earticle

영어

In this paper, the design method of stub bandpass filter (BPF) is suggested by equations of the tapped-line geometry and the λg/4 stub BPF with T-type inverter is implemented for the harmonic suppressing for ISM band. Design parameters for the tapped-line geometry are obtained using the equivalent circuit of the J-inverter for the filter prototypes and the T-type inverter is realized by the equivalent circuit of the quarter wavelength transmission-line. The harmonic suppressed λg/4 stub BPF is fabricated on Teflon substrate and its harmonics of the λg/4 stub BPF are suppressed over 30 dB up to 10 GHz.