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The research of vital sign radars using microwave technologies grows rapidly in recent years. Such type of radars, whether using continuous-wave (CW), ultra-wideband (UWB), or other types of signals, spurred interests and new applications because of the capability of detecting respiration and heartbeat without any sensor device contacting the body. Several applications that may potentially save lives...
This paper presents two dual-channel antenna arrays for harmonic radar applications. The first design contains two four-element circular patch antenna arrays, where one array is used for transmitting a signal at fo of 2.4 GHz and one for receiving the second harmonic of the transmitted signal. This design measures 1.28 λ × 1.28 λ × λ/50 at 2.4 GHz, weighs 49.5 g, and has a measured gain > 12 dBi...
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