152results about How to "Low signal loss" patented technology

The invention discloses an enhanced radiation three-dimensional packaging structure and a packaging method for the same. The enhanced radiation three-dimensional packaging structure comprises a multilayer substrate, devices and an interconnection circuit for connecting the devices on the substrate, a micro-channel, a radiation plate, an external radiation device and a water pump. According to the enhanced radiation three-dimensional packaging structure and the packaging method for the same, a micro-fluid convection heat transfer mode is used for quickly conducting away the vast majority of heat produced by heating devices, and the three-dimensional interconnection circuit consisting of good metal conductors connected with the heating devices in the substrate is used for assisting the conduction of the heat into and out of the substrate in a metal heat conduction way; the radiation plate at the bottom of the substrate can be connected with various types of external radiation devices, so that the problem of thermally-induced failures of a multi-chip electronic product is effectively solved; process conditions are easy to implement, and the enhanced radiation three-dimensional packaging structure and the packaging method for the same are low in cost and convenient to machine in batches, and can be widely applied to a plurality of fields of aerospace, information communication, biochemistry, medicines, automatic control, consumer electronics and the like related to national electronic development and national security.

A class of modular, double-sided, edge-mounted printed circuit (PC) board modules and an associated modular network architecture for constructing stripline signal processing networks including high-power analog amplifiers and beam forming networks for driving multi-beam antenna systems. The stripline signal processing networks are characterized by network elements constructed from defined-length segments of transmission media configured to exhibit precisely determined phase and impedance characteristics. These circuits may also include conventional passive “lumped” electrical elements, such as resistors, capacitors and inductors; non-linear circuit elements such as diodes; and active electrical elements, such as amplifiers and transistors.

The embodiment of the invention discloses a WiFi transmission power value regulation method. The WiFi transmission power value regulation method comprises the following steps: acquiring signal transmission rates in transmitting data to WiFi hot spots; according to the preset mapping relationship between the signal transmission rates and WiFi transmission power values, acquiring an assembly of the WiFi transmission power values corresponding to the signal transmission rates; detecting signal quality parameters in transmitting data to the WiFi hot spots; selecting the minimal WiFi transmission power value in the assembly, which enables the signal quality parameters are larger than a threshold value, and according to the minimal WiFi transmission power value, transmitting data to the WiFi hot spot. The invention also discloses a WiFi transmission power value regulation device. By the adoption of the WiFi transmission power value regulation method and device, the power consumption of a terminal can be reduced.

The invention discloses a micro phase delay quantity light delay line array switch, on the same horizontal light path, in turn placing first single optical fiber polarization beam splitting collimator, first polarization rotating switch, first polarization distributor, first delay compensation plate, first polarization combiner, second polarization rotating switch, second polarization distributor, second polarization combiner, and second single optical fiber polarization beam splitting collimator, where the first micro reflector is placed on the vertical light path of the first polarization distributor, the second micro reflector is placed on the vertical light path of the first polarization combiner; the third micro reflector is placed on the vertical light path of the second polarization distributor, and the fourth micro reflector is placed on the vertical light path of the second polarization combiner; the second delay compensation plate is placed between the third and fourth micro reflectors and they together form the same horizontal light path. And it can implement 0-0.6ns delay, suitable to micro light delay control and regulation; and has advantages of small device bulk and low signal loss.

The invention relates to the technical field of machinery, and discloses a laser radar multipoint distance measurement system on the basis of diffraction optical components. The laser radar multipoint distance measurement system comprises a laser signal transmitting device, a laser signal receiving device and a signal processing system. The signal processing system is connected with the laser signal transmitting device and the laser signal receiving device, the laser signal transmitting device comprises a pulse laser device, and a collimation system, a beam expansion system, a diffraction grating and a half-transmitting and half-reflecting mirror are sequentially arranged in a light emitting direction of the pulse laser device; the light emitting direction of the pulse laser device is positioned in a transmitting direction of the half-transmitting and half-reflecting mirror, and the laser signal receiving device is arranged in a reflecting direction of the half-transmitting and half-reflecting mirror. The laser radar multipoint distance measurement system has the advantages that laser light transmitted by the pulse laser device can be divided into a plurality of light beams at equal angles or unequal angles by the diffraction grating, and the light beams can be transmitted via the half-transmitting and half-reflecting mirror, then face media at to-be-measured distances, can be reflected by the media at the to-be-measured distances and then can be reflected to the laser signal receiving device by the half-transmitting and half-reflecting mirror.

