| 摘要 |
PURPOSE: To provide a high frequency filter whose filter characteristic can easily be adjusted, and which attains downsizing and a broadband characteristic and to provide a filter system using the high frequency filter and an electronic device employing them. CONSTITUTION: The high frequency filter 1 is configured by forming a ground electrode 3 on one major side of a dielectric board 2 and forming two microstrip lines 4a, 5a whose one-side is connected to ground via a through-hole 6 on the other major side. The microstrip lines 4a, 5a configure microstrip line resonators 4, 5 with the common through-hole 6 and both are coupled through an inductive component of the through-hole 6. Since the microstrip line resonators 4, 5 are coupled through the inductive component of the through-hole 6, no component for the coupling is required so as to downsize the high frequency filter 1. Since the coupling coefficient can be made higher, the high frequency filter 1 with a broadband characteristic can be obtained.
|
