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Proceedings Paper • Open Access

Micro and nano devices in passive millimetre wave imaging systems
Author(s): R. Appleby

Paper Abstract

The impact of micro and nano technology on millimetre wave imaging from the post war years to the present day is reviewed. In the 1950s whisker contacted diodes in mixers and vacuum tubes were used to realise both radiometers and radars but required considerable skill to realise the performance needed. Development of planar semiconductor devices such as Gunn and Schottky diodes revolutionised mixer performance and provided considerable improvement. The next major breakthrough was high frequency transistors based on gallium arsenide which were initially used at intermediate frequencies but later after further development at millimeter wave frequencies. More recently Monolithic Microwave Integrated circuits(MMICs) offer exceptional performance and the opportunity for innovative design in passive imaging systems. In the future the use of micro and nano technology will continue to drive system performance and we can expect to see integration of antennae, millimetre wave and sub millimetre wave circuits and signal processing.

Paper Details

Date Published: 4 June 2013
PDF: 9 pages
Proc. SPIE 8725, Micro- and Nanotechnology Sensors, Systems, and Applications V, 872524 (4 June 2013); doi: 10.1117/12.2015674
Show Author Affiliations
R. Appleby, Queen's Univ. Belfast (Ireland)

Published in SPIE Proceedings Vol. 8725:
Micro- and Nanotechnology Sensors, Systems, and Applications V
Thomas George; M. Saif Islam; Achyut K. Dutta, Editor(s)

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