Theoretical analysis of coupled oscillator array using resonant tunneling diodes in subterahertz and terahertz range
Theoretical analysis of coupled oscillator array using resonant tunneling diodes in subterahertz and terahertz range
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DOI：
10.1063/1.2947600
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发表时间：
2008-06-15
影响因子：
3.2
通讯作者：
Suzuki, S.
中科院分区：
文献类型：
--
作者：
Asada, M.;Suzuki, S.
功率组合和阵列结构是实现亚太赫兹和太赫兹共振隧穿二极管振荡器高输出功率的有效方法。本文分析了RTD耦合振荡器阵列的输出功率和稳定性。首先从二元振荡器阵列的等效电路出发，推导出耦合的范德波尔方程，并给出了只有基模稳定振荡的条件。即使振荡器元件的各个频率不同，由于互注入锁定，阵列的振荡频率也是单一的。分析了保持互注入锁定的各个频率之间的最小差值。对实验结果进行了理论解释。将分析推广到多单元振荡器阵列，得到了振荡模、稳定性、组合输出功率和单元间频差的锁定范围等特性。当单元间频差较小时，理论合成输出功率随单元数增加，与单元数的平方成正比，随频率差减小。还简要讨论了稳定和高功率工作的不同阵列配置。(C)2008年美国物理研究所。
Power combining with array configuration is an effective method for high output power in oscillators with resonant tunneling diodes (RTDs) in subterahertz and terahertz range. In this paper, output power and stability are analyzed for coupled oscillator array of RTDs. The coupled van der Pol equations are derived from the equivalent circuit for two-element oscillator arrays at first, and the condition in which only the fundamental oscillation mode stably oscillates is shown. The oscillation frequency of the array is single due to the mutual injection locking even if the individual frequencies of oscillator elements are different. Minimum difference between the individual frequencies to keep the mutual injection locking is analyzed. Experimental results are explained with theory. The analysis is extended to multielement oscillator arrays, and characteristics of oscillation modes, stability, combined output power, and locking range of the frequency difference between the elements are obtained. Theoretical combined output power increases with element number in proportion roughly to square of the element number if the frequency difference between the elements is small, and decreases with frequency difference. Different array configurations for stable and high-power operation are also discussed briefly. (C) 2008 American Institute of Physics.