高效率高功率高增益寬頻諧波磁旋行波放大器之理論研究

Theoretical Investigation of Harmonic Gyrotron Traveling Wave Tube Amplifier with High Efficiency, Power, Gain, and Broadband Capabilities

張舜喬(Shun-Chiao Chang)

指導教授 ： 朱國瑞

國立臺灣大學/理學院/物理研究所/碩士(2012年)

https://doi.org/10.6342/NTU.2012.00110

摘要

高功率寬頻磁旋行波放大器已經被應用在衛星通訊和毫米波雷達，它可以在Ka-band，涵蓋頻率26.5-40 GHz，提供更高的解析度和在濃霧或煙霧情況下穿透更深入。就如同我們所知，對於在第二諧波操作的磁旋行波放大器的效率，導致於功率，都因為諧波迴旋交互作用和潛在的非線性效應而被嚴重的限制。從對於對流不穩定性， 模式，塗損耗的磁旋行波放大器的研讀，了解這有利於極高增益和寬頻的操作，高效率高功率則可以藉由強化諧波迴旋交互作用來達成。數值模擬計算的結果讓我們知道，藉由我們的方法，二次諧波操作的磁旋行波放大器的飽和效率和功率可被大大的提升。此外，這結果也提供一個提升效率的方案對於這種有利於更低的磁場需求的二次諧波操作。

關鍵字

磁旋行波放大器 ； 毫米波 ； Ka-band ； 諧波迴旋交互作用 ； 非線性效應 ； 對流不穩定性 ； TE11模式

並列摘要

High power and broad-band gyrotron traveling wave tube amplifier (gyro-TWT) is employed in satellite communication and millimeter-wave radar which provides higher resolution and penetrates deeper under foggy and smoky conditions in Ka-band that covers the frequency of 26.5-40 GHz. As is well known, the efficiency so as to power capability of gyro-TWT in second harmonic operation was significantly restricted by harmonic cyclotron interaction strength and inherent nonlinear effect. Beginning from the study of convective instability, TE11 mode, distributed-loss gyro-TWT which features the ultra-high gain and broad-band operation, the high efficiency as well as high power second harmonic gyro-TWT could be achieved by enhancement of harmonic cyclotron interaction. The simulation work indicate that the method profoundly strengthen the performance of saturated efficiency as well as saturated power for second harmonic gyro-TWT. The results provide a remedy of efficiency for second harmonic operation which favors less magnetic-field requirement.

並列關鍵字

gyro-TWT ； millimeter-wave ； Ka-band ； harmonic cyclotron interaction ； nonlinear effect ； TE11 mode

參考文獻

[1] K.R. Chu, Rev. Mod. Phys. 76(2), 489, 2004.

[2] P. Forman, Rev. Mod. Phys. 67, 397, 1995.

and T. M. Antonsen, IEEE Trans. Plasma Sci. 48, 108 (2001).

D. E. Pershing, IEEE Trans. Plasma Sci. 30, 885 (2002)

26, 500 (1998).