5 results about "Surface filter" patented technology

The invention provides a surface acoustic wave structure, a surface acoustic wave filter and communication equipment, and is characterized in that the lengths of at least part of first interdigital electrodes are set to be sequentially increased in the surface acoustic wave propagation direction, the increasing amplitudes are sequentially reduced, and the lengths of second interdigital electrodes are set to be sequentially reduced in the surface acoustic wave propagation direction; and the reduction amplitude is sequentially reduced, so that the excitation intensity of the surface acoustic waves of the interdigital transducer in each region in the surface acoustic wave propagation direction is non-linearly changed, and the excitation intensity is weakened in the region where a part of first interdigital electrodes arranged at the rear part in the surface acoustic wave propagation direction are located. The weakening can improve the near-band suppression capability of the surface acoustic wave filter, so that the resonant frequency burr phenomenon caused by transverse sound waves can be reduced or suppressed, namely, the resonant frequency splitting phenomenon is not easily caused. In addition, the surface acoustic wave structure provided by the invention does not need to be additionally provided with a structure for inhibiting a transverse mode, and is simple in preparation process, low in preparation cost and small in occupied area.

The invention is suitable for the technical field of communication, and particularly relates to a wafer test method and system for a surface acoustic wave filter, and a storage medium. The wafer test method of the surface acoustic wave filter comprises the following steps: acquiring and analyzing a configuration file of the surface acoustic wave filter to be tested; establishing communication connection with at least one vector network analyzer through a communication bus according to the vector network analyzer resource list, and obtaining the number of physical ports corresponding to each vector network analyzer; performing port grouping according to the S parameter track list to obtain a first port grouping result; and obtaining the number of the to-be-tested device sites on the wafer of the to-be-tested surface acoustic wave filter, and performing port grouping again according to the first port grouping result and the number of the to-be-tested device sites. Compared with the prior art, automatic testing of the wafer of the surface acoustic wave filter is achieved, and the testing efficiency and accuracy are remarkably improved.

The invention relates to the technical field of SAW (Surface Acoustic Wave) device design, and particularly discloses an SAW (Surface Acoustic Wave) filter and a preparation method thereof. The IDT electrode is arranged on the surface of one side of the piezoelectric substrate and comprises a plurality of metal interdigital strips, a plurality of inner side false fingers, a plurality of outer side false fingers and a pair of bus bars, the metal interdigital strips are evenly distributed on the inner sides of the bus bars and form an interdigital structure, the inner side false fingers are located on the inner sides of the bus bars, and the ends of the inner side false fingers are opposite to the ends of the metal interdigital strips; the outer artificial finger is arranged on the outer side of the bus bar; each bus bar is arranged on the outer side of one bus bar and arranged opposite to the multiple outer side false finger end portions on the outer side of the bus bar, the distance between the outer side false finger end portions and the bus bars opposite to the outer side false finger end portions is smaller than the distance between the inner side false finger end portions and the finger bar end portions of the metal interdigital fingers opposite to the inner side false finger end portions, and therefore the ESD protection effect is improved.

The utility model relates to the technical field of dual-passband surface acoustic wave filters, in particular to a small-sized dual-passband surface acoustic wave filtering anti-interference enhancing structure, which comprises a dual-passband surface acoustic wave filter body, a substrate is arranged on the dual-passband surface acoustic wave filter body, an electromagnetic shielding net is arranged in the substrate, a shielding ring is arranged on the periphery of the top end of the substrate, and the shielding ring is arranged on the top end of the substrate. According to the structure, the electromagnetic shielding net is arranged in the substrate, and the shielding ring and the arched shielding cover are combined to form a multi-angle surrounding electromagnetic shielding system, so that external radiation interference can be effectively inhibited, external interference can be reflected, and the electromagnetic shielding effect is improved. And electromagnetic noise entering the filter from different directions can be reduced.

The utility model provides a kind of oil immersion device of acoustic surface filter, including rack, be equipped with soaking groove, cleaning tank and drying groove on the rack, be equipped with lid mechanism for respectively opening and closing the soaking groove, the cleaning tank and the drying groove on the rack;The opening outer edge of the soaking groove is equipped with pressing plate, first drive machine is equipped on the rack to drive the pressing plate away from or close to the soaking groove opening outer edge, the soaking groove is respectively connected with vacuum pump and oil storage container, heating mechanism is equipped on the oil storage container;The drying groove is connected with exhaust fan.Compared with prior art, the utility model has the advantages of simple structure, convenient operation, high working efficiency and high oil immersion success rate, can effectively improve detection efficiency, reduce the workload of artificial, ensure higher detection accuracy.