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Radar to detect mosquitoes?

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PartialDischarge:
Hypothetically speaking, what kind of radar (frequency, size, antenna type...) would work in detecting and tracking a mosquito flying in a medium sized room (5x5m for example).
Mosquitoes do not fly fast but are tiny, yet bats detect them with ultrasounds (100-300kHz). I wonder if ultrasounds would work or some GHz radar would be needed to detect and track its position.
To avoid mechanical movements I guess an active phased array would be most suited for this application.

Again this is just a hypothetical discussion of possible approaches to detect and track the position of such unwelcome creatures.

OM222O:
if you want to use radar to detect them, you need them to be at minimum half the wavelenght but that doesn't produce very reliable detection method. Ideally they're one full wavelenght. I'm too lazy to calculate but that seems way too high to be actually doable (for a cheap DIY method that is, ofc you can build a whole radio tower for the application if you're rich).

For the ultrasonic idea: won't work. I'm not sure how bats do it but if you have ever used an ultrasonic sensor, you'd know how inaccurate their beams are.

magic:
No radar expert here, but the speed of light is about million times higher than the speed of sound in the air, so you will need a million times higher frequency to achieve the same wavelength and, presumably, resolution.

Berni:
As others said you need the wavelength to be about as small as what you are trying to see. So about 100GHz gives you 3mm wavelength and an antenna that is about half that size.

Good luck building that.

chickenHeadKnob:
The simplest and lowest cost is to mimic the way humans trying to sleep in a tent detect them. Have an array  of three or more sensitive microphones detect the buzzing of their flight and triangulate with some audio frequency DSP.

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