| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a bandpass filter having two pass bands which can be made broadband and has high flexibility of design of the pass band, and to provide a radio communication module and a radio communication device using the bandpass filter. <P>SOLUTION: The bandpass filter includes: first-third resonance electrodes 31a, 31b and 31c configuring first-third resonators; fourth and fifth resonance electrodes 31d and 31e configuring fourth and fifth resonators; a first input/output coupling electrode 40a electromagnetically coupled with the first and fourth resonance electrodes 31a and 31d; a second input/output coupling electrode 40b electromagnetically coupled with the second and fifth resonance electrodes 31b and 31e; and a resonator coupling electrode 43 for electromagnetically coupling the first and third resonance electrodes 31a and 31c. The resonance frequencies of the first and second resonators are equal and are different from that of the third resonator, and the resonance frequencies of the fourth and fifth resonators are equal and are different from that of the first-third resonators. A first pass band is formed using the first-third resonators, and a second pass band is formed using the fourth and fifth resonators. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
