A tunable Cavity Backed Slot Antenna (CBSA) for close proximity biomedical sensing applications

Bonds, Quenton; Weller, Thomas M.; Roeder, B; Herzig, P.

doi:10.1109/comcas.2009.5385960

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…7. As described in [16], the antenna is designed to meet the requirements for close proximity functionality of radiometric sensors in the presence of biological media. For instance, it is tunable to 50 MHz/mm of the feed length, broadband ( ) and very efficient (88%).…”

Section: B Cbsa For Close-proximity Biomedical Sensingmentioning

confidence: 99%

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Towards Core Body Temperature Measurement via Close Proximity Radiometric Sensing

et al. 2012

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Presented is a noncontact model and radiometric sensor developed to facilitate core body temperature extraction. The system has been designed as a close-proximity sensor to detect thermal emissions radiated from deep inside the human body. The radiometer uses a cavity-backed slot antenna (CBSA) designed to account for performance degradation which occurs in the near field of the human body. Tissue-simulating materials with electrical properties similar to the human body have been identified, and layered configurations of these phantoms are used to mimic the electromagnetic characteristics of a human stomach volume: hence, defines the core model. Positioned approximately 7 mm from the core model, the sensor tracks the change in brightness temperature as the subsurface physical temperature is varied. A mathematical noncontact model (NCM) is subsequently used to correlate the observed brightness temperature to the subsurface temperature, accounting for artifacts induced by the sensor's remote positioning from the specimen. The accuracy of the NCM is validated through an analysis of the measurement data extracted from the test bed before and after applying the model. The results illustrate that the measurement is highly sensitive to the antenna impedance match and atmospheric temperature. The measurement is less sensitive to the physical temperature of the instrument and emissivity of the specimen. The results of this study demonstrate that radiometric sensors are capable of close proximity, subsurface extraction of biological data given that certain parameters are closely monitored. Index Terms-Closeproximity health monitoring, near-field biomedical sensing, noncontact biomedical sensing, noninvasive biomedical monitoring. 1530-437X/$26.00 John Gerig, photograph and biography not available at the time of publication. Thomas M. Weller (S'92-M'95-SM'98) received the B.S., M.S., and Ph.D. degrees in electrical engineering in 1988, 1991, and 1995, respectively, from the University of Michigan, Ann Arbor.

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Section: B Cbsa For Close-proximity Biomedical Sensingmentioning

confidence: 99%

“…Broad bandwidth enables high-resolution sensing and highly efficient antennas ensure the maximum detectable signal is delivered to the system, resulting in reduced measurement uncertainty. Details of the CBSA design are given in [16].…”

Section: B Cbsa For Close-proximity Biomedical Sensingmentioning

confidence: 99%

Towards Core Body Temperature Measurement via Close Proximity Radiometric Sensing

et al. 2012

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“…At present, the microwave radiation temperature measurement system based on the total power radiometer and Dicke radiometer has achieved a series of achievements [8][9][10]. However, the total power radiometer and Dicke radiometer has large temperature measurement error and low temperature measurement accuracy.…”

Section: Introductionmentioning

confidence: 99%

Design of a Compact Analog Complex Correlator for Millimeter-Wave Radiation Temperature Measurement System

Dong

et al. 2023

Micromachines

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Human body temperature is a fundamental physiological sign that reflects the state of physical health. It is important to achieve high-accuracy detection for non-contact human body temperature measurement. In this article, a Ka band (32 to 36 GHz) analog complex correlator using the integrated six-port chip is proposed, and a millimeter-wave thermometer system based on the designed correlator is completed for human body temperature measurement. The designed correlator utilizes the six-port technique to achieve large bandwidth and high sensitivity, and miniaturization of the correlator is achieved through an integrated six-port chip. By performing the single-frequency test and the broadband noise measurement on the correlator, we can determine that the dynamic range of input power of the correlator is −70 dBm to −35 dBm, and the correlation efficiency and equivalent bandwidth are 92.5% and 3.42 GHz, respectively. Moreover, the output of the correlator varies linearly with the input noise power, which reveals that the designed correlator is suitable for the field of human body temperature measurement. Then, a handheld thermometer system, with a size of 140 mm × 47 mm × 20 mm, is proposed using the designed correlator, and the measurement results show that the temperature sensitivity of the thermometer is less than 0.2 K.

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“…The measurement result showed that the Dicke microwave radiometer with printed dipole antenna can track the trend of physical temperature change of tissue model, but the measurement error was very large. In 2009–2012, Bondst et al [ 2 , 3 , 4 ] improved the measurement antenna and designed an antenna probe with good directivity, which can radiate energy in uniaxial direction. In addition, they improved the system structure of the radiometer.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Novel Interferometric Microwave Radiometer for Human Body Temperature Measurement

Sun

Liu

et al. 2021

Sensors

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In this paper, the key technology of interferometric microwave thermometer is studied, the research can be applied to the temperature measurement of human body and subcutaneous tissue. This paper proposes a hardware architecture of interferometric microwave thermometer with 2 GHz bandwidth, in which the phase shifter is used to correct phase error and the quadrature demodulator is used to realize autocorrelation detection function. The results show that when input power is 7 dBm, the detection sensitivity can reach 176.54 mV/dBm and the temperature resolution of the microwave radiometer can reach 0.4 K. Correction algorithm is designed to improve the accuracy of temperature measurement. After correction, the phase error is reduced from 40° to 1.4° and when temperature changes 0.1 °C, the voltage value changes obviously. Step-by-step calibration and overall calibration are used to calibrate the device. Inversion algorithm can determine the relationship between physical temperature and output voltage. The mean square error of water temperature inversion by multiple linear regression algorithm is 0.607 and that of BP neural network algorithm is 0.334. The inversion accuracy can be improved by reducing the temperature range. Our work provides a promising realization of accurate, rapid and non-contact detection device of human body temperature.

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A tunable Cavity Backed Slot Antenna (CBSA) for close proximity biomedical sensing applications

Cited by 5 publications

References 5 publications

Towards Core Body Temperature Measurement via Close Proximity Radiometric Sensing

Towards Core Body Temperature Measurement via Close Proximity Radiometric Sensing

Design of a Compact Analog Complex Correlator for Millimeter-Wave Radiation Temperature Measurement System

Design and Implementation of a Novel Interferometric Microwave Radiometer for Human Body Temperature Measurement

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