(a) The microstrip hairpin BPF representation and its simulated transmission characteristic. (b) The final structure of the hairpin BPF with open-stub T-shaped nonuniform lines and the replaced quarter-wavelength transmission line of the resonator with equivalent open-stub T-shaped nonuniform lines.
The measured transmission (S21, black curve) and reflection (S11, grey curve) characteristics of hairpin microstrip bandpass filter with nonuniform transmission lines. The characterization temperature is T = 4.2 K.
The measured transmission (S21, black curve) and reflection (S11, grey curve) curves near the passband at temperature of liquid helium.
Microstrip hairpin filter with T-shaped stubs realization.
The parameters of the microstrip hairpin cryogenic bandpass filter measured at 4.2 K.
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