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    • 4. 发明授权
    • 종(縱)결합 공진기형 탄성 표면파 필터
    • 종(纵)결합공진기형탄성표면파필터
    • KR100415280B1
    • 2004-01-16
    • KR1020010036553
    • 2001-06-26
    • 가부시키가이샤 무라타 세이사쿠쇼
    • 다카미네유이치
    • H03H9/64
    • H03H9/6436H03H9/14582H03H9/14588
    • In a longitudinally coupled resonator type surface acoustic wave filter (1) including respective narrow pitch electrode finger portions (N1-N4) provided at the end portions of neighboring IDT's (each of which contains a narrow pitch electrode finger portion in which the electrode fingers have a narrower pitch than the remaining electrode fingers), the inter-center distance (X1-X6) between the centers of at least one pair of adjacent electrode fingers is deviated from 0.25»A + 0.25»B, in which »A represents the wavelength determined by the pitch of one of the electrode fingers, and »B represents the wavelength determined by the pitch of the other electrode finger.
    • 在纵向耦合谐振器型表面声波滤波器(1)中,其包括设置在相邻IDT的端部的各自的窄间距电极指状部(N1-N4)(其中每个都包含其中电极指具有窄间距电极指部 比其余电极指更窄的间距),至少一对相邻电极指的中心之间的中心间距离(X1-X6)偏离0.25“A + 0.25”,其中“A” 表示由电极指之一的间距确定的波长,并且“B”表示由另一电极指的间距确定的波长。
    • 5. 发明公开
    • 탄성 표면파 필터 장치
    • 表面声波滤波器
    • KR1020020075306A
    • 2002-10-04
    • KR1020020015842
    • 2002-03-23
    • 가부시키가이샤 무라타 세이사쿠쇼
    • 사와다요이치다카미네유이치
    • H03H9/64
    • H03H9/6436H03H9/0071H03H9/0085H03H9/14582
    • PURPOSE: To provide a surface acoustic wave filter that has a balanced- unbalanced conversion function, whose input impedance differs from its output impedance and that is excellently in-band balanced. CONSTITUTION: This invention provides the surface acoustic wave filter 100 where a center interval between input and output interdigital transducers(IDTs) of a 2nd surface acoustic wave filter element 102 is selected greater than that of a 1st surface acoustic wave filter element 101 by about 0.5 wavelength of a surface acoustic wave so as to attain phase inversion between outputs of the surface acoustic wave filter elements 101, 102 and the balanced-unbalanced conversion function is provided, and the total sum of static capacitances of a plurality of the IDTs of the 2nd surface acoustic wave filter element 102 is selected greater than the total sum of static capacitances of a plurality of the IDTs of the 1st surface acoustic wave filter element 101.
    • 目的:提供具有平衡不平衡转换功能的表面声波滤波器,其输入阻抗与其输出阻抗不同,并且具有卓越的带内平衡。 构成:本发明提供了表面声波滤波器100,其中选择第二表面声波滤波器元件102的输入和输出叉指式换能器(IDT)之间的中心间隔大于第一表面声波滤波器元件101的中心间隔大约为0.5 提供表面声波的波长以获得表面声波滤波器元件101,102的输出和平衡不平衡转换功能的输出之间的相位反转,并且提供第二个的多个IDT的静态电容的总和 选择表面声波滤波器元件102大于第一表面声波滤波器元件101的多个IDT的静态电容的总和。
    • 6. 发明公开
    • 탄성 표면파 장치 및 통신 장치
    • 表面声波设备和通信设备
    • KR1020020070868A
    • 2002-09-11
    • KR1020020010875
    • 2002-02-28
    • 가부시키가이샤 무라타 세이사쿠쇼
    • 다카미네유이치
    • H03H9/64
    • H03H9/0042H03H9/0061H03H9/02874H03H9/02913H03H9/02921H03H9/02992H03H9/14582H03H9/14591H03H9/6489
    • PURPOSE: Surface acoustic wave device and communication device are provided, which has a filter characteristic, especially, a balance-unbalance conversion function, and a communications device including such a novel surface acoustic wave device. CONSTITUTION: The surface acoustic wave device according to the first preferred embodiment of the present device includes a longitudinally-coupled resonator type surface acoustic wave unit(1), and IDTs 2 and 3 as a surface acoustic wave resonator connected in series with the surface acoustic wave unit(1) which are provided on a piezoelectric substrate(20) made of, for example, 40 +/- 5 DEG Y cut X propagation LiTaO3. The piezoelectric substrate(20) is made of other suitable materials. The longitudinally-coupled resonator type surface acoustic wave unit 1 and the IDTs 2 and 3 are preferably made of aluminum(Al) electrodes(foils) which are formed by photolithography or other suitable process.
    • 目的:提供具有滤波器特性,特别是平衡不平衡转换功能的表面声波装置和通信装置,以及包括这种新型表面声波装置的通信装置。 构成:本装置的第一实施方式的声表面波装置包括纵向耦合的谐振器型声表面波单元(1),作为表面声波谐振器的IDT2和3与表面声波 波形单元(1),其设置在由例如40 +/- 5°Y切割的X传播LiTaO 3制成的压电基板(20)上。 压电基片(20)由其他合适的材料制成。 纵向耦合的谐振器型声表面波单元1和IDT2和3优选地由通过光刻或其它合适的工艺形成的铝(Al)电极(箔)制成。