051021031
Newbie level 5
Hello Everyone,
I want to ask if there is any relation between S11 and S21 for the antenna. Usually we take the antenna as one port device. But If we take the feed port of antenna as one port, and the radiation port of antenna as another port, the antenna becomes two-port device. In this way, I saw one equation, |S11|2+|S21|2=1.
Can anybody tell me more details about the relation between S11 and S21 for the antenna.
Another question is: what is the relation between S21 and antenna gain for the antenna? Are they equal and same or not?
Thank you very much!
Jack
I want to ask if there is any relation between S11 and S21 for the antenna. Usually we take the antenna as one port device. But If we take the feed port of antenna as one port, and the radiation port of antenna as another port, the antenna becomes two-port device. In this way, I saw one equation, |S11|2+|S21|2=1.
Can anybody tell me more details about the relation between S11 and S21 for the antenna.
Another question is: what is the relation between S21 and antenna gain for the antenna? Are they equal and same or not?
Thank you very much!
Jack