andi_
Newbie level 6
Hello, I'm a beginner, designing a diamond-shaped patch antenna fed with quarter-wave feedline for 50Ω matching exited by a waveguide port in CST MWS. I got Smith chart result as in the attachment with Z=95.69Ω for S1,1.
My problem is, I'm not sure this impedance stands for the impedance of the antenna or the impedance of the waveguide port. And since to design a ¼-wave transmission line, antenna impedance needs to be known, [Zin = sqrt(Z0*ZA)], how do I get it's value?
I tried with feeding the antenna with a 50Ω µstrip, and add a marker on the Smith chart for my freq., 5.7GHz, get abs(Z) and do the Zin calculation. Is this the correct way?
And how to choose waveport size? The result in the attachment is obtained with waveport width = width_of_50Ω_line and height = height_of_track + height_of_substrate + height_of_ground.
Thanks in advance.
My problem is, I'm not sure this impedance stands for the impedance of the antenna or the impedance of the waveguide port. And since to design a ¼-wave transmission line, antenna impedance needs to be known, [Zin = sqrt(Z0*ZA)], how do I get it's value?
I tried with feeding the antenna with a 50Ω µstrip, and add a marker on the Smith chart for my freq., 5.7GHz, get abs(Z) and do the Zin calculation. Is this the correct way?
And how to choose waveport size? The result in the attachment is obtained with waveport width = width_of_50Ω_line and height = height_of_track + height_of_substrate + height_of_ground.
Thanks in advance.