Title:
LADDER FILTER
Document Type and Number:
Japanese Patent JP3147793
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain the ladder filter in which disturbance in the filter characteristic is less.
SOLUTION: The ladder filter 10 includes a support board 12 made of an insulation material. Support members 22, 24, 26, 28, 30, 32, 34, 36 are fitted to a land formed to pattern electrodes 14, 16, 18, 20 on the support board 12. Piezoelectric resonators 50a, 50b, 50c, 50d are fitted on the support members 22-36 to form the filter connected to be a ladder. The piezoelectric resonators 50a, 50b, 50c, 50d have a board laminating the piezoelectric layer and the electrodes and the electrode s are connected to external electrodes 62, 64 formed to one side face of the board. Let a width of the piezoelectric resonators 50a, 50b, 50c, 50d, be (w) and its thickness be (t) and number of laminators be (n), then a relation of 1≤log10(n2wt)≤3 is established.
Inventors:
Jiro Inoue
Unami Toshihiko
Tetsuo Takeshima
Unami Toshihiko
Tetsuo Takeshima
Application Number:
JP32770896A
Publication Date:
March 19, 2001
Filing Date:
November 22, 1996
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H03H9/17; H01L41/083; H03H9/10; H03H9/125; H03H9/15; H03H9/205; H03H9/54; H03H9/58; H03H9/60; H03H; (IPC1-7): H03H9/58
Domestic Patent References:
JP6053315A | ||||
JP6030208A | ||||
JP5669999A | ||||
JP88677A | ||||
JP8172227A | ||||
JP6132578A | ||||
JP535607B2 | ||||
JP6261170B2 | ||||
JP4831368B1 | ||||
JP323705Y2 |
Attorney, Agent or Firm:
Michihiro Okada