Low Cost, High Performance, 16-Channel Microwave Measurement System for Tomographic Applications

Autor:	Sebastian Richter, Shireen D. Geimer, Keith D. Paulsen, Florian Schoenberger, Paul M. Meaney, Alexander Hartov, Timothy Raynolds, Cynthia Davis
Rok vydání:	2020
Předmět:	Computer science leakage 0206 medical engineering 02 engineering and technology lcsh:Chemical technology Biochemistry Article Analytical Chemistry law.invention law Shielded cable 0202 electrical engineering electronic engineering information engineering Electronic engineering lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation breast dynamic range software defined radio System of measurement 020206 networking & telecommunications Software-defined radio 020601 biomedical engineering Atomic and Molecular Physics and Optics Microwave imaging microwave imaging multipath Transceiver Multipath propagation Microwave Communication channel
Zdroj:	Sensors Volume 20 Issue 18 Sensors, Vol 20, Iss 5436, p 5436 (2020) Sensors (Basel, Switzerland)
ISSN:	1424-8220
DOI:	10.3390/s20185436
Popis:	We have developed a multichannel software defined radio-based transceiver measurement system for use in general microwave tomographic applications. The unit is compact enough to fit conveniently underneath the current illumination tank of the Dartmouth microwave breast imaging system. The system includes 16 channels that can both transmit and receive and it operates from 500 MHz to 2.5 GHz while measuring signals down to &minus 140 dBm. As is the case with multichannel systems, cross-channel leakage is an important specification and must be lower than the noise floors for each receiver. This design exploits the isolation inherent when the individual receivers for each channel are physically separate however, these challenging specifications require more involved signal isolation techniques at both the system design level and the individual, shielded component level. We describe the isolation design techniques for the critical system elements and demonstrate specification compliance at both the component and system level.
Databáze:	OpenAIRE
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