wizardz
Member level 2
In RF transformer characterization, maximum available gain (Ga) is widely used to indicate the power transfer performance.
I find in book as "Microwave and Rf Design of Wireless Systems" by Pozar, the Ga is obtained by conjugately matching a two port network.
However, Balun is usually used as a three port device in real circuits. If follow the 2 port network analysis, should Ga of either two ports defined by all three ports conjucated matched? I guess the derivation of Ga in terms of S parameters will be startingly complex.
Or just leave the third port open/short/terminated for example, by50 Ohm? (maybe the termination of the third port has marginal influence on the Ga)
I find the following paper does not give clear definition of this Balun Ga.
I find in book as "Microwave and Rf Design of Wireless Systems" by Pozar, the Ga is obtained by conjugately matching a two port network.
However, Balun is usually used as a three port device in real circuits. If follow the 2 port network analysis, should Ga of either two ports defined by all three ports conjucated matched? I guess the derivation of Ga in terms of S parameters will be startingly complex.
Or just leave the third port open/short/terminated for example, by50 Ohm? (maybe the termination of the third port has marginal influence on the Ga)
I find the following paper does not give clear definition of this Balun Ga.