UWB circular antenna: input impedance (Zo= 50 Ω)

Thread Starter

Luiz Fernando Vieira

Joined Aug 24, 2015
I'm having difficulty with the line input impedance of the circular planar antenna signal. Its impedance is 117 ohms and the correct is 50 ohms, I am not able to lower the value. I made modifications to the input increasing the line width and also made an impedance transformer. When I get it down, the whole process on the antenna I made is impaired. Example: reflection coefficient is lost, surface current loses efficiency and also its power and directivity. Please can someone help about this.

abaixa impedância.png

look me value