Log Periodic Dipole Array Antenna Example

Hi @aeba

What error did you get?

From your description it looks like you have not yet defined N, so you maybe be getting an error that N is not defined. 

First, Thank you for reply @Peter Futter 

you say that right. how i can define N ? I know if i define N, everything will be okey.

My veriable; tau=0.93                                                                                                                                                                                                                                                                                          sigma0= 0.7

sigma1...sigma11: sigmaN= sigma(N-11)/tau                                                                                                                                                                                                                        Thanks in advance !

I am not sure if I am missing something, but in the same way as you defined the other variables you need to defined a variable N and give it a value.