14results about How to "Increased Gain Bandwidth" patented technology

The invention discloses a waveguide power dividing device with a ridge on an H surface and a waveguide antenna, and belongs to the technical field of antennae, the waveguide power dividing device comprises a waveguide power divider, the waveguide power divider adopts a T-shaped structure, the waveguide power divider is provided with a waveguide transmission line, a branch waveguide A and a branch waveguide B, and the ridge is arranged on the H surface of the waveguide power divider; the feed end of the waveguide transmission line is used for feeding, the radiation end of the branch waveguide A and the radiation end of the branch waveguide B are used for radiation, and the electric fields of the radiation end of the branch waveguide A and the radiation end of the branch waveguide B are in the same phase. According to the invention, the problem that the directions of electric fields are opposite when H-plane waveguide feed passes through a one-to-two power divider is solved. According to the waveguide antenna, the waveguide power divider with the H face and the ridge is adopted, the complex structure of waveguide E-to-H is simplified, and meanwhile the profile of the antenna can be further reduced; the waveguide antenna provided by the invention has the characteristics of ultra wide band, wide beam, low side lobe and the like.

The invention discloses an optical comb frequency control system and method for a photo-generated ultra-stable microwave source, and the system comprises at least one optical comb signal frequency adjustment loop which comprises an optical frequency comb, a phase discriminator, a phase difference extraction circuit, and a PID circuit. The output end of the optical frequency comb is electrically connected with the input end of the phase discriminator, one input end of the phase discriminator is also connected with a reference signal, the output end of the phase discriminator is electrically connected with the input end of the phase difference extraction circuit, the output end of the phase difference extraction circuit is electrically connected with the input end of the PID circuit, and the output end of the PID circuit is electrically connected with the input end of the optical frequency comb. According to the invention, an optical comb frequency control system with a larger phase discrimination range, lower bottom noise and higher gain bandwidth can be realized.

The application discloses a kind of intelligent reflecting surface unit with wideband low loss and intelligent reflecting surface, including interval air layer arrangement first dielectric substrate and second dielectric substrate, the first dielectric substrate one side is provided radiation patch, the one side of the second dielectric substrate is provided metal ground plate, the other side of second dielectric substrate is provided direct current control line, the radiation patch includes multiple coplanar metal patches, each metal patch is slotted in vertical direction and is connected using varactor, by controlling the direct current voltage at both ends of multiple varactors, so that the phase shift of intelligent reflecting surface unit continuously changes.The application not only reduces the reflection loss of unit, improves the directivity coefficient bandwidth of intelligent reflecting surface antenna, and the radiation performance has good stability in frequency band.

The invention discloses an arbitrary dielectric constant end-on-fire leaky-wave antenna based on subarray alternation. The antenna comprises an upper metal layer, a dielectric substrate and a lower metal layer which are sequentially arranged from top to bottom, the upper-layer metal comprises a first metal wire and first sub-arrays which are alternately arranged on the two sides of the first metal wire; the lower-layer metal comprises a second metal wire and second sub-arrays which are alternately arranged on the two sides of the second metal wire; the first sub-array and the second sub-array are symmetrical relative to the axis I of the first metal wire and the second metal wire; the first sub-array and the second sub-array comprise one or more radiation units with the same number. According to the antenna, a stable end-fire directional diagram is generated through spatio-1 harmonic radiation, an end-fire leaky-wave antenna can be realized on a dielectric substrate with a lower dielectric constant, the processing difficulty is reduced, and meanwhile, a higher gain length ratio and a larger gain bandwidth are realized.

The application relates to the technical field of wireless communication, and discloses a novel wide-band ceramic antenna. The novel wide-band ceramic antenna comprises first, second and third ceramic antennas of the same size stacked together from top to bottom; the first and third ceramic antennas are provided with transmitting / receiving end electrodes and feeding electrodes; the first, second and third ceramic antennas are provided with transverse electrodes and longitudinal electrodes, and the transverse electrodes and the longitudinal electrodes are provided with metal through holes. The first, second and third ceramic antennas are stacked to reduce the antenna volume and the installation difficulty; the first and third ceramic antennas are respectively provided with transmitting / receiving end electrodes and feeding electrodes, a plurality of transmitting / receiving end electrodes and feeding electrodes are arranged, the antenna bandwidth is effectively enhanced, and the radio frequency performance and the frequency band coverage range are enhanced. The metal through holes are arranged on the antenna electrodes, the distributed inductance is increased, the antenna standing wave bandwidth and the gain bandwidth are strengthened, and the increase of the antenna frequency band coverage range is realized. The application further discloses a wireless temperature and humidity sensor.

The invention provides an erbium-doped optical fiber, a preparation method thereof and an erbium-doped optical fiber amplifier, the erbium-doped optical fiber comprises a fiber core, the fiber core comprises a silicon dioxide matrix, an erbium element and a zirconium element, the erbium element and the zirconium element exist in the silicon dioxide matrix, and the mass percentage content of the zirconium element in the fiber core is 0.01%-5%. According to the invention, the gain bandwidth and gain performance of the erbium-doped fiber can be improved, and the noise is reduced.

