46results about How to "Stable bandwidth" patented technology

The invention discloses a dual polarization base station antenna with Y-shaped feed units. The dual polarization base station antenna with the Y-shaped feed units comprises a dielectric substrate, a metallic reflection plate, a first coaxial line and a second coaxial line. The two sides of the metallic reflection plate are provided with metal flanges. The lower surface of the dielectric substrate is provided with a first annular radiating element, a second annular radiating element, a third annular radiating element and a fourth annular radiating element, wherein the first annular radiating element and the second annular radiating element are in mutual symmetry to form a first antenna structure, and the third annular radiating element and the fourth annular radiating element are in mutual symmetry to form a second antenna structure. The upper surface of the dielectric substrate is provided with the first Y-shaped feed unit and the second Y-shaped feed unit. The first coaxial line is connected with the second annular radiating element and the first Y-shaped feed unit. The second coaxial line is connected with the fourth annular radiating element and the second Y-shaped feed unit. The dual polarization base station antenna is good in performance, simple in structure, easy to process, low in processing cost and convenient to adjust.

To provide a wireless multi-hop network in which the stable bandwidth ensured communication can be made without causing a collision of time slots due to the terminal movement or reserving the slot again due to a route change on the path of end-to-end communication. A terminal makes a slot allocation request for 3 Hops to a slot allocation server. Since unique slots within the network are allocated by the slot allocation server, there is no interference with the slots by other terminals. The terminal transmits the packet by inserting the slot information into an option header. A forwarding terminal that forwards the packet decides the transmission slot based on the slot information in the option header and its own hop count at the time of forwarding the packet.

The apparatus includes a series active continuous time voltage regulator operating in conjunction with a alternating current power source and one or more loads. The alternating current power source is a voltage source that induces currents at a first end of the apparatus. At a second end of the apparatus one or more loads consume power from the apparatus. The series buck-boost regulator is composed of a pure monochromatic voltage source of frequency equal to that of the alternating current power source, and of constant phase with respect to the alternating current power source. The regulator is further composed of a sampling network that provides a scaled continuous time sample of the voltage delivered by the power conditioner to the loads. Finally, the regulator is composed of a high gain differential amplifier. The components of the regulator are configured to operate as a continuous time feedback control system that generates an error correction voltage that, when added to the voltage of the alternating current power source, results in an output voltage from the power conditioner that is a scaled replica of the monochromatic reference voltage. As a result, the voltage delivered by the power conditioner to the loads is substantially corrected of spectral impurities and impervious to the specific conditions of the alternating current power source or of the loads.

The invention discloses a differential feed dual-polarization direction diagram reconfigurable antenna. The antenna comprises a medium substrate, an antenna radiation unit, a micro-strip line feed structure, parasitic units and a coaxial feed unit; the antenna radiation unit comprises a first double dipole and a second double dipole vertical to each other; four pairs of parasitic units are arranged around the antenna radiation unit; each pair of parasitic units load the switch; the micro-strip line feed structure comprises a first feed micro-strip line and a second feed micro-strip line in mutual vertical arrangement, and an intersection point is located at a center point of the medium substrate; and the coaxial feed unit performs the feeding on the antenna radiation unit. The differentialfeed structure disclosed by the invention is convenient to integrate with a radio frequency front-end. The differential feed dual-polarization direction diaphragm reconfigurable antenna has the advantages of being small in volume, light in weight and simple in structure, the polarization way of an x axle direction and a y axle direction, and the reconfigurable direction diaphragm of each of the Esurface and the F surface can be realized.

The invention relates to a method for multi-user bandwidth balanced configuration. The method comprises the following steps: 1, setting an initial value of an uplink port total bandwidth VS; 2, setting the configuration bandwidths Vavg of N users according to Vs; 3, acquiring the actual velocity VTi of each user according to a certain detection period, and calculating the actual total bandwidth VT of all the current users; 4, judging whether the value of the uplink port total bandwidth VS needs to the adjusted or not according to the value of the current actual total bandwidth VT, and if yes, adjusting the value of VS; 5, judging whether the actual velocities of all the users are larger than or equal to the current configuration bandwidth Vavg or not, if yes, returning to the step 2, and if not, executing a step 6; and 6, adjusting the configuration bandwidths of the users with the current actual velocities being smaller than the configuration bandwidths to VTi (1+x), and distributing the residual bandwidths to the residual users. Compared with the prior art, the method has the advantages of stabilizing the user bandwidths, increasing the bandwidth utilization rate and the like.

