Fig. 1. Schematic of generating LFM signal based on OEO

Fig. 2. Simulation of electrical frequency-selected cavity. (a) Spectrum; (b) spectrum of frequency-selected cavity with length variation

Fig. 3. Diagram of generating LFM signal based on OEO. (a) Electrical frequency-selected cavity; (b) OEO cavity; (c) final oscillation frequency

Fig. 4. Output microwave signal of the electrical frequency-selected cavity. (a) Spectrum, R_SPAN=1 MHz; (b) phase noise

Fig. 5. Comparison of microwave signal generated by the proposed system and OEO. (a) Spectrum, R_SPAN=250 kHz; (b) phase noise

Fig. 6. LFM signal. (a) Time-domain waveform; (b) spectrum, R_SPAN=1 GHz

Fig. 7. LFM signal. (a) Frequency-voltage diagram; (b) frequency-time diagram