How many carriers for phased array?

[Esquilo]

Good morning, I haven't been to the forum in a while and I've been having problems with my email. I hope everything is fine now. As per the title, I'd like to create pulses (5Hz - 8Hz) in specific regions of space. For example, 5Hz arrives in one area, and 8Hz is nearby. To create this effect, I'd like to use phased arrays with 16 patch antennas, but I'm unsure whether to use a single carrier frequency of 800MHz and then pulse at 5Hz and 8Hz, or use two carrier frequencies to avoid interference between the spaces. So, how many carriers should I use to avoid interference between the spaces

 

[.Scott]

I think you might as well go with two carrier frequencies. Either way, you will need two beam-forming circuits that are independently gated then added together. Especially with only 16 elements, you should get fewer artifacts with separate frequencies - you will avoid regions of unintended persistent constructive or destructive interference..

 

[berkeman]

So, how many carriers should I use to avoid interference between the spaces

Can you say more about the application? How "nearby" are the two areas, and how far are the areas from your antenna array? Why have you chosen 800MHz as the carrier frequency? What sort of receiving things are in the two areas?

 

[Esquilo]

I think you might as well go with two carrier frequencies. Either way, you will need two beam-forming circuits that are independently gated then added together. Especially with only 16 elements, you should get fewer artifacts with separate frequencies - you will avoid regions of unintended persistent constructive or destructive interference..

Thanks for your reply, using two carriers, one 800 MHz pulsed at 5 Hz pointing to one area and one 700 MHz pulsed at 8 Hz pointing to another area, if the two waves interfere in a space of a few centimetres I get the beating of the carriers (100 MHz) and the beating of the pulses (8,3,5,13 Hz) so too much interference