60GHz is actually poor for through-wall detection as this frequency is heavily attenuated by building materials - lower frequencies like 24GHz or UWB radar would be more suitable for both applications you mentioned.

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amelius 3 days ago | parent [-]

Why do you say 24GHz and not, e.g., 100MHz? (Apart perhaps from it being within a reserved band).

	▲	mikewarot 3 days ago \| parent \| next [-]
		An antenna large enough to work at 100 mhz would be impractical. That's a wavelength of 3 meters, and incapable of reliable detection of objects less than about 0.7 meters in all dimensions (1/4) wavelength, not to mention the required size of the antenna array
	▲	amelius 2 days ago \| parent \| prev [-]
		Update: chatgpt told me that the wavelength (3m) is too large to detect humans, antenna size would be impractical, more power would be needed for transmission, and reflections are more of a problem than with higher frequencies.