Title:
HIGH FREQUENCY FILTER CONTROL METHOD, HIGH FREQUENCY FILTER MANUFACTURING METHOD, AND HIGH FREQUENCY FILTER
Document Type and Number:
Japanese Patent JP2004289755
Kind Code:
A
Abstract:
To provide a miniaturized low-loss high frequency filter including desired out-of-pass-frequency-band filtering characteristics or suppression characteristics excellent for a desired frequency, a high-performance communication device and a measuring instrument at low cost.
In a band pass filter configured by electromagnetic-field-coupling a plurality of 1/2 wavelength line resonators and a port via a parallel coupling line 15, a length L of the parallel coupling line 15 is changed from a 1/4 wavelength to deviate a frequency in which the parallel coupling line 15 indicates a maximum coupling extent, from the central frequency of a filter pass frequency band, thereby realizing free filtering characteristics.
Inventors:
SAGAWA USHIO
TAKAHASHI KAZUAKI
TAKAHASHI KAZUAKI
Application Number:
JP2003082429A
Publication Date:
October 14, 2004
Filing Date:
March 25, 2003
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H01P1/203; H01P1/205; H01P1/212; H01P3/08; H01P11/00; (IPC1-7): H01P1/203; H01P1/205; H01P1/212; H01P3/08; H01P11/00
Attorney, Agent or Firm:
Fumio Iwahashi
Tomoyasu Sakaguchi
Hiroki Naito
Tomoyasu Sakaguchi
Hiroki Naito