442results about How to "Raise the resonant frequency" patented technology

The invention relates to a surface acoustic wave (Surface Acoustic Wave, SAW) device on the basis of a flexible substrate and a preparation method thereof. The SAW device comprises a substrate, a bottom electrode layer, a piezoelectric layer and a top electrode layer. A working area is formed by the bottom electrode layer, the piezoelectric layer and the top electrode layer. The SAW device is characterized in that the flexible substrate is arranged below the bottom electrode layer; and the flexible substrate is provided with an opening. The SAW device and the preparation method thereof have the characteristics that 1, due to the adoption of the flexible substrate, the obtained device is light, can be mounted on a curved surface, can be continuously produced in a roll-to-roll mode, and has simple manufacturing process and low cost; and 2, the flexible substrate is subjected to reverse side body deep etching to form the opening so that sound waves are spread in the piezoelectric layer in a plate wave mode, a high resonant frequency can be obtained, and meanwhile, the energy of the sound waves is limited in the working area so that a high device Q value can be obtained. Moreover, when a plate wave mode resonator is applied to a liquid sensor, the Q value cannot be reduced due to the radiation of the energy into the liquid.

In a dual-band antenna, an insulating base is formed on a support board having a ground conductor. A first radiation conductor plate for a low band has first and second divided conductor plates for covering an opening end of the insulating base. A feed conductor plate and a first short-circuiting conductor plate are continuously formed with the first divided conductor plates. A second short-circuiting conductor plate is continuously formed with the second divided conductor plate. A second radiation conductor plate for a high band is connected with the feed conductor plate. The feed conductor plate and the second short-circuiting conductor plate are electromagnetically coupled. The second divided conductor plate has a bending flap, and the bending flap is engaged with the insulating base. The bending flap has a cutout or cutaway portion for finely adjusting the resonant frequency.

An integrated semiconducting device comprises a semiconducting substrate, a plurality of grounding strips disposed above the substrate in a lower metal level of the semiconducting device, an inductor positioned in an upper metal level of the semiconducting device, and a plurality of conducting vias connected to and extending away from the grounding strips towards the inductor. The inductor, conducting via, ground strips structure forms a Faraday cage that acts as a shield against electromagnetic radiation. The number and placement of the conductive vias are adjustable and can be optimized based on the relative importance of maximizing the quality factor Q of the inductor or minimizing the capacitance between the inductor and ground.

A mirror driving device can include: a mirror part having a reflection surface configured to reflect light; mirror support parts formed at portions of the mirror part diagonal to each other; and a first actuator and a second actuator placed so as to surround the mirror part, wherein the first actuator and the second actuator each have a structure in which a plurality of first piezoelectric cantilevers with a longitudinal direction oriented to a direction of a first axis and a plurality of second piezoelectric cantilevers with a longitudinal direction oriented to a second axis are coupled together so as to be folded, and each of the first actuator and the second actuator has one end connected to the mirror part via a relevant one of the mirror support parts and another end connected to a fixing part near the mirror support part to which the one end is coupled.