RF Microwave Core Temperature System Using CMOS Receiver Module
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Solution Overview
Problem
Conventional core body temperature measurement methods, such as infrared thermometers, are limited in accurately measuring core body temperature as they measure skin temperature, which varies with ambient conditions and individual differences, and existing RF microwave technologies face challenges in achieving precise temperature measurement due to inefficiencies in RF frequency usage and power reception.
Innovation Solution
An RF microwave core body thermometer system with an RF receiver module manufactured using a CMOS process on a silicon substrate, employing an RF/IF receiver module that utilizes RF frequency signals between 1 to 10 GHz, excluding certain frequencies, to measure core body temperature through a contact-type patch antenna and interface circuit unit, converting heat radiation signals into core body temperature values using Planck's law.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared thermometers are used to measure body temperature, then the measurement process is simple and fast, but the measurement accuracy is low because they only measure skin temperature which varies with ambient conditions
Solution Approach 1:
The patent replaces conventional infrared thermal radiation measurement with RF microwave radiometry. Instead of measuring infrared radiation from the skin surface, the system uses RF receiver circuits to detect microwave signals penetrating into the body, substituting a different physical measurement approach to achieve core temperature measurement while maintaining device practicality
Solution Approach 2:
The patent changes the measurement parameter from infrared radiation intensity to RF frequency signal characteristics. By measuring RF signals at multiple frequencies (e.g., 2.45 GHz and 5.8 GHz) and analyzing their attenuation and phase differences, the system can distinguish between skin temperature and core body temperature, improving measurement accuracy through parameter transformation
2Measurement precision
If RF microwave technologies are used to measure core body temperature, then the measurement depth increases to reach core temperature, but the power reception efficiency and measurement precision are insufficient
Solution Approach 1:
The patent employs periodic modulation of RF signals at different frequencies to enhance power reception efficiency. By using frequency-modulated continuous wave (FMCW) or pulsed RF signals, the system can distinguish between reflected and transmitted signals, improving the detection of weak microwave signals from deep tissue while maintaining efficient power utilization
Solution Approach 2:
The patent designs a multi-functional RF receiver module that can operate at multiple frequency bands (e.g., 2.45 GHz and 5.8 GHz) using the same hardware platform. This universal design allows the system to select optimal frequencies based on tissue penetration requirements and interference conditions, improving both power efficiency and measurement precision across different measurement scenarios
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 system effectively measures core body temperature by penetrating up to 5 cm beneath the skin, providing accurate readings across various body parts, overcoming the limitations of skin surface temperature measurements and enhancing the precision and range of existing RF microwave technologies.
Implementation Method 1
an RF contact-type patch antenna to receive a heat radiation signal radiated from an inside under a skin of a human body
Implementation Method 2
an RF receiver circuit unit to receive any one RF frequency signal within a frequency range of 1 to 10 GHz
Implementation Method 3
converting heat radiation signals into core body temperature values using Planck's law
Data Source
AI summary
Provided are a radio frequency (RF) receiver module for sensing core body temperature and an RF microwave core body thermometer system having the same. The RF receiver module for sensing core body temperature and the RF microwave core body thermometer having the same include: an RF contact-type patch antenna attached to a body part to sense the core body temperature; an RF receiver circuit unit attached to the body part to receive any one RF frequency signal within an RF frequency range of 1 to 10 GHz except for 1.4 GHz, 1.6 GHz, 1.7 GHz, 2.6 GHz and 2.7 GHz through the RF contact-type patch antenna for sensing core body temperature; and an interface circuit unit for connecting the RF receiver circuit unit to a control unit of a microprocessor control unit.