| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact high frequency device which controls the occurrence of eddy current and parasitic capacitance, and has excellent high frequency characteristics. SOLUTION: A bandpass filter BPF is provided in a dielectric layer 13 on a board 11 that has an opening 14. The BPF has composed of a couple of a first inductive element L1 and a first capacitive element C1, a couple of a second inductive element L2 and a second capacitive element C2, and a couple of a third inductive element L3 and a third capacitive element C3. The opening 14 is provided at a position opposing to the first inductive element L1. The occurrence of parasitic capacity and eddy current is controlled directly under the first inductive element L1 by providing the opening 14 on the board 11, so that signal loss is reduced and the characteristics of the filter circuit are improved. COPYRIGHT: (C)2011,JPO&INPIT |
