Do you know where can i find information about which radio frequency to use in some application scenarios?
For example, a coal mine. There is lots of rock to traverse... Which frequency should I choose to traverse the rock. 912Mhz? 433? 2.4 ghz?
Another example, a chemical plant which has lots of outdoor metalic pipes. Suppose you need to put some wireless sensor nodes to study some physical phenomenum. Which is the best frequency for those sensor nodes (more imune to reflection on the metalic pipes, etc)
Do you know any studies about this subject? Or studies about the behaviour of the different RF frequencies in the presence of different materials?
Thanks a lot