Why does the pattern go wrong when my freq goes to high fre

hello,

I simülated my antenna and compared simülation patterns and experimental patterns. I have intersting solution. I ı am comfused. the pattern go wrong when my freq goes to high freq. Why does my pattern structure go to wrong on high freq? I am not able to understand.. can you help me?

Hi h_cet,

Phase will vary with respect to the frequency. since Phase is varied your pattern

will get tilted.Basically Electrical tilt antennas are designed by applying constant

specific phase difference between antenna elements.

what type of antenna is it?....usually printed antennas are frequency dependent.....u have to define a broadband feed transition to achieve identical patterns at desired frequencies

hello,

firstly thank you ver mucu for your helps....

My antenna is broadband antenna.. the pattern direction of antenna is chanched by freq which is gone to high freq. I deifned waveguide excitation. but it created a pattern problem. unfortunately I dont know how to define a broadband feed transition. İf you can show how to do it, I will be glad. moreover, can you give some informations which is about excitations which are related to different antennas to me?

Thanks for your helps....