Design and Analysis of Low-frequency Microwave Resonator for Signal Accumulation and Amplification

The microwave resonant cavity has a resonance accumulation effect on electromagnetic waves, which enables it to increase the amplitude of the received signal by combining with the receiving antenna. In this paper, a cylindrical microwave resonant cavity working at 2.45GHz is designed, and a pair of dipole antennas are connected to the input end of the cavity. Additionally, a digital switch connected to the output end of the resonant cavity controls the accumulation and release of energy in the cavity. The resonance accumulation effect of the resonant cavity is verified by comparing the output of the cavity with that of the antenna. After design and simulation, a resonant cavity with a length of 225mm and a radius of 60mm is proposed. The signal becomes a high amplitude pulse after passing through the cavity, which is 28.3dB higher than the output of the antenna.