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Title:
MICROWAVE BRANCHING FILTER
Document Type and Number:
Japanese Patent JPH04302504
Kind Code:
A
Abstract:

PURPOSE: To improve the input return-loss characteristic and to effectively utilize the whole passing band by providing adjusting screws for adjusting the impedance of a branch part.

CONSTITUTION: The adjusting screws 7 are provided on the thickness-directional flank of a box body 1 as an external conductor which forms a cavity in a rectangular prism shape inside and at positions corresponding to coaxial connectors 4 for output and positions at a λ/8 (λ: wavelength) distance from said positions so that they can enter and exit from the cavity on the other flank side of an internal conductor 2; and the quantities of insertion of the adjusting screws 7 into nearby the branch part are adjusted to adjust the impedance of the branch part. Then unnecessary reactance present at the branch part is approximate to zero and the equivalent characteristic impedance of a line branching to a filter side is approximated to the characteristic impedance of a line branching to an adjacent channel. Constant effect can be obtained even when adjusting screws 7 are provided only at the positions corresponding to the coaxial connectors 4.


Inventors:
JINNAI TAKEHISA
Application Number:
JP1991000091734
Publication Date:
October 26, 1992
Filing Date:
March 29, 1991
Export Citation:
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Assignee:
NEC CORP
International Classes:
H01P1/213; H01P5/02; H01P5/04; H01P5/12; (IPC1-7): H01P1/213; H01P5/02; H01P5/12
Domestic Patent References:
JPS6430906U1989-02-27



 
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