The invention discloses a zero-tolerance depth-controllable drilling method for a circuit board. The drilling method comprises a depth-controllable drilling process and a laser drilling process; in the depth-controllable drilling process, the drilling depth is 0-0.1 mm away from a target layer; and, in the laser drilling process, a medium layer on the surface of the target layer is removed, so that a zero-tolerance drilled hole is obtained. Because the mechanical depth-controllable drilling precision is 0.05 mm, the drilling depth is set to 0.05-0.1 mm away from the target layer when mechanical depth-controllable drilling is carried out; the problem that the distance between the mechanical drilling bottom and a next circuit layer is too small due to too-deep mechanical drilling or the next circuit layer of the target layer is drilled can be avoided; then, on the basis of mechanical depth-controllable drilling, laser drilling is carried out; after the medium layer on the surface of the target layer is removed; the hole depth achieves the target layer rightly; therefore, zero-tolerance depth-controllable drilling is realized; signal loss of micro-wave and radio-frequency products can be effectively reduced; the quality and the reliability of the circuit board are ensured; and requirements of clients on high-order products can be satisfied.

The invention provides a single-mode optical fiber bidirectional optical transceiver, which comprises a light emitting module, a light receiving module, a spot-size conversion structure and a wavelength division multiplexing module which is manufactured based on a silicon nitride technology, wherein the light emitting module is connected with an uplink optical signal transmitting end of the wavelength division multiplexing module, a downlink optical signal receiving end of the wavelength division multiplexing module is coupled and connected with the light receiving module by means of the spot-size conversion structure, an optical fiber connecting end of the wavelength division multiplexing module is connected with an optical line terminal by means of an optical fiber, the light receiving module, the wavelength division multiplexing module and the spot-size conversion structure are integrated on a same silicon substrate by adopting a silicon photonic technology, and the light emitting module is compounded and integrated on the silicon substrate. The single-mode optical fiber bidirectional optical transceiver can realize effective coupling between the wavelength division multiplexing module and the light receiving module, the light emitting module and the optical fiber, is uniform in waveguide size, can effectively reduce signal loss and reduce false reflection, and is insensitive to the ambient temperature.

The invention discloses a multi-fiber connector and a method for fixing the aramid fibers of the fibers connected thereto. The fixing method comprises the following steps: arranging more than one winding pinion in a shell of the fiber connector for winding the aramid fibers of the fibers; grouping the fibers connected to the fiber connector and weaving the stripped off aramid fibers of each fiber of the group of fibers into a strand; and tightly winding the strands of woven aramid fibers on near-by winding pinions. The fixing mode of the invention avoids the limitation of thickness of rubber bricks on the length of the fibers in the conventional adhesion mode, allows the fibers to run around the near-by pinions freely without being limited, and can effectively reduce the length of the shell and the curvature of the fibers and signal loss caused by the curvature, increase the tensile-resistance stress points and the mechanical performance of the aramid fibers by winding the aramid fibers on the winding pinions, simplify operation process and avoid pollution during encapsulation.

The present invention relates to the radio frequency test technology field, especially to a method and a device of signal connection of a mainboard and a small board. The device comprises a radio frequency test device, and a mainboard and a small board arranged on the radio frequency test device. The main board is provided with a test bench, and the small board is provided with a radio frequency connection head; the test bench is configured to calibrate and test the indexes of radio-frequency signals; the radio frequency connection head is configured to connect the radio-frequency signals to a mobile phone antenna; and a radio-frequency connecting line is connected between the test bench and the radio frequency connection head. The method and device of signal connection of the mainboard and the small board are firm and stable in structure, small in occupied wiring area of the mainboard, low in cost and small in the radio-frequency signal insertion loss, etc.

The invention discloses an ultra-short baseline positioning method based on an adaptive unscented Kalman filter. The ultra-short baseline positioning method based on the adaptive unscented Kalman filter comprises the following steps: step 1, an ultra-short baseline is used for underwater positioning; step 2, the position information of a mother ship and the position information of an underwater robot positioned by using the ultra-short baseline are sent to the underwater robot through a photoelectric hybrid cable; step 3, the underwater robot receives the position information sent by the mother ship; and step 4, the underwater robot fuses the position information with the carried accelerometer, inertial navigation, depth gauge and other sensors, and attenuates the noise according to the adaptive unscented Kalman filter. The ultra-short baseline positioning method based on the adaptive unscented Kalman filter has simple operation, and can improve the underwater positioning accuracy of the underwater robot by fusing the multiple sensors and the ultra-short baseline positioning information.

Disclosed is a coaxial cable male connector for transmitting super-high frequency signals, which is used in a coaxial cable connector for transmitting super-high frequency signals and is received in aconnector socket mounted on a printed circuit board (PCB) to connect multiple coaxial cables to the PCB. The coaxial cable male connector includes: a single or multiple coaxial cables each includingan inner conductor, an outer conductor, a dielectric, and a sheath, wherein the outer conductor, the dielectric, and the sheath are partially stripped to expose the inner conductor over a predetermined length, and a terminal of the exposed inner conductor is brought into electrical connect with a signal line terminal pad formed on the PCB; and a shielding can receiving the exposed inner conductorsof the single or multiple coaxial cables, securing and protecting ends of the exposed inner conductors, and blocking electromagnetic waves generated from the inner conductors.

