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公开(公告)号：EP0196063A3
公开(公告)日：1987-12-23
申请号：EP86104081
申请日：1986-03-25
IPC分类号： H03H09/25 , H03H09/145 , H03H09/64
CPC分类号： H03H9/6479 , H03H9/1455 , H03H9/25 , H03H9/6463
摘要： in order to realize an SAW filter withstanding high power, a plurality of single open-ended surface acoustic wave resonators (22-25) are connected in series, and an earth conductor (10) is disposed at least on a part of rear face of a piezoelectric substrate (8) constituting the surface acoustic wave resonators. And static capacities (26-31) formed between said earth conductor and electrode conductors on the piezoelectric substrate constituting the surface acoustic wave resonators are utilized as constituents of the filter circuit. In the above described structure, a part of input power is not converted into acoustic energy, but directly transmitted to the output side. Since the mechanical stress imposed upon the electrode material and the piezoelectric substrate is thus lightened, the SAW filter can withstand a large power signal.
摘要翻译： 为了实现能够承受高功率的SAW滤波器，多个单端开口型声表面波谐振器（22-25）串联连接，接地导体（10）至少部分地设置在背面的一部分上 一个构成表面声波谐振器的压电基片（8）。 并且，构成声表面波谐振器的压电基片上的所述接地导体和电极导体之间形成的静态电容（26-31）被用作滤波电路的组成部分。 在上述结构中，一部分输入功率不被转换成声能，而是直接传输到输出侧。 由于施加在电极材料和压电基片上的机械应力因此减轻，所以SAW滤波器可以承受大功率信号。
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公开(公告)号：EP0176786A3
公开(公告)日：1986-04-16
申请号：EP85111041
申请日：1985-09-02
发明人： Ebneter, Josef
IPC分类号： H03H09/145 , H03H09/64
CPC分类号： H03H9/1452 , H03H9/02755 , H03H9/02944 , H03H9/14505 , H03H9/1455 , H03H9/6426
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公开(公告)号：EP0100503A3
公开(公告)日：1986-02-26
申请号：EP83107258
申请日：1983-07-23
发明人： Nakazawa, Yuzo Toyo Comm. Equipment Co. Ltd. , Ono, Kazuo Toyo Communication Equipment Co. Ltd. , Tanaka, Masaki Toyo Comm. Equipment Co. Ltd. , Morita, Takao Toyo Comm. Equipment Co. Ltd. , Kurosaki, Takefumi Toyo Comm. Equipment Co. Ltd.
IPC分类号： H03H09/64 , H03H09/145
CPC分类号： H03H9/6433 , H03H9/02944 , H03H9/6463
摘要： A high frequency narrow-band pass multi-mode filter in constructed in such manner that SAW of SSBW resonators are closely disposed to each other on a single piezo-electric substrate to generate different vibration modes of different resonance frequencies, conditions that the resonators are acoustically coupled to each other to cause these vibration modes, are experimentally found, and the above conditions are satisfied by the filter. In order to reduce the ohmic loss of a very narrow common bus bar, the number of strip pairs of electrode in both interdigital transducers (hereinafter referred to as IDT) is minimized and instead reflectors are provided on the both sides of said TDTs to compensate for the reduction of its Q value. A part of the bus bar for the IDT electrodes is formed integral with some or all of gratings of the reflectors, whereby the connecting positions of the grating electrodes with respect to lead terminals can be positioned with a high freedom.
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公开(公告)号：EP0103932A3
公开(公告)日：1985-11-06
申请号：EP83201333
申请日：1983-10-05
发明人： Schofield, John
CPC分类号： H03H9/02905 , H03H9/02708 , H03H9/02795 , H03H9/02842 , H03H9/1452 , H03H9/14547 , H03H9/14552 , H03H9/14573
摘要： In an acoustic surface wave device employing an input and an output transducer (2, 3) and a multistrip coupler (5), the input and output tracks (11, 12) may have to be well separated to avoid unwanted acoustic energy transfer. As a result, a significant loss can occur from the launching of acoustic energy from the interconnecting conductors of the msc. In the improved device, the interconnecting conductors (22, 32') are given a spacing which is different from the, or the equivalent, wide-aperture beam spacing of conductors (16,17; 36', 37') in either track of the msc, and which must not be such as to launch any acoustic surface or bulk waves within the frequency passband. In a forward transfer msc different spacings can alternate, and in a reflective msc the spacing can take the mean of the respective equivalent wide-aperture-beam spacings of the coupler electrodes. When a reflective msc is used there is a risk of acoustic reflection from one track to the other causing spurious response effects, especially when single guided mode transducers are employed. This is overcome by inclining the connecting strips (32') to the perpendicular to the propagation direction.
