I have interfaced HB100 sensor with ATMega Microcontroller. It easily detects my hand movement upto 5-6 inches only. I want to extend range of the sensor so that it detect movement upto atleast 10meters. I see people use Dish antenna. For that it requires LNB, I have no knowledge of RF can someone please suggest how do I select LNB for HB100? Or any other way to extend the sensing range which can save me from LNB stuff? Thanks
Taking a look at a teardown of the HB100 module, it appears that the antenna is a pair of two-element patch arrays (one for TX, one for RX) on the back of the board. There's no coaxial out. It'll be very difficult to bodge it into a standard feed horn for a dish.
You might be able to install the module itself at the focus of an old VSAT dish, with the antenna face of the module pointed at the reflector. This isn't super ideal: the patches aren't designed to be a dish feed, so your aperture efficency will likely be pretty awful as you won't illuminate the whole dish and/or you'll have signficant spillover. But, it might work in a pinch.
Either way, keep in mind that you are increasing the EIRP of the module by doing this, and that you may run into regulatory issues if it's too high. I'd suggest learning more about RF and radar before attempting this.