38results about How to "Improve bandwidth characteristics" patented technology

A piezoelectric thin film resonator has a substrate and a piezoelectric layered structure including a lower electrode, piezoelectric aluminum nitride thin film with c-axis orientation and upper electrode formed on the substrate in this order. The lower electrode are made of a metal thin film including a layer containing ruthenium as a major component having a full-width half maximum (FWHM) of a rocking curve of a (0002) diffraction peak of ruthenium of 3.0° or less. The piezoelectric aluminum nitride thin film formed on the lower electrode has a full-width half maximum (FWHM) of a rocking curve of a (0002) diffraction peak of 2.0° or less.

A tunable top-pole passive notch circuit for attenuating select frequencies of a multi-frequency CATV signal. The circuit includes an input for receiving a multi-frequency CATV signal, and an output for transmitting a portion of the multi-frequency CATV signal, A filter network for attenuating a band of frequencies from the multi-frequency signal is distributed been the input and the output. The filter network includes three parallel branches A, B, and C, each being arranged in series connection between the input and the output. Branch A includes an inductor. Branch B includes an adjustable parallel tank circuit Branch C includes a second adjustable electrical resonator. The filter has frequency response characteristics that are more stable than prior art two-pole notch filters, and similar to the response characteristics of more complex three pole or four pole notch filters. The two-pole tunable notch filter circuit provides a passband response to 1 GHz.

The invention discloses a high-isolation double-unit MIMO (multiple input multiple output) antenna array which is characterized in that: two independent resonant modes are produced through two C-like radiating units and two inverted-L-shaped radiating units printed on the front and back surfaces of a dielectric substrate, and used for controlling the double frequency characteristics of an antenna; and on the premise of realizing double-frequency coverage, a decoupling structure is formed on an additional floor unit printed on the front surface of the dielectric substrate and an isolation groove formed on a floor, so that the isolation between antenna units in a multi-frequency range is improved, and the bandwidth performance of dual-frequency operation is ensured.

The invention discloses a dual-frequency dual-polarization cavity backed slot antenna which is compact in structure. The dual-frequency dual-polarization cavity backed slot antenna is divided into an upper structure, an intermediate structure and a lower structure, wherein in the upper structure (1), a single metal sheet (11) and a dielectric supported metal foil (12) of a metal round slot director which are used as antenna directors are positioned on a dielectric plate (23); in the intermediate structure (2), a double-arm feed circuit (22) is positioned above the dielectric plate (23), and a crisscross slot metal surface (24) is positioned below the dielectric plate (23); and the lower structure (3) is a rectangular or elliptical metal waveguide cavity or a rectangular or elliptical SIW (Substrate Integrated Waveguide) cavity. According to the dual-frequency dual-polarization cavity backed slot antenna, because the rectangular or elliptical waveguide cavity generates required dual-frequency resonant frequency and the antenna generates effective radiation on dual frequency bands by the special directors, a dual-frequency dual-polarization working mode is achieved, frequency spectrum sharing and efficient information transmission are realized in different frequency bands and the frequency spectrum utilization rate is increased.

A suspended well logging apparatus is provided having downhole well data acquired by a sensor, transmitted to the surface via complementary modems, and conveyed to the surface modem via a data transmission cable linking the modems, the cable having at least one twisted pair of signal conductors positioned within an outer protective sheath, each of the conductors being separately insulated, the at least one twisted pair of signal conductors having a twist rate of at least ⅙ twist per inch, an insulation sheath surrounding the twisted pair of conductors and a tensile load carrier surrounding the insulation sheath, the load carrier comprising a sheath of tensile load carrying filaments enabling self support of the well logging cable.

An apparatus and method for extracting energy from an internal combustion engine includes a chamber having a primary piston and a secondary piston with a combustion portion of the chamber situated adjacently between the primary piston and secondary piston. The secondary piston includes a substantially lesser mass than that of the primary piston. The chamber includes at least one fluid port for supplying fuel to the combustion portion and an out-take port for releasing combustive exhaust. The chamber includes a controller for controlling the combustion therein at selected cycles of the primary piston. The secondary piston is configured to draw a portion of energy from combustion controlled by the controller in the chamber. Such portion of energy is provided with a rapid response to an energy transferring portion interconnected to the secondary piston, which in turn, transfers and/or converts the energy for acting on a load or external application.

The invention discloses a personnel security information collecting system based on a wireless ad hoc network and a working method thereof and belongs to the field of electronic devices, wireless communication and the GPS positioning technology. According to the personnel security information collecting system, intelligent bracelet terminals collect security information periodically and transmit the information to a portable application terminal through a wireless communication base station, and the portable application terminal displays coordinates and the security information of the intelligent bracelet terminals through a map and performs unified management on all the intelligent bracelet terminals. The personnel security information collecting system has real-time performance and intelligent performance, and is applicable to various scenes of production and life. The intelligent bracelet terminals and the wireless communication base station perform ad hoc networking through ZigBee, and the wireless communication base station is communicated with the portable application terminal through bluethooth. By adopting the bluetooth and the ZigBee, complementation of advantages of the bluetooth and the ZigBee is achieved, and a flexible ad hoc network function and low power consumption of a ZigBee protocol and high bandwidth of the bluetooth are made full use of.

A compact multiple-frequency Z-type Inverted-F antenna includes a dielectric substrate having a horizontal axis and a vertical axis perpendicular to the horizontal axis. A feed point is disposed along the horizontal axis on a first side of the vertical axis and a ground strip is disposed along the horizontal axis on a second side of the vertical axis opposite the feed point. A plurality of wedge-shaped radiating traces is arranged symmetrically with respect to the horizontal axis and disposed on the first side of the vertical axis. A plurality of wedge-shaped ground traces symmetrical to the plurality of radiating traces with respect to the vertical axis are disposed on the second side of the vertical axis.

