system with a single cable replacement for multiple dedicated cables reduces manufacturing complexity and cost while maintaining reliable signal transmission through proper RF design and isolation.
3Volume of moving object
If radio transmission power is restricted to meet mechanical constraints in smaller form factors, then device size is reduced, but communication performance deteriorates
Solution Approach 1:
The patent employs parameter optimization including impedance matching networks tuned for each RAT, selective RF cable routing, and frequency-dependent diplexer design. These parameter changes maximize power transfer efficiency and transmission power within the constrained form factor, improving communication performance without increasing device size.
Data Source
Figure 1A
Figure 1B
Figure 2~3
AI summary
A combined antenna circuitry including a multi-feed antenna including a first antenna feed, a second antenna feed, and a third antenna feed; wherein the first antenna feed is configured to be connected to a first antenna of the combined antenna circuitry and is configured to operate on a first frequency band of a first radio access technology (RAT); wherein the second antenna feed is configured to be connected to a second antenna of the combined antenna circuitry and is configured to operate on a second frequency band of the first RAT; and wherein the third antenna feed is configured to be connected to the second antenna of the combined antenna circuitry and is configured to operate on a frequency band of a second RAT, wherein the frequency band of the second RAT does not correspond to any frequencies of the second frequency band of the first RAT.