sandeepsreeman
Member level 1
hi frnds i want to design a combline bandpass filter of order n=3 (so there should be 3 resonators).i want to design using transformed coupled lines.what abt n=0 and n=4 lines?(what are they called?) i studied that there are not resonators.how to find the length of those lines and i have to give 50 ohm feed to n=0 and n=4 lines . what is the value i have to take for Yai(resonator admittance)..i am getting problem to find the lumped capacitance value (in the design equations there is cotangent of electrical length is there iam using quarter wave resonator for design) plz help for design equations for combline and spacing betwenn the resonators ...... i referred to text book of microstrip filters for rf/ microwave applications by lancaster and hong ....but i couldnt understand how they designed...plz help