How is it that the multiple antennas on a radio frequency jammer don't interfere with each other?

Thread Starter

genekuli

Joined Oct 21, 2018
103
What sort of interference are you expecting?
I thought that since antenna designs were so precise and every element needed to be put in an exact position and have an exact dimension, that the whole set of antennas on the jammer are in fact acting as just one complex antenna with multiple elements, so how is it that that does not happen? What about all the inevitable capacitive and inductive coupling that would happen in the nearfield between each antenna? surely that they would have to have an effect?
 

Yaakov

Joined Jan 27, 2019
2,353
I thought that since antenna designs were so precise and every element needed to be put in an exact position and have an exact dimension, that the whole set of antennas on the jammer are in fact acting as just one complex antenna with multiple elements, so how is it that that does not happen? What about all the inevitable capacitive and inductive coupling that would happen in the nearfield between each antenna? surely that they would have to have an effect?
Those antennas are trash anyway. They are almost certainly very poorly matched. The whole things is just a big utterly illegal RF hammer. They aren't concerned about antenna performance.
 

Thread Starter

genekuli

Joined Oct 21, 2018
103
Those antennas are trash anyway. They are almost certainly very poorly matched. The whole things is just a big utterly illegal RF hammer. They aren't concerned about antenna performance.
yes, i am not interested in them as jammers, just using the example, i was just hoping to find out the antenna theory concept of having multiple antennas in such proximity. so would you agree that the antennas would interfere with each other? just so that i can understand the antenna theory aspect of it.
 

Yaakov

Joined Jan 27, 2019
2,353
yes, i am not interested in them as jammers, just using the example, i was just hoping to find out the antenna theory concept of having multiple antennas in such proximity. so would you agree that the antennas would interfere with each other? just so that i can understand the antenna theory aspect of it.
Antennas are mounted in each others near field on every shared transmission tower. Research that.
 

anniel747

Joined Oct 18, 2020
421
For example this unit has 16 antennas that are all radiating concurrently, how is it that the antennas do not interfere with each other since they are all in each other's near-field and are capacitively coupled? And maybe even inductively coupled because of the loading coils that are so close to each other?
View attachment 233640https://www.jamexptec.com/16-antenn...equency-jammer-from-130-2700mhz-p00144p1.html
Radiation pattern is probably all over the place.
 
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