Good morning, I have a project with phased arrays, I would like to create areas in the space in which there is a single pulsation frequency for example 5 Hz, and in another area next to it it must pulse at 8 Hz, to do this I would like to use a phased array with 16 patch antennas, in which there is an 800 MHz carrier pulsed at 5 Hz or 8 Hz, so to avoid interference between the two areas is it better to use a single 800 MHz carrier or two carriers of 700 MHz and 800 MHz??

 

Before radiating any pulsed signals, at least in the USA, you need to see the rules about radiating RF. Check with the FCC. In most parts of the world, radiating RF signals is regulated.

 

Before radiating any pulsed signals, at least in the USA, you need to see the rules about radiating RF. Check with the FCC. In most parts of the world, radiating RF signals is regulated.

no no it does not concern exposure to humans or other living beings, it is a musical project, in fact the array is very directive and will not involve living beings

 

700 MHz and 800 MHz

Other people and companies are transmitting information on those frequencies. You will interfere with that.

 

Other people and companies are transmitting information on those frequencies. You will interfere with that.

absolutely not because the effect is local only for 1 meter from the source, non-radiative near field Fresnel zone,

 

absolutely not because the effect is local only for 1 meter from the source, non-radiative near field Fresnel zone,

Absolutely maybe. Phased arrays work with propagating signals because you need phase stable fields to be combined. 1 meter is ~3 complete wavelengths at 800MHz. That's the radiative near field.
https://en.wikipedia.org/wiki/File:Phase_array_sweep.webm

https://www.analog.com/en/resources...cles/phased-array-antenna-patterns-part1.html

 

Absolutely maybe. Phased arrays work with propagating signals because you need phase stable fields to be combined. 1 meter is ~3 complete wavelengths at 800MHz. That's the radiative near field.
https://en.wikipedia.org/wiki/File:Phase_array_sweep.webm

https://www.analog.com/en/resources...cles/phased-array-antenna-patterns-part1.html

View attachment 364556

checked carefully and for an array with planar patch antennas 50 centimeters wide on each side, the Fresnel zone starts at 1 meter, this is the suitable zone, so I confirm that my receiving antenna will be 1 meter away from the array, you also have to calculate the size of the array, the wider it is the more the Fresnel increases

 

Sure, that RF energy will magically disappear after 1 meter.

 

Certo, quell'energia RF scomparirà magicamente dopo 1 metro.
[/CITAZIONE]
Exactly

 

First, my comment was about the legal aspects, not about human or animal safety. RF signals at different pulse rates? Somehow related to music??
I suggest light from infra-red LEDs, and sensitive photo-sensors. That wil nbe much simpler and also a lot less expensive.
If you are hoping to invent a musical instrument using RF to control pitch and volume, it has been done MANY years ago, it is called a THEREMIN, invented in the era of octal elelctron tubes. Also a whole lot of wonderful sounds on a device created by some guy named "MOOG."