Respiratory Pattern Recognition of an Adult Bullfrog Using a 100-GHz CW Doppler Radar Transceiver

A 100-GHz continuous-wave (CW) Doppler radar transceiver is proposed for recognizing an adult bullfrog's unique respiratory pattern, which contains buccal and lung ventilations. With two horn antennas, the detection system working at 99 GHz is set up, and the bullfrog's body vibration caused by the buccal motion and the lung burst is detected. According to the results by detecting the front side of the bullfrog, the buccal ventilation shows a regular moving rhythm around 72 bpm under 23°C. By detecting the flank of the bullfrog from the right side direction, the buccal motion and lung burst are successfully recognized based on their different motion strength, whereas the lung burst shows an irregular rhythm. To authors' best knowledge, this is the first time that a bullfrog's respiratory pattern is detected by a CW Doppler radar working at such high frequency.