11 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 a preparation method of a surface acoustic wave filter chip with a frequency adjustment structure, and the method comprises the following steps: S1, carrying out the spin coating of a layer of photoresist on one side surface of a substrate, and carrying out the photoetching operation for patterning; s2, evaporating a layer of titanium-aluminum electrode on one side surface of the patterned substrate, removing the photoresist, completing electrode patterning, and forming an interdigital metal region on one side surface of the substrate; and S3, sputtering silicon dioxide on one side surface of the substrate in a magnetron sputtering manner, so that the substrate between the interdigital metal regions is filled with the silicon dioxide filling layer, and a silicon dioxide protection layer is formed on the interdigital metal regions and the silicon dioxide filling layer. According to the surface acoustic wave filter, the combination mode of the interdigital metal area and the silicon dioxide material is ingeniously designed, complex trim operation is avoided, the frequency characteristic of the surface acoustic wave filter is effectively improved, meanwhile, the structural stability and the production efficiency of the device are guaranteed, and the production cost is reduced.

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 invention discloses a surface acoustic wave filter and a preparation method thereof, and belongs to the field of filter devices, the TCF can be effectively regulated and controlled by doping fluorine contents with different proportions into SiO2 of a temperature compensation layer, and accurate signal transmission and receiving, frequency stability improvement, signal bit error rate reduction and communication quality improvement of the filter in the use process are ensured.

The invention discloses a semiconductor structure for improving the power capacity of a surface acoustic wave filter, and the structure comprises a first resonator and a first wire PAD which are disposed in a first region, and the first resonator is electrically connected with the first wire PAD; the second resonator and the second wire PAD are arranged in the second area, and the second resonator is electrically connected with the second wire PAD; the third resonator and the third wire PAD are arranged in the third area, and the third resonator is electrically connected with the third wire PAD; the heat conduction channel covers the electrical isolation area, at least part of the first wire PAD, at least part of the second wire PAD and at least part of the third wire PAD are covered by the heat conduction channel, and the heat conduction channel is made of an insulating medium material. The heat of the high-temperature resonator can be timely transmitted to the low-temperature resonator or the PAD area through the heat conduction channel, so that the high-temperature resonator is prevented from being burnt, and the power capacity is improved.

The present invention discloses a surface acoustic wave filter and its fabrication method. The surface acoustic wave filter comprises a substrate, two first interdigital electrodes, a plurality of second interdigital electrodes, an input transducer, and an output transducer. The two first interdigital electrodes are symmetrically arranged on the substrate, each having a first lead portion at its center. The substrate is provided with a deep hole shaped to match the bottom end of the first lead portion, and a metal coating is provided between the first lead portion and the deep hole. The surface acoustic wave filter designed in the present invention has high antistatic properties and can be fabricated through processes such as evaporation, etching, and metal filling, reducing manufacturing costs.

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 invention relates to a surface acoustic wave filter chip with a frequency adjustment structure and a preparation method thereof, the surface acoustic wave filter chip with the frequency adjustment structure comprises a substrate, one side surface of the substrate is provided with interdigital metal areas, and the substrate between the interdigital metal areas is provided with a silicon dioxide filling layer. The invention aims to provide a novel frequency boosting structure, by ingeniously designing a combination mode of an interdigital metal region and a silicon dioxide material, not only is complex trim operation avoided, but also the frequency characteristic of a surface acoustic wave filter is effectively improved, meanwhile, the structural stability and the production efficiency of a device are ensured, the production cost is reduced, and the product quality is improved. And a new technical path is provided for research and development of a high-performance filter.

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.

The present invention discloses a method and system for adjusting the resonance frequency. The surface acoustic wave filtering device and method with temperature compensation include: the temperature-sensitive layer of the surface acoustic wave filtering device performs temperature sensing and signal acquisition; the signal preprocessing circuit amplifies and filters the acquired signal and inputs it into the temperature-frequency algorithm chip; the algorithm model based on neural network inside the temperature-frequency algorithm chip calculates the required compensation parameters; the compensation parameters are output to the variable capacitor to adjust the resonance frequency of the surface acoustic wave filtering device; through dynamically adjusting the resonance frequency of the surface acoustic wave filtering device, a closed-loop control of temperature compensation is achieved; the present application realizes the temperature compensation control of the surface acoustic wave filtering device, ensuring that the surface acoustic wave filter can maintain a stable resonance frequency in different temperature environments.