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Concentration measurements of dissolved substances in fluids are of great interest for biomedical as well as industrial applications. In this work a multiband vector network analyzer is presented that is capable of determining phase variations due to changes in the concentration. A topology comprising two Six-Port networks optimized for the frequencies 6.6 GHz, 19.7 GHz and 32.4 GHz has been implemented...
For numerous medical applications it is of primary interest to monitor the breath rate and heartbeat of a patient over time. Especially important is to observe the respiration of a patient over night to detect potential sleep disorders. Furthermore, heartbeat frequency is also a precious information which can help to improve diverse diagnosis procedures. In order to better analyze these vital parameters...
This paper presents a novel approach to cardiopul-monary resuscitation (CPR) feedback. The underlying concept is based on an RF transmission through the thorax. With the help of CT images, the link budget is estimated and verified via a full 3D EM simulation of a human body model. Different antennas and operating frequencies between 868MHz and 2.4 GHz are investigated, in terms of their ability to...
A voltage controlled oscillator (VCO) for V-Band applications in miniaturized hybrid integrated circuit (MHMIC) technology is proposed. The introduced circuit is designed to provide its third harmonics in the unlicensed frequency band around 60 GHz. The underlying concept is based on a negative resistance oscillator (NRO), centered at 20 GHz and driven by a PHEMT Transistor. A 3 GHz tuning range is...
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