Re: antenna directivity
HI nhomuathu_hanoi,
Thank you. I have uploaded the hfss design. And I found that in this case the slot on the ground also radiate, so that means I put the boundary too close to the radiation element( I didn't realise that before, so sorry). After I increase the air box below the ground, the problem solved. But would like to talk with me about this structure? I alsl uploaded the paper. I don't know what element radiate. I think the slot radiate, because when I change the slot length , the resonant frequency move accordingly. But when I change the radius of the ring, or the circular patch, the resonant frequency change to oppesite direction. That means, I increase the radius, but the resonant also increase. It is really wierd. I need your help. Thanks!
pudding