I have InnoSenT SMR-314 and SMR-334 radar sensors that have quite wide horizontal radiation pattern of over 100 degrees (see datasheet on page 3). I would like to make the sensors far more directional - thinking about 15 degrees or so. Is it possible to mount some kind of antenna on top of the sensor to solve this issue? I want a low-cost solution - will a 3d printed horn antenna work?
The radar sensor is a SMT device and will be soldered on a PCB. From the physical point of view I wonder what king of mount would be needed for the horn antenna to work. The idea is to mount a single antenna to the whole sensor and make the hole in antenna flange big enough so that whole sensor fits in there. Also not sure whether the antenna needs to be grounded to the PCB or can be left unconnected.