Coaxial Low-Pass Filter Design and Manufacture

In this study, a low-pass filter with coaxial transmission lines is designed and produced. The objective for designing was to utilize both low loss high breakdown voltage capability power microwave applications enable the suppression of second harmonic 4.4-6 GHz C-Band ( selected as proof concept ) signals minimal insertion loss. Microwave 3D electromagnetic simulators were used in design. design started by establishing an 11 th order Chebyshev prototype giving 0.05 dB ripple. Based on prototype, circuit consisting capacitors inductors lumped elements designed. impedances be stepped impedance method, which basis transition lines, decided most suitable manufacturing determined. using these transformed into are used. Coaxial consist conductors insulating material between. While air sections it PTFE (Polytetrafluoroethylene) constant 2.1 sections. manufactured. basic properties manufactured characterized RF measuring devices compared filter. measurements results prove that frequency responses produced very close each other. Namely, cutoff 6 GHz, sharp about 45 at stopband 9 return 20 lines. novelty our work can stated handling increased two techniques. first one highest line radius preventing higher mode excitations decrease conductor Teflon covered around enhance dielectric capability. inclusion also practical level improves characteristics.