Filter component and communication apparatus

PURPOSE: A filter assembly and a communication apparatus are provided to achieve optimum filter characteristics without changing a number of resonators regardless of switching control, thereby achieving optimum filter characteristics. CONSTITUTION: A filter assembly comprises the first filter, the s...

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Bibliographic Details
Main Authors ATOKAWA MASAYUKI, MIYAMOTO HIROFUMI
Format Patent
LanguageEnglish
Korean
Published 12.12.2002
Edition7
Subjects
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Summary:PURPOSE: A filter assembly and a communication apparatus are provided to achieve optimum filter characteristics without changing a number of resonators regardless of switching control, thereby achieving optimum filter characteristics. CONSTITUTION: A filter assembly comprises the first filter, the second filter, first and second input/output terminals electrically connected to first and second input/output ends of the first filter, respectively, and third and fourth input/output terminals electrically connected to first and second input/output ends of the second filter, respectively, wherein the filter assembly is externally connected to a change-over switch(4) for switching between the first state where the first input/output terminal connected to the first filter is electrically connected to the third input/output terminal connected to the second filter so that the first filter and the second filter are combined into a single filter, and the second state where the first input/output terminal connected to the first filter is electrically isolated from the third input/output terminal connected to the second filter so that the first filter and the second filter operate as two discrete filters. 본 발명은 전환 스위칭 수단에 의해 전환제어하여도, 필터의 공진기의 단 수가 변화하지 않고, 항상 최적인 필터 특성을 얻을 수 있는 필터 부품 및 통신기 장치를 제공한다. 필터 부품(11)은 송신 필터(2), 수신 필터(3), 전환 스위치(4), 및 위상 회로(5a, 5b)를 가지고 있다. 송신 필터(2)의 양 단은 각각 안테나용 단자(ANT1) 및 송신용 단자(Tx)에 전기적으로 접속되어 있다. 수신 필터(3)의 한 단은 전환 스위치(4)를 개재하여 안테나용 단자(ANT2)에 전기적으로 접속되고, 수신 필터(3)의 다른 한 단은 수신용 단자(Rx)에 전기적으로 접속되어 있다. 메인 안테나(8)는 안테나용 단자(ANT1)에 접속됨과 동시에, 다이버시티 안테나(9)는 안테나용 단자(ANT2)에 접속되어 있다. 그리고, 전환 스위치(4)의 전환제어에 의해 수신 필터(3)를 안테나용 단자(ANT1) 및 안테나용 단자(ANT2) 중 어느 하나에 접속시킨다.
Bibliography:Application Number: KR20020031089