Microwave Transmission System Based on Slot Antenna Spatial Mutual Coupling Injection Phase-Locked Magnetron Array

This paper proposes a slot antenna specifically designed for phase-locked magnetron arrays, where the spatial coupling strength and coupling phase are engineered to enable phase-locking while maintaining efficient radiation, extending the functional and application scope of the slot antenna from a conventional radiator to one that simultaneously enables magnetron phase-locking and radiation. The system has been fabricated and tested. The antenna exhibits gains of 21.21 dBi and 21.10 dBi under low-power chamber testing and full-power magnetron operation, respectively, with sidelobe levels of -12.9 dB and -11 dB, and radiation efficiency of 92.68% and 90.36%. Analysis of the time-domain signals of the magnetron array reveals a stable zero-phase-difference phase-locked state. Additional power synthesizing tests show that the system achieves 96.91% spatial coherent synthesizing efficiency. The agreement between time-domain phase analysis and power synthesizing experiments provides mutual verification, collectively confirming the zero-phase-difference phase-locked state enabled by spatial mutual coupling injection of the slot antenna. The system operates stably at 2.467 GHz with an output power of around 8238.19 W.