摘要翻译： 在采用输入和输出换能器（2,3）和多带耦合器（5）的声表面波器件中，输入和输出轨迹（11,12）必须很好地分开以避免不需要的声能转移。 因此，从msc的互连导体发射声能会发生显着的损失。 在改进的装置中，互连导体（22,32'）的间距与导体（16,17; 36'，37'）的任一轨道或等效宽孔径光束间距不同 msc，并且不得在频率通带内发射任何声表面或体波。 在正向传输msc中，不同的间隔可以交替，并且在反射msc中，间隔可以取各个耦合器电极的等效宽孔径束间距的平均值。 当使用反射型msc时，存在从一个轨道到另一个轨道发生声反射的风险，从而导致寄生响应效应，尤其是当使用单导模转换器时。 这通过将连接条（32'）倾斜到垂直于传播方向来克服。
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公开(公告)号：EP0098116A3
公开(公告)日：1985-10-09
申请号：EP83303644
申请日：1983-06-24
申请人： FUJITSU LIMITED
发明人： Tanji, Shigeo , Wakatsuki, Noboru
IPC分类号： H03H09/64
CPC分类号： H03H9/02771 , H03H9/643
摘要： A surface acoustic wave device comprises a first set of interdigitated electrodes (14) that generates surface acoustic waves, a second set of intergiditated electrodes (18) that receives and converts surface acoustic waves into electrical signals, and an intermediate electromechanical coupling element (30). The coupling element comprises a plurality of parallel strips (32) formed on the surface of a piezoelectrical substrate such as to receive and change the direction of propagation of the surface acoustic waves, the parallel strips being spaced at a predetermined distance from each other and being selectively interconnected or left unconnected to obtain suitable stopband characteristics. In one arrangement (Figure 3) alternate pairs of adjacent strips of the coupling element are connected to a common connecting strip (31). In another arrangement (Figure 10) alternate strips of the coupling element are connected to a common connecting strip (41).
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公开(公告)号：EP0034851A3
公开(公告)日：1981-10-21
申请号：EP81200147
申请日：1981-02-06
IPC分类号： H03H09/64
CPC分类号： H03H9/643
摘要： A surface acoustic wave bandpass electrical filter consists of input and output interdigital transducers (IP, OP) with an interposed track changing multistrip array (MSA). A conventional broadband array (MSA) is divided into two sub-groups of strips with respect to a centre of symmetry (C) separated by different distances along the input track (T1) and the output track (T2) such that the amplitude-frequency response of the array (MSA) has a stopband centred on a predetermined frequency. If the input and output transducers (IP, OP) both have a double electrode configuration, electrode separation λo/4, providing a fundamental passband at a corresponding frequency fo and an equal amplitude passband at the third harmonic 3fo, then a separation difference of λo/6 between the sub-groups of the array (MSA) in the two tracks (T1, T2) can suppress the third harmonic passband in the filter output. The multistrip coupler may instead be divided into three sub-groups (Figure 5). The sub-groups of the multistrip array may be further sub-divided to suppress more than one frequency (Figure 7). Also a multistrip array arranged in groups to provide a shaped bandpass response may have each group divided into sub-groups to suppress a selected harmonic passband of the array (FigureS).
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公开(公告)号：EP0031685A3
公开(公告)日：1981-10-07
申请号：EP80304604
申请日：1980-12-18
申请人： FUJITSU LIMITED
发明人： Iwamoto, Hisao , Wakatsuki, Noboru
IPC分类号： H03H09/145 , H03H09/64
CPC分类号： H03H9/02771 , H03H9/02842 , H03H9/02866 , H03H9/14547 , H03H9/14573
摘要： A surface acoustic wave device comprises a piezoelectric substrate, and an input transducer and an output transducer formed on the substrate. Dummy transducers are formed on the substrate and arranged to extend from the ends of the input and output transducers toward the ends of the substrate. The dummy transducers individually include electrodes spaced at the same pitch as the electrode pitch in the input and output transducers. Accordingly, there is no occurrence of reflections of the surface acoustic wave at the ends of the input and output transducers.
