Looking at the graph below, i can see that HPBW of the main lobe is around 45 degrees, but when it comes to identifying the FNBW i have trouble understanding it. Reading various articles online i've seen it mentioned that FNBW is around twice HPBW.

My approach was to look for a point in which the radiation power starts increasing after the main lobe and that would mean i've found a side lobe, thus having a null between main lobe and side lobe. For the diagram below, this would mean ~ -145 degrees and +120 degrees (power graph is on the right, amplitude is on the left) and obtain a FNBW of about 100 degrees that would coincide with about twice the width of the HPBW. Is this correct?

I am unsure whether this is correct as the power for those points is not 0. The only points with 0 power are at around +/- 25 degrees.

enter image description here


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.