Title:
TRANSMISSION BAND DIVISION-TYPE BRANCHING FILTER
Document Type and Number:
Japanese Patent JP3673112
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To miniaturize a filter and to improve performance by providing a transmission filter having a first transmission filter circuit and a second transmission filter circuit, whose pass bands differ, a reception filter, a frequency characteristic improving element and a matching circuit where one long line is arranged.
SOLUTION: A (λ/4) long line is adopted to a first matching circuit 106 which is connected to a first transmission filter circuit 107 in series and a (λ/2) long line to a second matching circuit 108 which is connected to a second transmission filter circuit 109 in series. Thus, a high performance branching filter is obtained. In order to maintain the characteristic of the pass band of the first transmission filter circuit 107, the (λ/2) long line is adopted to the second matching circuit 108. Frequency characteristic improving impedances ZA 113 and ZANT 114 are elements required for adjusting a voltage sanding wave ratio (VSWR).
Inventors:
Satoshi Terada
Kazushige Noguchi
Yoshiaki Fujita
Komazaki Tomokazu
Kazushige Noguchi
Yoshiaki Fujita
Komazaki Tomokazu
Application Number:
JP9840699A
Publication Date:
July 20, 2005
Filing Date:
April 06, 1999
Export Citation:
Assignee:
Oki Electric Industry Co., Ltd.
International Classes:
H01P1/213; H03H7/38; H03H7/46; H03H9/145; H03H9/72; (IPC1-7): H01P1/213; H03H7/38; H03H7/46; H03H9/145; H03H9/72
Domestic Patent References:
| JP1041704A | ||||
| JP61230502A | ||||
| JP10322105A | ||||
| JP98584A |
Attorney, Agent or Firm:
Kenji Onishi
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