Universiti Teknologi Malaysia Institutional Repository

Integration of interdigital-gated plasma wave device for proximity communication system application

Hashim, Abdul Manaf and Kasai, Seiya and Hashizume, Tamotsu and Hasegawa, Hideki (2007) Integration of interdigital-gated plasma wave device for proximity communication system application. Microelectronics Journal, 38 (12). pp. 1263-1267. ISSN 0026-2692

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Official URL: http://dx.doi.org/10.1016/j.mejo.2007.09.028


Interdigital-gated AlGaAs/GaAs high-electron-mobility transistor (HEMT) structure was used to investigate the interaction between the drifting carrier plasma waves and electromagnetic (EM) waves. It was shown theoretically that the interaction in the range from microwave to terahertz (THz) at room temperature should produce negative conductance characteristics when the carrier drift velocity slightly exceeds the phase velocity of EM waves. S-parameter reflection measurements were carried out at room temperature for a frequency range from 1 to 20 GHz and a drastic change in conductance was observed at 5 and 10 GHz with the increase of drain-source voltage. Large conductance change over 1000 mS/mm was obtained and it showed a peak at a certain frequency. The peak position could be controlled by changing the pitch size of the interdigital gates. These characteristics can be used for high-frequency applications such as high-speed switching devices although a feature size of our interdigital-gated HEMT device is much larger than conventional HEMT device.

Item Type:Article
Uncontrolled Keywords:GaAs, HEMT, interdigital, negative conductance, plasma wave, terahertz
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:7625
Deposited By: Maznira Sylvia Azra Mansor
Deposited On:12 Jan 2009 07:21
Last Modified:12 Jan 2009 07:21

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