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公开(公告)号：EP0219182A3
公开(公告)日：1988-02-24
申请号：EP86303328
申请日：1986-05-01
申请人： SPERRY CORPORATION
发明人： Fredricksen, Hans
IPC分类号： H03H09/64
CPC分类号： H03H9/02685 , H03H9/6433 , H03H9/6453 , H03H9/6496
摘要： A surface acoustical wave (SAW) filter is provided by placing at least one pair resonator channels consisting of reflectors (44, 48, 50, 54) and input and output transducers (56, 70) on the surface of a suitable substrate, such as a piezo-electric crystal. One channel of the pair consists of an input transducer (56) and an output transducer (70) which are aligned in a path along which the SAW progresses. The two channels are identical except that the separation distance between the transducers and the reflectors, in one channel is slightly different than the corresponding distance in the other channel. This separation difference serves to broaden the passband for applications which require a broader passband than is obtainable with a single channel resonator filter. Differential detection of the SAW in one section with respect to the other channel is achieved by using a symetrically inverted output transducer, in one embodiment. In another embodiment an offset transducer is used to accomplish the differential sensing.
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公开(公告)号：EP0196770A3
公开(公告)日：1987-12-09
申请号：EP86301334
申请日：1986-02-25
发明人： Nagai, Kiyoshi Oki Electric Industry Co., Ltd. , Sakamoto, Nobuyoshi Oki Electric Ind. Co., Ltd.
IPC分类号： H03H09/145 , H03H09/64
CPC分类号： H03H9/6426 , H03H9/1455
摘要： A surface-acoustic-wave filter of the multi-transducer type includes a plurality of input transducers (2) and a plurality of output transducers (3). These input and output transducers (2, 3) are alternately and parallelly disposed on a piezo-electric substrate (1) spaced apart by centre to centre distances ℓ1 to ℓn. Taking any one centre to centre distance as a reference distance ℓ1, the respective centre to centre distances ℓ1 through 4n are arranged to satisfy the following relationships:- where m1 is an arbitrary positive real number, m2 through mn are respectively arbitrary integers (0, ± 1, ± 2, ...), and λ is the wavelength of the surface-acoustic-wave. The surface-acoustic-wave filter provides a good filter characteristic having sufficient effective attenuation in the attenuation region without degrading the filter characteristics in the pass-band thereof.
摘要翻译： 多换能器类型的表面声波滤波器包括多个输入换能器（2）和多个输出换能器（3）。 这些输入和输出换能器（2,3）交替且平行地设置在以中心到中心距离l1到ln隔开的压电基板（1）上。 以任意一个中心距作为参考距离l1，相应的中心距离l1至4n被布置为满足以下关系：其中m1是任意正实数，m2至mn分别是任意整数（0， ±1，±2，...），λ是表面声波的波长。 表面声波滤波器提供了良好的滤波器特性，在衰减区域中具有足够的有效衰减而不降低其通带中的滤波器特性。
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公开(公告)号：EP0169607A3
公开(公告)日：1987-04-01
申请号：EP85201135
申请日：1985-07-09
发明人： Schofield, John
IPC分类号： H03H09/64 , H03H09/145
CPC分类号： H03H9/02637 , H03H9/02708 , H03H9/14552
摘要： An improvement to the reflective multistrip coupler of the surface acoustic wave device described in EPA No. 0098661 for overcoming the k-determined bandwidth limitation wherein, instead of being uniform, the electrode spacing is varied correspondingly along the input and output arrays of the coupler with the result that different frequency bands will be reflected by different groups of electrodes, and at least two reflective couplers (24, 25) with complementary spacing variations are included in the path coupling the input and output transducers (2, 3) so that all frequencies in the overall passband have substantially the same overall time delay. Contiguous bands of frequencies F,, f 2 , f 3 , f 4 , may be reflected by individual related groups 26, 27, 28, 29, of uniformly spaced electrodes forming either a monotonic or a permutated sequence, or the spacing can be varied continuously and monotonically.
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