Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 19, Issue 1, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2012.2215017
Keywords
Impedance-matching technique; resonant tunneling diodes (RTDs); slot antennas; terahertz wave oscillators
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Industry-Academia Collaborative R&D from Japan Science and Technology Agency
- Strategic Information and Communications R&D Promotion Programme from the Ministry of Public Management, Home Affairs, Posts and Telecommunications
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We report the theoretical and experimental results of an examination of the structure needed to achieve high output power in resonant tunneling diode (RTD) oscillators in the terahertz range. An offset-fed slot antenna and antenna width adjustments were employed in a single oscillator to increase the output power by increasing the radiation conductance and impedance matching. A high output power oscillation (similar to 400 mu W) at 530-590 GHz was obtained by RTDs with a large negative deferential conductance (NDC) region and offset-fed slot antennas. The maximization of the output power that was obtained by adjusting the antenna width was attributed to the impedance matching between the RTD and antenna. An output power of >1 mW is theoretically expected in an oscillator that combines an RTD with a large NDC region, offset-fed slot antenna, and antenna width adjustment. In an array configuration, oscillators with an offset structure were employed for array elements and connected together with the metal-insulator-metal stub structure. A single peak was observed in the oscillation spectrum, and combined output powers of 610, 270, and 180 mu W at 620, 770, and 810 GHz were obtained in a two-element array.
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