caa a22 4500 445305401 CHVBK 20180317142611.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10762-011-9837-y doi (NATIONALLICENCE)springer-10.1007/s10762-011-9837-y Design and Development of Thermistor based Power Meter at 140 GHz Frequency Band [Elektronische Daten] [Rajesh Roy, Abhimanyue Kush, Rajendra Dixit] Design and development of thermistor based power meter at 140 gigahertz (GHz) frequency band have been presented. Power meter comprises power sensor, amplifier circuit and dialog based graphical user interface in visual C++ for the average power measurement. The output power level of a component or system is very critical design factor. Thus there was a need of a power meter for the development of millimeter wave components at 140GHz frequency band. Power sensor has been designed and developed using NTC (Negative Temperature Coefficient) thermistors. The design aims at developing a direct, simple and inexpensive power meter that can be used to measure absolute power at 140GHz frequency band. Due to absorption of 140GHz frequencies, resistance of thermistor changes to a new value. This change in resistance of thermistor can be converted to a dc voltage change and amplified voltage change can be fed to computer through data acquisition card. Dialog based graphical user interface (GUI) has been developed in visual C++ language for average power measurement in dBm. WR6 standard rectangular waveguide is the input port for the sensor of power meter. Temperature compensation has been achieved. Moderate sensor return loss greater than 20dB has been found over the frequency range 110 to 170GHz. The response time of the power sensor is 10 second. Average power accuracy is better than ±0.25dB within the power range from −10 to 10 dBm at 140GHz frequency band. Springer Science+Business Media, LLC, 2011 Power meter nationallicence Thermistor nationallicence Millimeter wave nationallicence D band nationallicence Gigahertz nationallicence Roy Rajesh Defence Electronics Applications Laboratory, Raipur Road, 248 001, Dehradun, Uttarakhand, India aut Kush Abhimanyue Defence Electronics Applications Laboratory, Raipur Road, 248 001, Dehradun, Uttarakhand, India aut Dixit Rajendra Defence Electronics Applications Laboratory, Raipur Road, 248 001, Dehradun, Uttarakhand, India aut Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/12(2011-12-01), 1407-1414 1866-6892 32:12<1407 2011 32 10762 https://doi.org/10.1007/s10762-011-9837-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10762-011-9837-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Roy Rajesh Defence Electronics Applications Laboratory, Raipur Road, 248 001, Dehradun, Uttarakhand, India aut NATIONALLICENCE 700 1- Kush Abhimanyue Defence Electronics Applications Laboratory, Raipur Road, 248 001, Dehradun, Uttarakhand, India aut NATIONALLICENCE 700 1- Dixit Rajendra Defence Electronics Applications Laboratory, Raipur Road, 248 001, Dehradun, Uttarakhand, India aut NATIONALLICENCE 773 0- Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/12(2011-12-01), 1407-1414 1866-6892 32:12<1407 2011 32 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer