111results about How to "Small transmission loss" patented technology

A tetrafluoroethylene / hexafluoropropylene copolymer has improved moldability in melt extrusion molding, especially with significant reduction of defects in high-speed extrusion coating of an electrical wire. The tetrafluoroethylene / hexafluoropropylene copolymer is obtained by polymerization of at least tetrafluoroethylene and hexafluoropropylene selected from the group consisting of tetrafluoroethylene, hexafluoropropylene and a third monomer without mixing with the resin which has the melting point with the difference of 20 degree C. and more from the melting point of the tetrafluoroethylene / hexafluoropropylene copolymer; and has a complex viscosity of from 2.0×I03 to 10.0×I03 Pa*s and a storage modulus of from 0.1 to 3.5 Pa*s in melt viscoelasticity measurement under the condition of atmosphere temperature of 310 degree C. and angular frequency of 0.01 radian / second. The tetrafluoroethylene / hexafluoropropylene copolymer can be used in an electrical wire as a coating on a conductive core.

The invention provides a terahertz modulator adopting a graphene metal composite structure. The terahertz modulator consists of a substrate, a metal structure layer, an insulating dielectric layer, a graphene film layer and an electrode. The terahertz modulator applies voltage between the metal structure layer and the electrode to change the chemical potential of graphene, so as to modulate terahertz wave energy penetrating through a device; in addition, through the resonant interaction of the metal structure layer in a specific terahertz wave band, the modulation depth of the device in the resonant wave band is improved. According to the terahertz modulator, the high electron mobility property of the graphene and the resonant property of the metal structure are combined to obtain the terahertz modulator with high speed and large modulation depth, and the terahertz modulator can be widely applied to the fields of terahertz communication, terahertz detection, terahertz imaging and the like.

The invention discloses an air conditioner, which comprises a cabinet-type indoor unit. The front upper part of the cabinet-type indoor unit is provided with an air outlet, the lower two sides and the bottom of the cabinet-type indoor unit are provided with air inlets, the cabinet-type indoor unit is provided with a sliding panel for opening and closing the front of the air outlet, the sliding panel is driven by a mechanical transmission device to descend or ascend, and the driving mechanism is a worm rack transmission pair. Because of the adoption of a simple transmission mode, the air conditioner can reduce the transmission loss and lower the cost on the premise of ensuring stable and uniform transmission.

The invention discloses a thin film piezoelectric sonic sensor. The thin film piezoelectric sonic sensor comprises a substrate layer, a ground electrode layer and a piezoelectric layer which are arranged in a laminated mode, and one or more transducers are arranged on the side, away from the ground electrode layer, of the piezoelectric layer; and photonic crystals at least formed in the piezoelectric layer are correspondingly arranged on the two sides of the transducers, and the resonant frequency of the thin film piezoelectric sonic sensor is located in band gaps of the photonic crystals. According to the thin film piezoelectric sonic sensor, the photonic crystals are at least arranged on the piezoelectric layer, the mechanical vibration stability of the piezoelectric layer is improved, the sonic wave reflectivity is improved, the energy loss of sonic wave transmission is lowered, and the quality factor of the sensor is improved. The invention discloses a photonic crystal. The photonic crystal comprises a matrix and a scatterer formed on the matrix, the matrix is formed by at least two media layers in a laminated mode, and materials of any one of the media layers are different from those of other media layers. According to the photonic crystal, the sonic wave energy loss can be effectively reduced, and the quality factor of the sensor can be effectively improved when the photonic crystal is applied to the thin film piezoelectric sonic sensor.

The invention provides a sliding vane pump and a method using the sliding vane pump to convey fluid. The sliding vane pump is provided with a cylindrical pump casing, and the pump casing is internally provided with a driving shaft, a rotor sleeved on the driving shaft, and a sliding vane arranged on the rotor, wherein the sliding vane and an inner cavity of the pump casing are sealed in a contact manner; an end cover is arranged at the end part of the pump casing; the sliding vane pump further has a sliding vane pump suction port and a sliding vane pump discharge port; and the sliding vane pump suction port and / or the sliding vane pump discharge port are located on the end cover of the pump casing. The invention further provides a sliding vane pump, and the sliding vane pump includes a plurality of cylindrical pump casing, and has a sliding vane pump suction port and a sliding vane pump discharge port; the sliding vane pump suction port and / or the sliding vane pump discharge port are respectively located on the end cover; and fluid transfer openings penetrating the upper end surfaces and the lower end surfaces of partitions are arranged on the partitions. According to the method using the sliding vane pump, the fluid is sucked and / or discharged in the direction of the end part of the pump casing so as to pump.

An integrated DWDM receiver apparatus includes a support component and a silica-on-silicon substrate overlying the support component. The substrate includes a silica layer overlying a silicon layer and includes a first surface region and a second surface region. An optical demultiplexer is disposed within the silica layer under the first surface region and overlying the silicon layer. The optical demultiplexer includes a plurality of output waveguides and at least an input waveguide. The receiver apparatus includes one or more reflecting structures located in the silica layer under the second surface region. Each of the reflecting structures is optically coupled to a corresponding output waveguide. The receiver apparatus also includes one or more semiconductor photodetector array chips overlying the second surface region of the silica-on-silicon substrate. Each of the one or more photodetector array chips including one or more photodetectors which is optically coupled to a corresponding reflecting structure.

An integrated DWDM transmitter apparatus includes a support component and a silica-on-silicon substrate overlying the support component. The support component includes a temperature adjustment component. The silica-on-silicon substrate overlies the support component and includes a silica layer and a silicon layer. The silica-on-silicon substrate includes a corresponding a substrate surface which includes a first surface region and a second surface region. In an embodiment, the two surface regions are not coplanar. The transmitter apparatus includes an optical multiplexer within the silica layer, the optical multiplexer including a plurality of input waveguides and at least an output waveguide. The transmitter apparatus also includes one or more semiconductor laser array chips overlying the first surface region of the silica-on-silicon substrate. Each of the laser array chips including two or more lasers, which are optically coupled to corresponding ones of the plurality of input waveguides.

A trench optical fiber that stably realizes a small transmission loss includes (1) a core extending in an axial direction while containing an axial center of the fiber, the core having a diameter d1 of 7.0 μm to 7.4 μm; (2) a first optical cladding layer surrounding the core and having an outside diameter d2 of 1.67d1 to 2.5d1; (3) a second optical cladding layer surrounding the first optical cladding layer; and (4) a jacket layer surrounding the second optical cladding layer and containing fluorine having a concentration of 0.06 wt % or higher. A relative refractive index difference Δ1 of the core with respect to the jacket layer is 0.31% to 0.37%. A relative refractive index difference Δ2 of the first optical cladding layer with respect to the jacket layer is +0.02% or larger and smaller than Δ1. A relative refractive index difference Δ3 of the second optical cladding layer with respect to the jacket layer is −0.2% or smaller.