The invention relates to the field of optical communication and the field of underwater acoustics, in particular to a cross-medium air-to-underwater laser-induced acoustic communication method and device. The time interval and energy of laser pulses emitted by a laser are controlled through digital information coding, thereby exciting laser signals with different frequencies and different characteristics; pulse laser signals are transmitted through air, so that laser energy interacts with a water medium in an optical breakdown mode after reaching the water surface, then laser pulses are converted into sound wave signals, the sound wave signals are spread in all directions underwater, and the sound wave signals are received through a hydrophone at any position underwater. Therefore, signal transmission from air to underwater is realized, information transmission is further carried out, and underwater acoustic communication is realized.

The invention discloses a multi-channel DDS (Direct Digital Synthesizer) chip substrate packaging structure and method, which are used for designing wiring of multi-channel differential pair signals,layout of a power supply ground plane and arrangement of bonding fingers and leading-out ends. The differential pair of each channel adopts an arc-shaped routing and non-parallel routing mode; power supply ground planes are laid in the horizontal direction, the lower layer and the lower layer of the differential pair, the power supply ground planes of all the channels are independent of one another and keep a certain isolation distance, crosstalk and coupling between the power supply ground planes of all the channels are reduced, signal loss of the multi-channel DDS chip is remarkably reduced,and isolation between all transmission channels is improved. The technical problems that in the prior art, attenuation of multi-channel DDS chip signals is increasingly serious, and the isolation degree between transmission channels is increasingly low are solved.

The invention discloses a butterfly optical cable, which comprises a pair of reinforcing members and a main member. The pair of reinforcing members are arranged at the two sides of the main member. The side, close to the main member, of each reinforcing member is provided with a sharp edge. The sharp edges are connected with the main member through adhesion layers respectively; the sharp edges protrude to the inner sides of the main member; the sharp edges are connected with extension portions; the extension portions cover the outer surfaces of the reinforcing members; the sharp edges and the extension portions are made of a pressure-resistant material; the main member is internally provided with a foaming layer; the foaming layer is made of a foam material; the foam material is internally filled with nitrogen, nitrogen pressure being larger than or equal to 1.5 standard atmospheric pressure; an optical fiber is arranged in the foaming layer; and the radial height of the main member is smaller than or equal to that of the reinforcing member. Through the arrangement of the reinforcing members having the sharp edges and the extension portions, the pressure-resistant performance of the reinforcing members is better; meanwhile, the sharp edges are connected with the main member through adhesion layers respectively, so that the sharp edges can be separated from the main member more easily, and after separation, the main member forms two opposite grooves; and the optical fiber can be obtained by tearing away the foaming layer. The cable is simple to operate and excellent in protection performance.

The invention discloses a light switching apparatus, wherein a mobile support plate is provided two or more optical fiber connecting seats thereon, and each optical fiber connecting seat is respectively connected with an optical fiber path; and the mobile support plate is driven to move or to rotate by a driving device, to enable the optical fiber connecting seats on the mobile support plate to be switched to a corresponding position of an optical fiber connector and to enable the optical fiber connector to be fixed on one corresponding optical fiber connecting seat. The switches for different optical fiber paths can be achieved through a pure-mechanism type motion mode, and the apparatus is in no need of any optical element and has the advantages of simple structure, low cost, low signal loss, etc.

The invention discloses a non-contact glass capillary diameter control method which comprises the following steps: depositing a fluorine-doped quartz low-refractive-index layer in a quartz base tube by using vapor deposition equipment, corroding and polishing the outer wall of the base tube by using hydrofluoric acid, and then drawing to manufacture a low-refractive-index quartz capillary; selecting a corresponding number of single-core optical fibers, removing coating layers of the single-core optical fibers through chemical corrosion, and inserting the plurality of single-core optical fibers into a low-refractive-index quartz capillary; using a tapering system for carrying out equal-proportion heat insulation tapering on the quartz capillary sleeve and the single-core optical fiber, thinning the quartz capillary, reducing the diameter at the taper waist to be equal to that of the multi-core optical fiber, and degrading the diameter of the internal single-core optical fiber to be matched with the fiber core of the multi-core optical fiber; measuring the tapering area, observing the diameter change of the tapering area, and cutting the tapering waist by using an optical fiber cutter to obtain a tapering body; and aligning and welding the cut cone and the multi-core optical fiber, and finally packaging to form the single-core optical fiber and multi-core optical fiber coupler.