39results 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 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.

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.

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 present invention relates to a multimode optical fiber and a manufacturing method thereof. The diameters of the core layer and the cladding layer of the multimode optical fiber are 50 μm and 125 μm respectively, and its refractive index distribution is precisely optimized at a wavelength of 850 nm. The differential mode delay test curve of the optical fiber is: A continuous rising or falling curve, and its maximum change is less than 0.22ps / m, the full injection bandwidth is greater than 1500MHz·km at 850nm, greater than 600MHz·km at 1300nm, and the effective bandwidth is greater than 2000MHz·km and 600MHz·km at 850nm and 1300nm respectively. In its manufacturing method, the deposition rate is from 2.5g / min to 1.5g / min, the flow rate of germanium vapor is from 3% to 60%, and the diameter of the shrinkage hole is controlled to be between 2 and 8mm in diameter during melting and shrinkage, and then the C 2 f 6 The corrosive gas corrodes the inner tube wall; the optical fiber is rubbed during the drawing process. The invention completely eliminates the center depression of the multi-mode optical fiber, reduces inter-mode delay, increases the bandwidth of the optical fiber, and can be used not only in high-speed network systems, but also in low-speed network systems.

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.

The invention discloses a 1090ES signal expansion method based on phase modulation, and relates to the field of civil aviation air traffic control surveillance. The signal processing process includes: collection of data information by the signal transmitter, dual modulation of PPM and sub-pulse phase, transmission of expansion signals, reception and synchronization of expansion signals by the signal receiver, demodulation of PPM information and phase information. The key technologies and effects are: 1. The modulation process adopts the segmented linear phase transition method to solve the spectrum expansion problem caused by the phase mutation, which effectively improves the bandwidth characteristics of the 1090ES signal after capacity expansion; 2. The carrier frequency synchronization process uses the leading pulse and 4-bit data The pulse is synchronized twice, which ensures the fast and accurate synchronization, and effectively solves the special multi-send and single-receive synchronization problem of the ADS-B receiver; 3. The demodulation process of the baseband phase information adopts a phase based on error forward feedback Judgment method effectively improves the accuracy of phase judgment.

This invention relates tone base integrating wave feedback structure super wide antenna in the wireless communication field, which comprises the following parts: input or output ends, micro band feedback unit, antenna unit, gradually change unit, even transmission unit, over hole unit, co-surface waveguide unit and each unit, wherein, four antenna units are in circle shape with even transmission units connected each two and with orderly decreased sizes from outside to center to form branch structure.

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 provides a control device and a control method for an LED display screen capable of arbitrarily arranging pixels. The device includes: a decoding chip for decoding a video source signal into a TTL video signal; an encoding chip for converting VESA standard signals Encoded into differential signal; SRAM array, used to store TTL video signal; SPIFLASH, used to store address table; SDRAM, used to transfer address table; FPGA module, used to randomly read video pixels stored in SRAM array according to the address table Data; MCU, used to configure and monitor the encoding chip, decoding chip and FPGA module. The invention fully combines the high-bandwidth characteristics of SDRAM in continuous access and the high-bandwidth characteristics of SRAM in random access, and changes the output screen by issuing an address table through software to meet the display requirements of multi-scene changes.

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.