very importanat please help... antenna?

[ziyas]

i must design a half wave antenna with nec(numerical engineering codes) ,
far field pattern
frekans = 300Mhz
least 25 unknown

radiation pattern?
antenna input impedance?

 

[Steven De Bock]

I'm not sure, but if I remember correctly from the last time I used NEC about 2 years ago, the wavelength was calculated by inserting the frequency into a special field in your NEC gui. Using this wavelength you can calculate the size of your half wave antenna. Then you can draw a wire with this length. Insert a ground plane, insert a voltage source...

Then you could run a simulation delivering the radiation pattern, but also the antenna input impedance.

You can find the NEC simulator I used on the following site:
**broken link removed**