A Compact, Versatile Six-Port Radar Module for Industrial and Medical Applications

Linz, Sarah; Vinci, Gabor; Mann, Sebastian; Lindner, Stefan; Barbon, Francesco; Weigel, Robert; Koelpin, Alexander

doi:10.1155/2013/382913

Cited by 12 publications

(2 citation statements)

References 12 publications

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“…A so-called six-port-based CW radar sensor is even capable of measuring movement within the micrometer range [ 38 ]. The six ports include two input and four output ports and have the characteristic that two input signals are superimposed under four relative and static phase shifts which results in four sum signals as output [ 39 ].…”

Section: Introductionmentioning

confidence: 99%

Automated Non-Contact Respiratory Rate Monitoring of Neonates Based on Synchronous Evaluation of a 3D Time-of-Flight Camera and a Microwave Interferometric Radar Sensor

Gleichauf

Herrmann

Hennemann

et al. 2021

Sensors

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This paper introduces an automatic non-contact monitoring method based on the synchronous evaluation of a 3D time-of-flight (ToF) camera and a microwave interferometric radar sensor for measuring the respiratory rate of neonates. The current monitoring on the Neonatal Intensive Care Unit (NICU) has several issues which can cause pressure marks, skin irritations and eczema. To minimize these risks, a non-contact system made up of a 3D time-of-flight camera and a microwave interferometric radar sensor is presented. The 3D time-of-flight camera delivers 3D point clouds which can be used to calculate the change in distance of the moving chest and from it the respiratory rate. The disadvantage of the ToF camera is that the heartbeat cannot be determined. The microwave interferometric radar sensor determines the change in displacement caused by the respiration and is even capable of measuring the small superimposed movements due to the heartbeat. The radar sensor is very sensitive towards movement artifacts due to, e.g., the baby moving its arms. To allow a robust vital parameter detection the data of both sensors was evaluated synchronously. In this publication, we focus on the first step: determining the respiratory rate. After all processing steps, the respiratory rate determined by the radar sensor was compared to the value received from the 3D time-of-flight camera. The method was validated against our gold standard: a self-developed neonatal simulation system which can simulate different breathing patterns. In this paper, we show that we are the first to determine the respiratory rate by evaluating the data of an interferometric microwave radar sensor and a ToF camera synchronously. Our system delivers very precise breaths per minute (BPM) values within the norm range of 20–60 BPM with a maximum difference of 3 BPM (for the ToF camera itself at 30 BPM in normal mode). Especially in lower respiratory rate regions, i.e., 5 and 10 BPM, the synchronous evaluation is required to compensate the drawbacks of the ToF camera. In the norm range, the ToF camera performs slightly better than the radar sensor.

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Section: Introductionmentioning

confidence: 99%

Automated Non-Contact Respiratory Rate Monitoring of Neonates Based on Synchronous Evaluation of a 3D Time-of-Flight Camera and a Microwave Interferometric Radar Sensor

Gleichauf

Herrmann

Hennemann

et al. 2021

Sensors

Self Cite

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show abstract

“…However, such systems present some limitations, such as the limited range, the difficulty to operate in the presence of smooth surfaces with a low incidence angle. Recent studies showed the possibility of using electromagnetic radiation for the detection of obstacles placed in front of visually impaired people [5,6].…”

Section: Introductionmentioning

confidence: 99%

Serial Patch Array Antenna for an FMCW Radar Housed in a White Cane

Pisa

Pittella

Piuzzi

2016

International Journal of Antennas and Propagation

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The design, realization, and test of the transmitting and receiving antennas for an FMCW radar operating between 24 and 24.25 GHz (ISM band), to be housed in a white cane for improving mobility of visually impaired subjects, have been performed. The coaxial-to-microstrip transition necessary for feeding the antennas has been studied together with the characteristics of serial arrays of increasing number of patches. Based on this study, a serial array with 8 patches has been selected for the transmitting and receiving antennas. The realized structures show a reflection coefficient lower than −10 dB in the ISM band. When the antennas are attached to an FMCW radar board, the radar is able to record reflections from a metallic panel up to a 5 m distance.

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Evaluation of the impact of antenna parameters on the performance of Six-port radar

Linz

Vinci²,

Lindner

et al. 2014

2014 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)

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A Compact, Versatile Six-Port Radar Module for Industrial and Medical Applications

Cited by 12 publications

References 12 publications

Automated Non-Contact Respiratory Rate Monitoring of Neonates Based on Synchronous Evaluation of a 3D Time-of-Flight Camera and a Microwave Interferometric Radar Sensor

Automated Non-Contact Respiratory Rate Monitoring of Neonates Based on Synchronous Evaluation of a 3D Time-of-Flight Camera and a Microwave Interferometric Radar Sensor

Serial Patch Array Antenna for an FMCW Radar Housed in a White Cane

Evaluation of the impact of antenna parameters on the performance of Six-port radar

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