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Accession number;99A0938097
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| Title;A Study on Coherent Power Combining of Resonant Tunneling Diodes for a Submillimeter Wave Source. |
| Author;
FUJII TETSU
(Tohoku Univ.)
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Journal Title;Record of Electrical and Communication Engineering Conversazione, Tohoku University
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Journal Code:F0511A
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ISSN:0385-7719
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VOL.68;NO.1;PAGE.122-125(1999)
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| Figure&Table&Reference;FIG.6, REF.7 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;A resonant tunneling diode(RTD) is a promising device for generating signals in the millimeter and submillimeter wave regions. However, a RTD has a two problems: (i) its output power is very small in these regions. (ii) its inherently broadband negative differential resistance(NDR) usually leads to undesirable low frequency spurious oscillations. To get more power, one of solutions is coherent power combining of multi-RTD's using a quasi-optical resonator. A Fabry-Perot resonator with a grating has been used for coherent power combining of a RTD array in the millimeter wave region. Coherent power combining with two RTD's in the resonator has been successfully observed for the fundamental TEM00 resonator mode at the frequency of 75GHz. To eliminate unwanted low requency spurious oscillations, we propose using a series connection of two RTD's and present some preliminary results. Due to DC instability of the series connection, it is difficult to bias all RTD's in the NDR region. We have experimentally demonstrated RF switching of the bias points to the NDR region. Therefore this circuit has been demonstrated as an amplifier or a frequency multiplier when the bias point is in the NDR region. (author abst.) |
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