Key result
Using a linearly polarized single patch antenna at the transmitter and a circularly polarized antenna array at the receiver boosted the heart rate detection accuracy of the radar by an average of 11% compared to standard antennas.
Optimizing antenna polarization and array configurations significantly improves the signal quality and accuracy of noncontact Doppler radar heart rate monitoring systems.
May enhance noncontact radar heart rate monitoring; leaves open clinical validation before practice adoption.
This communication investigates the effects of antenna radiation parameters on the detection capabilities of a continuous-wave 2.4-GHz Doppler radar used in noncontact heart rate monitoring systems. Four different types of patch antennas and array configurations were implemented on the transmitter and receiver sides. Extensive experiments using a linear actuator were performed, and several important observations were reported. A specific configuration of antennas was shown to result in the highest signal quality and system performance. Proof-of-concept experiments on human subjects further validated the suggested results, showing that the recommended antenna arrangement boosts the radar detection accuracy by an average of 11%.
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Nosrati et al. (2017) studied Healthy subjects (heart rate monitoring) (n=5). Linearly polarized single patch antenna at transmitter and circularly polarized antenna array at receiver vs. Linearly polarized single patch antennas at both transmitter and receiver was evaluated on Heart rate detection accuracy at 1.5 meters (11% higher detection accuracy). Using a linearly polarized single patch antenna at the transmitter and a circularly polarized antenna array at the receiver boosted the heart rate detection accuracy of the radar by an average of 11% compared to standard antennas.
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