TWO-FREQUENCY BAND PASS FILTER

PURPOSE: To improve the VSWR of a pass band, to enhance a pass band loss characteristic, to make the size of the filter small and to reduce the cost. CONSTITUTION: One terminal of a 1st band pass filter 1 (2nd band pass filter 2) is connected to a 1st branch terminal 3a (2nd branch terminal 3b) of a...

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Bibliographic Details
Main Author KOBAYASHI TOA
Format Patent
LanguageEnglish
Published 13.09.1996
Edition6
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRICITY
RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
WAVEGUIDES
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Summary:PURPOSE: To improve the VSWR of a pass band, to enhance a pass band loss characteristic, to make the size of the filter small and to reduce the cost. CONSTITUTION: One terminal of a 1st band pass filter 1 (2nd band pass filter 2) is connected to a 1st branch terminal 3a (2nd branch terminal 3b) of a 1st T branch 3 via a branch line 5(6). The other terminal of the 1st band pass filter 1 (2nd band pass filter 2) is connected to a 1st branch terminal 4a (2nd branch terminal 4b) of a 2nd T branch 4 via a branch line 7(8). An electric angle of each of the branch lines 5, 7 from a center of the T branches 3, 4 to the 1st band pass filter 1 is selected to be an electric angle at which the center frequency of the 2nd band pass filter 2 is not passed. The electric angle of each of the branch lines 6, 8 from the center of the T branches 3, 4 to the 2nd band pass filter 2 is selected to be an electric angle at which the center frequency of the 1st band pass filter 1 is not passed.
Bibliography:Application Number: JP19950039676