The invention discloses a full-bandwidth rectangular waveguide coaxial conversion device. The device comprises a rectangular waveguide body. An opening is arranged in the front end of the rectangularwaveguide body, and the back is a cut-off wall. The device is provided with a coaxial connector. The metal inner shaft of the coaxial connector is connected with a metal probe in the rectangular waveguide body from the outer side of the bottom of the rectangular waveguide body. The outer side of the probe is coated with a non-metal dielectric layer. The non-metal dielectric layer is made of polytetrafluoroethylene. A metal body perpendicularly connected with the bottom wall of an inner cavity is arranged in the cavity of the rectangular waveguide body. The metal body is located on the front side of the probe. According to the invention, the reflection coefficient of the full waveguide bandwidth is greatly reduced; the insertion loss is effectively reduced; the conversion efficiency is improved; the effect is stable; and due to simple structure and easy processing and molding, the device can be widely used in a rectangular waveguide wave tube technology in the field of microwave communication in a standardized way and in a full-bandwidth spectral range.

The invention discloses an encoding method, a decoding method, an encoding end and a decoding end, and belongs to the technical field of multimedia. The method comprises the following steps that the encoding end encodes a key frame in a video sequence to obtain the first encoded data; the encoding end encodes a non-key frame in the video sequence to obtain the second encoded data; and redundancy processing is carried out on the key frame used for determining the second coded data according to an FEC algorithm to obtain a redundant data packet, so that the difference value between the bandwidthused by the encoding end for sending the second encoded data added with the redundant data packet to the decoding end and the bandwidth used by the encoding end for sending the first encoded data iswithin the reference difference value, the bandwidth used in the process of transmitting the encoded data can be kept stable for different types of video frames, and meanwhile, when an encoded data loss phenomenon occurs at the decoding end, the key frame can be restored according to the redundant data packet, and accordingly the success rate of decoding the second coded data by the decoding end is improved.

The invention relates to the field of electronics, and discloses a self-adaptive loop compensating method, a compensating circuit and a switching power supply with the compensating circuit. The self-adaptive loop compensating method includes the steps that current output voltages of the switching power supply are determined; bias currents are generated according to the output voltages and are in linear relation with the output voltages; the bias currents are input into a bias control end of an error amplifying circuit; the error amplifying circuit compares current output feedback voltage signals of the switching power supply with preset output feedback reference signals under the control of the bias currents to generate error compensation voltages and controls output of the switching power supply according to the error compensation voltages. According to the technical scheme, the problem that a bandwidth becomes narrower along with increasing of the output voltages can be avoided, and a stable transient response of the switching power supply can be further guaranteed.

The invention discloses a broadband filter with adjustable trapped wave. The broadband filter comprises a single-layer quarter-mode substrate integrated waveguide resonant cavity, wherein a signal metal layer is in the shape of an isosceles right triangle, a signal input microstrip line and a signal output microstrip line are arranged along the two right-angle sides of the signal metal layer respectively, a first gap is etched in the position, close to the signal input microstrip line, of the signal metal layer, a second gap is etched in the position, close to the signal output microstrip line, of the signal metal layer, a first adjustable device is arranged in the first gap, and a second adjustable device is arranged in the second gap. According to the invention, a variable capacitance diode is loaded in the port gap of the broadband filter, a bias voltage is loaded at two ends of the variable capacitance diode, a narrow stop band can be superposed on the basis of the original broadband of the broadband filter so as to introduce the trapped wave frequency, the continuous adjustment of the trapped wave frequency in a full-passband range can be realized by changing the capacitance value of the variable capacitance diode, and a PIN diode is utilized to play a role in adjusting the frequency, so that the self-adaptive capability of the broadband filter is enhanced.

A sigma delta modulator (350) can be utilized in the Digital-to-Analog (DAC) portion (144) of a modem (120) to achieve a desired level of gain programming. A set of step coefficients (GP2, GP4) are utilized to determined the step size and thereby the overall gain of the modulator (350). A feedback path is provided and configured to deliver the output of the modulator to a gain control block (355) which provides control and stability across the entire transmission bandwidth. A multilevel digital output (320) is provided which represents levels of signal in the digital domain and reduces the number of discrete components required to achieve a particular amount of gain.

An inter-resonator coupling scheme for a filter is disclosed. An inter-resonator coupling member is located between successive resonators in the filter. By adjusting the length and/or the proximity of the inter-resonator coupling member relative to the adjacent resonators, the ratio of energy transferred from resonator to resonator (via the inter-resonator coupling member) may be increased and/or decreased. By increasing the ratio of energy transferred from resonator to resonator, the bandwidth of the filter is increased and is made relatively insensitive to tuning which may occur via manipulation of field disturbances introduced by tuning tips. The inter-resonator coupling member is made of a conductive or superconductive material and contains at least three sections. The first section runs substantially parallel to an edge of the first resonator that is not profoundly influenced by the source of field disturbance. The third section runs substantially parallel to an edge of the second resonator that is not profoundly influenced by the source of field disturbance. A second section connects the first and third sections.

