The main objectives of this thesis are to use the two kinds of subtrates (Rogers Duroid Ro3850 and Rogers Duroid Ro5880) to design the 40~48GHz coupled-line filters and the 59~62GHz coupled-resonator filters. Specifically, the results for these two subtrates under same specification are carefully examined and compared .
In order to apply to the high frequency system, not only the complete design process of the housing of filter, but also the improvements and the measurement results are presented in this thesis.
