RF Transmission Questions?

Question

Is there a way to direct a RF signal at a specific RF device (ie like pointing it at the specific device similar to what you'd expect in a line of sight IR scenario), even if there are other RF devices in the same room? I like the benefits of RF being able to travel a great distance, but am trying to overcome a scenario where i can send the signal via RF, but that its received by identical other devices.

what im trying to accomplish is a scenario where a signal can be transmitted (and ideally received as well) over a distance of approximately 30 ft to a specific RF device, but without the scenario of sending that same signal to an unintended other (similar or identical) RF device.

I've heard of Z-wave, and it seems like that technology might reach the distance I'm looking for, but i don't know how to address the other concern of transmitting unintentionally to other RF devices. Is there something better or different then Z-wave that achieves hat I'm looking for.

Thanks

Answer 1

There are antenna designs which can focus RF such as yagi, corner reflectors and parabolic dishes just to name a few

Answer 2

Without knowing the specifics of your scenario ie. (frequency constraints, transmission device, recieving antenna) you could try to phase match your transmission line at a known frequency. Phase matching is often used in CEM type devices and has become increasingly popular in aeronautical applications. 30 ft is not a very far distance to be using RF communications especially in Microwave LOS applications. You may overpower your end equipment. Just FYI if you thought of microwave. Let me know if you can elaborate and I can be of more assistance.