Patent ID: 7369017

Claim:
A microstrip type bandpass filter, comprising: an input terminal for receiving a predetermined signal; an output terminal for outputting a selection signal in a characteristic band; a first resonator electrically coupled with at least a portion of the input terminal; a second resonator electrically coupled with at least a portion of the first resonator; and a third resonator electrically coupled with at least a portion of the output terminal and the second resonator; wherein a cross coupling gap having a predetermined interval is formed between the first resonator and the third resonator; and the cross coupling gap is formed in a magnetic coupling such that an attenuation pole characteristic is generated at the upper side of a passband; said microstrip type bandpass filter further comprising a cross coupling line that overlaps at least a part of the first resonator and at least a part of the third resonator; said bandpass filter comprising a capacitive coupling comprising the cross coupling gap of the predetermined interval between the first resonator and the third resonator in combination with an inductive coupling comprising the cross coupling line and said parts of the first resonator and the third resonator.