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Does one need a mathematical model of coupled-resonator filter to use TDR?

Question asked by drkirkby on Mar 1, 2014
Latest reply on Mar 6, 2014 by drkirkby
Someone has asked me to tune a notch duplexer that needs tuning for frequencies around 460MHz. I don't know the design of this, as I don't have it yet, but it is likely to be a coupled resonator filter of some sort. I wonder if the TDR thing that Joel worked on for his Ph.D. can be used, if I do not have a mathematical model of the filter. I noted that Agilent used to sell some software for this, but I got the feeling that one needed a model of the filter to start with, which is fine if you have designed it from scratch, but not so useful if you have an unknown design. 

Clearly a 3 (or more) port VNA is the ideal tool for this, but I only have a 2-port 8720D, but it does have the TDR option. I am wondering if that can be used to help do this.