Hi Shaikss,
for people (like me) that can't open hfss files, could you post drawings/plots of the antenna design?
Regards
Z
If you have really followed the steps.then i would say the only way you are not getting a perfect vswr if you not got your units properly. thats the only way i can see it.
Regards
Shaik i've figured out the problem with your design it was merely the rectangle that was used as a feed was way too small.i was wrong about it ,when i looked back,i meant feed of the rectnalge should be lambda/10 and not 100.Hope that helps
Now you will see a good resonance at your frequency
Regards
I will try to implement these changes and see how it goes. But I am very thankful to you. You have suggested and helped me a lot.
Thanks once again.
Well shaik if you increase the size of the rectangle,it literally increases the size of the dipole changing the resonant length.so you will have to decrease the size of the dipole length to get the proper resonance.simple as that
Regards
if you decrease the size of the rectnagle, length of the antenna decreases implying increasing in frequency and increase in the antenna size leads to decrease in frequency and vice versa.
Simple as that.
Regards
Well shaik if you increase the size of the rectangle,it literally increases the size of the dipole changing the resonant length.so you will have to decrease the size of the dipole length to get the proper resonance.simple as that
Regards
For that sake, I have increased the resonating length of the dipole. I guess the amount with which VSWR is decreasing is not in proportion with the antenna length. I still need to increase the dipole length.
In between, I have a doubt. Normally dipole antenna length is little less than half the wavelength. What happens if it is slightly greater than half the wavelength inorder to see a good VSWR? Is it a good design? Or the design should need additional changes?
Thanks!
shaikss,
A 'Normal' dipole in free space exhibits impedance at resonance of 72 to 73 Ohms (so say the text books on the subject) ... so VSWR will never be 'perfect' if referenced or 'measured' in a 50 Ohm system ....
Having said the above, I just noticed in the HFSS "Project Tree", under "Excitations" => source => "Properties" that it shows "79" Ohms in the window for "Full Port Impedance" (for what ever this is worth!)
I have much to learn about HFSS so I cannot offer any more guidance or advice on this, we need input from veterans and experts on this.
Jim
shaikss,
A 'Normal' dipole in free space exhibits impedance at resonance of 72 to 73 Ohms (so say the text books on the subject) ... so VSWR will never be 'perfect' if referenced or 'measured' in a 50 Ohm system ....
Having said the above, I just noticed in the HFSS "Project Tree", under "Excitations" => source => "Properties" that it shows "79" Ohms in the window for "Full Port Impedance" (for what ever this is worth!)
I have much to learn about HFSS so I cannot offer any more guidance or advice on this, we need input from veterans and experts on this.
Jim
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