| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
Terahertz oscillators with Resonant tunneling diodes (RTDs) and slot antennas were investigated for high frequency and high output power. To obtain high-frequency oscillation, we optimized the thickness of the collector spacer layer, for which a trade-off relation exists in terms of the reduction of the electron transit time and capacitance. A narrow quantum well for short dwell time and an antenna structure for low conduction loss were also employed. By these procedures, room-temperature fundamental oscillation of up to 1.92 THz was achieved. To date, this is the highest oscillation frequency in a single solid-state electronic oscillator. For high-output power operation of the RTD oscillators, we employed offset-fed slot antenna for impedance matching between RTD and antenna, and also utilized power combination technique with array configuration. To date, 610 μW has been obtained in a preliminary experiment performed at 620 GHz using a two-element array of the offset slot antennas.
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