The demodulation data controlled the motors successfully

Study on a 5.8GHz Injection-locked Magnetron for Transferring Data

Bo Yang*+, Tomohiko Mitani*, Naoki Shinohara*
*Research Institute for Sustainable Humanosphere,
Kyoto University
Uji, Kyoto, Japan, 611-0011
+yang_bo@rish.kyoto-u.ac.jp

978-1-5386-5717-1/18/$31.00 ©2018 IEEE

injection signal stabilizes the magnetron oscillation frequency. A phase locked loop (PLL) method controlled the magnetron phase and the magnetrons worked in a low noise level [3]-[6]. The injection-locked magnetron was applied in a wide area, like wireless power transfer [3]-[4], power combining [5], and communication [6].

Figure 2 shows a block diagram of the injection-locked magnetron for the FSK modulation system. A LabVIEW program was designed and output the motor control signal to the modulator (Pakite PAT-630 transmitter) through the RS-232 TxD port. The modulator modulated the control signal on the microwave by FSK. This FSK modulated signal was amplified to 10 W and via a circulator, injected to the magnetron (Panasonic M5802). Here, the modulation frequency was nearly at the magnetron oscillation frequency. Then, the magnetron followed the modulated signal and amplified it. Then the high-power modulated microwaves were transmitted through the antenna. At the receiver, the transmitted microwaves were received and demodulated by a frequency demodulator (Pakite PAT-630 receiver). Then a

Circulator

Fig.1 Schematic of data transfer system by FSK modulation

We demonstrated a 5.8 GHz injection-locked magnetron could transmit the motor control data by FSK modulation. Through the transmitted data, we successfully controlled the electric trolley. In the future, we will build a wireless power and data transfer system for the electric trolley.

ACKNOWLEDGMENT

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