Title :
A microwave VNA for biomedical in-line concentration measurements
Author :
Hofmann, Martin ; Oborovski, Andreas ; Weigel, Robert ; Fischer, Georg ; Kissinger, Dietmar
Author_Institution :
Inst. for Electron. Eng., Univ. of Erlangen-Nuremberg, Erlangen, Germany
Abstract :
This paper presents a microwave (MW) test-set designed for biomedical in-line concentration measurements. The demonstrator consists of a commercial voltage controlled oscillator (VCO) with an output power of up to +12.0 dBm, feeding an asymmetric 4 way power divider. A fraction of 0dBm of the VCO output is driving three I-Q mixers, which realizes a homodyne vector network analyzer. Dual directional couplers were investigated concerning the application for concentration measurements. A wiggly line coupler was separately fabricated and measured as well as implemented in the demonstrator. The entire system is fabricated, calibrated and subsequently characterized with a transmission based permittivity sensor.
Keywords :
biomedical measurement; microwave imaging; microwave mixers; network analysers; permittivity; power dividers; voltage-controlled oscillators; waveguide couplers; I-Q mixers; VCO output; asymmetric 4 way power divider; biomedical in-line concentration measurement; demonstrator; dual directional couplers; homodyne vector network analyzer; microwave VNA; microwave test-set; output power; transmission based permittivity sensor; voltage controlled oscillator; wiggly line coupler; Biomedical measurement; Couplers; Microwave measurement; Microwave theory and techniques; Permittivity; Permittivity measurement; Transmission line measurements;
Conference_Titel :
Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS), 2013 IEEE Topical Conference on
Conference_Location :
Austin, TX
Print_ISBN :
978-1-4673-2930-9
DOI :
10.1109/BioWireleSS.2013.6613670
