Multiorder-Cascaded Matching of Coupling Structures for High-Efficiency Phase Locking Between Multiple Magnetrons
Liangjie Bi, Qiong Zheng, Hailong Li, Yu Qin, Minsheng Song, Xuedong Wang, Pan Cui, Dagui Shen, Rui Guo, Xiao‐Lian Zhang, Haixia Liu, Wanshan Hou, Licun Wang, Wenlong Li, Bin Wang, Lin Meng, Yong Yin
Abstract
The scheme of a high-efficiency phase locking based on a novel multiorder cascaded coupling structure is proposed to establish a high-power <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$2\times 2$ </tex-math></inline-formula> array consisting of four megawatt-level, S-band magnetrons. Every magnetron is designed with only one coupling port to match the cascaded coupling structure, in which a matched, cascaded, standing-wave field is built up to support the phase-locked mode with 0 phase difference between them. To obtain high-efficiency phase locking, the two-order, cascaded, standing-wave field is produced with a small portion of stored energy, which matches with four <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\pi $ </tex-math></inline-formula> modes in four magnetrons. Particle-in-cell (PIC) simulation results show that a 0-phase difference between four magnetrons is obtained with every magnetron delivering a peak power of 2.4 MW, which is almost the same as the power of a free-running magnetron. The array can deliver a total power of up to 9.6 MW. The power conversion efficiency of the array is 65.2%, which is almost the same as that of the free-running magnetron. This demonstrates the high-efficiency phase locking. The scheme is promising in developing a large-scale array for higher-power microwave generation.