Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 12, Issue 5, Pages 481-488Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2022.3170516
Keywords
Oscillators; Phase measurement; Lenses; Injection-locked oscillators; Slot antennas; Silicon; Resonant frequency; Injection-locked oscillators; phase measurement; resonant tunneling diodes (RTDs); terahertz (THz) radiation
Funding
- JSPS [21H04552]
- JST-CREST [JPMJCR21C4]
- JST-ASTEP [JPMJTM20CU]
- SCOPE from the Ministry of Internal Affairs and Communications [JP215003005]
- Canon Foundation
- NICT [03001]
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This study successfully demonstrated the phase control of an injection-locked RTD oscillator, with the use of a developed device package and a heterodyne detection system, achieving accurate phase control in the injection-locking state.
Controlling the phase of terahertz (THz) waves is necessary for various applications, particularly beam steering with phased arrays. Resonant tunneling diodes (RTDs) are promising candidates for compact THz sources, and injection-locking phenomenon can be used to control the phase of RTD oscillators. In this study, we experimentally demonstrate the phase control of an injection-locked RTD oscillator. We fabricated an RTD oscillator with a slot antenna and developed a device package that reduces external THz feedback to obtain continuous frequency tuning. The free-running frequency varied from 380.5 to 386.7 GHz over a bias range of 0.61 to 0.65 V. To measure the phase of RTD oscillator, we constructed a heterodyne detection system in which all signals were well synchronized to achieve good phase measurement accuracy. The frequency of the RTD oscillator was locked to an injection signal of 383.2 GHz from an external source, and the phase was controlled by the bias voltage under the injection locking. The measured phase changed from -81 degrees to +73 degrees within the locking range. The bias-voltage dependence of the phase change reasonably agreed with the theoretical expectation.
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