The invention provides a scheduling method. The scheduling method comprises the following steps of: determining the bandwidth required by a file requested and accessed by a client side, and constantly distributing the bandwidth to the client side; and, when transmission of the file requested and accessed by the client side is ended, disconnecting the client side, and recycling the bandwidth to the total bandwidth. The invention further provides a corresponding system. Compared with the manner of detecting the bandwidth (such as routing exploration) in real time in the prior art, the scheduling method and system in the embodiment of the invention have the benefits that: data distributed by bandwidths of various client sides can be accurately controlled through the method in the embodiment of the invention; therefore, the bandwidths of various client sides are very steady while accessing the file; the problem that bandwidth distribution of other client sides is also influenced due to the fact that the access speed is unsteady when one client side is failed or has an unexpected incident can be avoided; reduction of the system performance is avoided; and thus, the user experience is improved.

The invention relates to the technical field of fiber gratings and fiber lasers, and particularly discloses a stable seed source used for a high-power master oscillator power-amplifier (MOPA) pulse laser. The stable seed source comprises an F-P semiconductor laser, the fiber gratings, optical fibers used for manufacturing the fiber gratings and a depolarizer, wherein the F-P semiconductor laser, the fiber gratings, the optical fibers and the depolarizer are successively arranged along the light transmission direction. The stable seed source is a signal light source which is simple in structure, stable in central wavelength, stable in peak wavelength, stable in linewidth, low in cost and great in performance and can act as the fiber laser through amplification, then the optical fibers are connected with the simple and cheap depolarizer, and the laser polarization obtained through the depolarizer is greater than or equal to 10DB so that the light is close to non-polarized light, the light is amplified and passes through a vibrating mirror and then laser processing is performed and thus the fine processing precision can be achieved.

The invention discloses a method and a device for reducing message bandwidth of a chat room, and computer equipment. The method comprises the following steps: dynamically adjusting a message compression threshold value of the chat room in real time according to the message quantity and the load condition of the chat room, and simplifying all event field contents of the chat room after the messagecompression threshold value is adjusted, and adding high-frequency message events of which the real-time performance cannot reach a preset threshold value in the chat room after all event field contents are simplified into a message queue mechanism to form a channel list, and adding the high-frequency message events of which the real-time performance requirements are not too high into the messagequeue mechanism; and controlling the instant message concurrency of the high-concurrency live broadcast scene of the chat room by dynamically modifying the queue threshold of the queue in the channellist. Through the above mode, the bandwidth consumption of the high-concurrency live broadcast scene of the chat room can be reduced so as to ensure the bandwidth stability of the chat room.

The invention discloses a differential feed pattern reconfigurable antenna, which comprises a dielectric substrate, a microstrip feed structure, a coaxial feed line unit, an antenna radiation unit anda parasitic unit, wherein the back surface of the dielectric substrate is etched with the microstrip feed structure for feeding the antenna; the front surface of the dielectric substrate is etched with the antenna radiation unit and the parasitic unit; the antenna radiation unit has a planar structure and comprises a first dipole and a second dipole which are parallel and are grooved, the first dipole and the second dipole are symmetrical about the center of the dielectric substrate, and the parasitic unit is arranged at two sides of the antenna radiation unit. By adopting a differential feedstructure, integration with a radio frequency front end is facilitated, the size is small, the weight is light, the structure is simple and patterns on an E plane and an H plane are reconfigurable.

The invention provides a communication structure for Ferris wheels. By employing wireless network links connecting first wireless communication access machines and second wireless communication access machines and using communication signal coverage of gondolas and the rim, a wireless signal can cover specified gondolas in the whole process. Links between first switches on the hub and the second wireless communication access machines on the rim are connected by optical fibers. A second switch is installed on each side of the axis. A leaky cable is laid on the same side as the hub. Thus, it is ensured that the links between the second switches on the axis and the first switches on the hub can keep the wireless signal near the cable without being affected by other environments. Reliable signal and stable bandwidth are ensured during movement. Complete coverage of the wireless signal is realized. The network-side bottleneck problem for wireless-to-wired conversion is solved.

The invention discloses a subsampling phase-locked loop. The subsampling phase-locked loop comprises a phase detector, a charge pump, an oscillator and a buffer, in operation of the subsampling phase-locked loop, the phase detector uses a reference frequency signal to sample a feedback signal to generate a first phase detection result, and the charge pump generates a control signal according to the first phase detection result and a pulse signal; the oscillator generates an output frequency signal according to the control signal; and the buffer is used for receiving the output frequency signal, generating the feedback signal and controlling the slew rate of the feedback signal according to a slew rate control signal.