| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a band-stop filter capable of obtaining a steep stop characteristic and a large stop amount although being compact. <P>SOLUTION: The band-stop filter includes: a high-frequency circuit board 3 having a ground layer formed on the reverse surface of a dielectric; a main microstrip transmission line 5 formed on the top surface of the dielectric of the high-frequency circuit board 3 and transmitting a high-frequency wave signal; and a resonator 6 which has a coupling line formed on the top surface of the dielectric of the high-frequency circuit board 3 by arranging a microstrip transmission line 7a having a wavelength 1/4 time as long as a wavelength at a passing center frequency in parallel to the main microstrip transmission line 5 and also has a microstrip transmission line 7b having a wavelength 3/4 time as long as a wavelength at the passing center frequency, electrically connected to both ends of the microstrip transmission line 7a. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
