| 摘要 |
The invention provides a high frequency filter (1) which can facilitate filter-characteristic adjustments and miniaturization and can obtain an excellent broadband characteristic. In addition, the invention provides a filter device using the high frequency filter, and an electronic apparatus incorporating the same. In this filter (1), a ground electrode (3) is arranged on one of the main surfaces of a dielectric substrate (2). On the other main surface thereof there are arranged two or more microstrip lines (4a, 5a), and one end of each microstrip line (4a, 5a) is grounded via a through-hole (6) to form a high frequency filter. The microstrip lines (4a, 5a) and the shared through-hole (6) constitute microstrip line resonators (4, 5), which are coupled via the inductance of the through-hole (6). With this arrangement, there is no need for an additional coupling element. Thus, the size of the high frequency filter (1) can be reduced. Furthermore, since a large coupling coefficient can be obtained, the high frequency filter (1) can have a broadband characteristic. <IMAGE> |
