| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a band pass filter with an enhanced performance more than that of conventional band pass filters while preventing increase in insertion loss and upsizing. <P>SOLUTION: The band pass filter is provided with: a conductive case 2 with conductivity wherein at least three or more cavities are formed; an input terminal 3 and an output terminal 4 provided on the conductive case 2; at least three or more semi-coaxial resonance elements 21 to 24 apart from cavity inner walls 51 to 54 and respectively arranged inside the conductive case 2; first coupling windows 55 to 57 formed at the inner walls so that the semi-coaxial resonance elements 21 to 24 are coupled as a stretch between the input terminal 3 and the output terminal 4; and a second coupling window 58 formed at the inner wall so that the semi-coaxial resonance elements 21 and 24 whose coupling is not in a stretch are furthermore coupled. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
