| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a band-pass filter of simple structure, preventing the deviation of ground potential between the substrate side and the case side while suppressing a loss. <P>SOLUTION: The band-pass filter includes: a substrate 10 having a base material 11 formed in a tabular shape; a conductive case 20 having a first recess 21 and a second recess, recessed from a reference surface 20a detachable to one face 11a side of the base material, and a window 24 formed to communicate between the first recess and the second recess; and a conductive member 40 disposed on the other face 11b of the base material. The substrate includes: a ground pattern 12 disposed on one face and capable of contacting to the reference surface of the case; a wiring pattern 13 disposed between the base material and the first recess on one face in a state apart from the first recess; and a connection member 15 for electrically connecting the ground pattern to the conductive member. On the case, there is disposed a conductor 30 extending from the internal face 21a of the first recess toward the wiring pattern in a manner to form a gap between with the wiring pattern. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
