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Reflection loss (s11) plot of reflectarray antenna

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Amra

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Hello!
Can any one help me regarding the reflection loss plot of reflect array antenna vs frequency ? How much it Should be at resonant frequency?
plzz plzzzzzzzz Helpp!!!
I will be Thankfull :)
 

jiripolivka

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Hello!
Can any one help me regarding the reflection loss plot of reflect array antenna vs frequency ? How much it Should be at resonant frequency?
plzz plzzzzzzzz Helpp!!!
I will be Thankfull :)

Any good antenna should have S11 high (SWR close to 1:1) for a good radiation efficiency.
It means its impedance is well matched to the transmission line.
Compromising antennas allow S11 to be lower than 20 dB=this means power is reflected back to the line, not radiated.
 

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