The invention discloses a slot printing monopole ultra-wideband antenna, and relates to an ultra-wideband antenna. The invention provides the slot printing monopole ultra-wideband antenna with small size, large bandwidth, lower return loss, simple structure and omnidirectional radiation property. The slot printing monopole ultra-wideband antenna is provided with a dielectric substrate, a rectangular and trapezoidal structural array body is printed on the dielectric substrate, the lower bottom of the trapezoid is placed on the rectangle in the middle, the array body is provided with a slot, the array body is reversely placed at the top end of the dielectric substrate, the lower edge of the array body is connected with a microstrip line, the microstrip line is connected with a radiating element, and the microstrip line extends to the edge of the dielectric substrate; and the lower end of the back of the dielectric substrate is provided with a grounding plane, and a clearance is formed between the grounding plane and the array body on the facade of the dielectric substrate.

A mobile terminal according to the present invention, comprises: a first patch antenna operating in a first frequency band and having a circular or polygonal shape; and a second patch antenna operating in a second frequency band that is higher than the first frequency band and having a shape different from the shape of the first patch antenna, wherein through the patch antennas having different shapes, isolation between the antennas operating in different frequency bands can be improved.

The invention discloses a 1090ES signal expansion method based on phase modulation, and relates to the field of civil aviation air traffic management monitoring. The process of signal processing includes the following steps that data information is collected by a signal transmitting terminal, phase dual modulation is carried out on PPM and a sub-pulse, an expansion signal is transmitted, the expansion signal is received and synchronized by a signal receiving terminal, and demodulation is carried out on PPM information and phase information. The key technology and effect are characterized in that in the modulation process, a piecewise linearity phase transition method is used to solve a frequency spectrum problem caused by phase mutation, and a band width character of an expanded 1090ES signal is improved effectively; in the carrier-frequency synchronization process, twice synchronization is performed by using a front guide pulse and a four-digit pulse, the quickness and accuracy of the synchronizations are guaranteed, and a special synchronization problem of multiple output and single input of an ADS-B receiver is solved effectively; in the base band phase information demodulation process, a phase judgment method based on error forward feedback is used, and the accuracy of the phase judgment is improved effectively.

The invention discloses a multi-frequency band novel Koch fractal antenna for a mobile terminal. The fractal antenna includes a radiator, a ground plate, a medium substrate, and a feed line. The radiator, the feed line, and the ground plate cover the right side of the medium substrate. The back side of the medium substrate is also designed with an inductance loop. The radiator adopts a Koch fractal structure with a central position hollowed, and the hollowed structure is of a Koch fractal structure which is arranged in the same orientation as the radiator. According to the invention, the fractal antenna conducts optimal control on the hollowed structure of the radiator main body of the antenna and an added loop mechanism to change the direction of the current on a metal surface of the antenna, so that the radiation of multi-frequency band mode is achieved.

The invention provides an LED display screen control device and control method capable of carrying out pixel random arrangement, and the device comprises a decoding chip which is used for decoding a video source signal into a TTL video signal; a coding chip which is used for coding the VESA standard signal into a differential signal; a SRAM array which is used for storing TTL video signals; a SPIFLASH which is used for storing an address table; a SDRAM which is used for transferring the address table; an FPGA module which is used for randomly reading the video pixel data stored in the SRAM array according to the address table; and a MCU which is used for configuring and monitoring the coding chip, the decoding chip and the FPGA module. According to the method, the high-bandwidth characteristic of the SDRAM during continuous access and the high-bandwidth characteristic of the SRAM during random access are fully combined, the output picture is changed in the mode that the address table is issued through software, and the display requirement of multi-scene change is met.

The invention proposes a single-chip integrated wavelength division multiplexing single-fiber bidirectional data transmission module, and the module comprises a wavelength division multiplexing module, a wavelength division demultiplexing module and an optical circulator. A first comb filter, a second comb filter and a third comb filter are integrated on the wavelength division multiplexing module, and the first end and the second end of the first comb filter and the first end and the second end of the second comb filter respectively serve as the input ends of the wavelength division multiplexing module for receiving four optical signals with different wavelengths. A fourth comb filter, a fifth comb filter and a sixth comb filter are integrated on the wave demultiplexing module. The firstend and the second end of the fourth comb filter and the first end and the second end of the fifth comb filter respectively serve as four output ends of the wave decomposition demultiplexing module for outputting four optical signals with different wavelengths. PBSs in the optical circulator are prepared by the optical waveguide technology, and a single-mode optical waveguide between the PBSs arelaterally grooved, and a polarization conversion component is inserted, thereby realizing the loop transmission of the optical signals between the three ports.

The invention discloses a planar multi-port high-isolation broadband triplexer integrated antenna, which belongs to the field of antennas. The antenna is based on a single-layer dielectric plate, the lower surface of the antenna is a grounding metal patch, two symmetrical square grooves are etched, and the two square grooves are connected through a gap strip to form a dumbbell-shaped groove; the upper surface is provided with a partial feed structure and is provided with three ports; the feed network of the first port and the feed network of the third port are located on the top layer of the dielectric plate, the feed lines are perpendicular to each other, the feed network of the second port is right opposite to the third port, and the feed network of the second port and the ground plane are jointly attached to the bottom layer of the dielectric plate; the first port is slot coupling feeding and is composed of a feeder line and a stepped impedance resonator; the second port is coplanar waveguide feed and comprises a feeder line and symmetrical Y-shaped microstrip branches; the third port is a coupling feed port and comprises a feed microstrip line and a T'-shaped microstrip line stub, the three feed ports are excited at the same time, simultaneous sending and receiving of the antenna are achieved, and different feed modes are beneficial to achieving high port isolation.