Title:
GROUP DELAY TIME COMPENSATION TYPE BAND-PASS FILTER
Document Type and Number:
Japanese Patent JP3049227
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide the band-filter which compensates delay time characteristics and reduces the amplitude deviation and delay time deviation in the passing band.
SOLUTION: First to Nth (N≥6) capacitive resonators 10a to 10h are cascaded in a U shape and a magnetic coupling circuit performs main coupling among the respective capacitive resonators. In this case, when (n)th (n<N) and (n+1)th capacitive resonators are positioned at the folding-back point of the U shape, subordinate coupling between the (n-1)th capacitive resonator 10c and (n+2)th capacitive resonator 10 is done by a capacitor element or S-shaped coupling loop and subordinate coupling between the (n-$2)th capacitive resonator 10b and (n+3)th capacitive resonator 10g is done by a capacitor element or S-shaped coupling loop.
Inventors:
Hiroshi Hatanaka
Application Number:
JP5654798A
Publication Date:
June 05, 2000
Filing Date:
March 09, 1998
Export Citation:
Assignee:
Nippon Denko Co., Ltd.
International Classes:
H01P1/20; H01P1/205; H01P7/00; H01P7/04; (IPC1-7): H01P1/20; H01P1/205; H01P7/00
Domestic Patent References:
| JP5989002A | ||||
| JP8222915A | ||||
| JP5178673A | ||||
| JP10173406A |
Other References:
【文献】英国特許出願公開1304970(GB,A)
Attorney, Agent or Firm:
Satoru Akita (1 person outside)