LAMINATED BAND PASS FILTER, LAMINATED COMPOUND DEVICE AND COMMUNICATION EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To provide a laminated band pass filter of low loss and high attenuation. SOLUTION: Three strip line conductors 118, 119 and 120 electromagnetically coupled mutually are arranged on the same layer, the first and the second strip line conductors 118 and 119 and the second and the third strip line conductors 119 and 120 are capacitively coupled by capacitors 202 and 203, respectively. The capacitor 202 is formed from capacitive conductors 121 and 123 and the capacitor 203 is formed from capacitive conductors 123 and 122. By making a filter into stepwise configuration, not only the strip line conductor but also all the other capacitive conductors can be formed into structure symmetric to a center between input and output and the electromagnetically symmetric structure is provided.