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- Resonance open circuited quarter wavelength

Hello everyone,

I am studying transmission line resonators and in particular I was considering a particular case of resonator where I have an open circuited quarter wavelength transformer of high impedance terminating a regular 50 ##\Omega## line. If I look at the input impedance from the open end of the circuit I get that its real value reaches a maximum when the resonant frequency condition is matched (the one of the quarter wavelength) and at the same time the imaginary part is 0 and I think to understand this quite well. What surprised me is that there are other points in frequency where the imaginary part of the impedance becomes 0 while the real part reaches exactly 50 ##\Omega## and this happens exactly between two consecutive resonances. I was wondering what is the physical meaning of these points. Are they anti-resonance point? Or it means that at these specific frequencies my whole circuit just behaves like a regular 50 ##\Omega## line?

I hope I was clear enough and that some of you might help me to understand.

Thanks and happy holidays to everyone!

I am studying transmission line resonators and in particular I was considering a particular case of resonator where I have an open circuited quarter wavelength transformer of high impedance terminating a regular 50 ##\Omega## line. If I look at the input impedance from the open end of the circuit I get that its real value reaches a maximum when the resonant frequency condition is matched (the one of the quarter wavelength) and at the same time the imaginary part is 0 and I think to understand this quite well. What surprised me is that there are other points in frequency where the imaginary part of the impedance becomes 0 while the real part reaches exactly 50 ##\Omega## and this happens exactly between two consecutive resonances. I was wondering what is the physical meaning of these points. Are they anti-resonance point? Or it means that at these specific frequencies my whole circuit just behaves like a regular 50 ##\Omega## line?

I hope I was clear enough and that some of you might help me to understand.

Thanks and happy holidays to everyone!