The application provides an integrated mode-locked laser chip structure, a measuring system and a manufacturing method, which comprises a doped film, a gain microcavity and a modulation module, the gain microcavity is formed on the surface of the doped film, the modulation module is used for locking the phase of multiple longitudinal modes in the gain microcavity, and the doped film contains doped ions. The mode-locked laser is integrated on a chip to reduce the volume and power consumption of the mode-locked laser, so as to solve the problems of large volume, large power consumption and complex assembly of the mode-locked laser in the prior art.

The invention discloses an ultra-wideband high-gain vortex optical fiber with a composite structure and a preparation method of the ultra-wideband high-gain vortex optical fiber. The optical fiber sequentially comprises a passive fiber core, an active inner ring core, an active outer ring core and a cladding from inside to outside. The passive fiber core is an optical material or an air hole which is not doped with active ions; the active inner ring core and the active outer ring core are made of laser materials doped with different rare earth light-emitting ions, and different light-emitting wave bands correspond to different rare earth light-emitting ion combination modes, for example, the blue light wave band is Tb-Tm, the red light wave band is Eu-Sm, the 1-micron wave band is Nd-Yb, the 1.5-micron wave band is Er-Tm, the 2-micron wave band is Tm-Ho, and the 3-micron wave band is Er-Ho or Er-Dy. According to the structure composite vortex optical fiber, rare earth light-emitting ions are doped in a partitioned mode, the unnecessary energy transfer process can be effectively avoided, the light-emitting efficiency of the optical fiber is improved, the light-emitting bandwidth of the optical fiber is increased, and the structure composite vortex optical fiber is applied to a high-performance vortex optical fiber laser and a broadband orbital angular momentum multiplexing system.

A circularly polarized antenna comprises an antenna part and a feed part which are stacked up and down, the antenna part is arranged on a first substrate, and the antenna part comprises a first antenna unit which comprises a cross-shaped metal patch and a top layer arranged on the first substrate; the parasitic element forms a square with four disconnected edges by four metal strips and is arranged on the middle layer of the first substrate; the second antenna unit comprises a square metal patch which is arranged on the bottom layer of the first substrate; the feed part is arranged on the second substrate, and the feed part comprises a coupling slot arranged on the top layer of the second substrate; the matching microstrip line is arranged on the middle layer of the second substrate; the feed-in line is arranged on the bottom layer of the second substrate; the branch line coupler is arranged on the bottom layer of the second substrate, the matching microstrip line is electrically connected between the feed-in line and the branch line coupler through a via hole, the thickness of the substrate is increased through the layer changing technology, the achievable impedance range is increased, impedance matching is achieved, the gain bandwidth, the axial ratio bandwidth and the return loss bandwidth are increased, and the antenna performance is optimized.

The present invention discloses an optical comb frequency control system and method for an optically generated ultra-stable microwave source, comprising: at least one optical comb signal frequency adjustment loop, the loop comprising an optical frequency comb, a phase detector, a phase difference extraction circuit and a PID circuit; the output end of the optical frequency comb is electrically connected to the input end of the phase detector, one input end of the phase detector is also connected to a reference signal, the output end of the phase detector is electrically connected to the input end of the phase difference extraction circuit, the output end of the phase difference extraction circuit is electrically connected to the input end of the PID circuit, and the output end of the PID circuit is electrically connected to the input end of the optical frequency comb. The present invention can realize an optical comb frequency control system with a larger phase detection range, lower bottom noise and higher gain bandwidth.

The present invention discloses a structurally composite ultra-wideband high-gain vortex optical fiber and a preparation method thereof. The optical fiber includes a passive core, an active inner ring core, an active outer ring core and a cladding from the inside to the outside. The passive core is an optical material or pore that is not doped with activated ions; the active inner ring core and the outer ring core are laser materials doped with different rare earth luminescent ions, and different luminescent bands correspond to different rare earth luminescent ion combinations, such as Tb-Tm for the blue light band, Eu-Sm for the red light band, Nd-Yb for the 1 μm band, Er-Tm for the 1.5 μm band, Tm-Ho for the 2 μm band, and Er-Ho or Er-Dy for the 3 μm band. The structurally composite vortex optical fiber of the present invention partitions the rare earth luminescent ions, which can effectively avoid unnecessary energy transfer processes, improve the optical fiber luminescence efficiency, increase the optical fiber luminescence bandwidth, and is applied to high-performance vortex fiber lasers and broadband orbital angular momentum multiplexing systems.

The invention provides a transformer coupling type broadband low-noise amplifier which comprises an input matching circuit, an amplifying circuit, an output broadband circuit, an input negative feedback circuit and an output protection circuit, and the amplifier achieves the effects of expanding bandwidth and optimizing linearity and stability through the input negative feedback circuit. Input bandwidth expansion without extra noise is realized through input matching, an output pole of a radio frequency signal is regulated and controlled through an inductor in an output broadband circuit to improve gain bandwidth, and feedback optimization gain is realized by combining inductive coupling of a grid electrode and a drain electrode of an amplifier transistor. And the performance optimization of the low-noise amplifier is realized on the basis of reducing the circuit area.

The application discloses a Ka-band broadband low-noise amplifier and belongs to the technical field of electronic communication and integrated circuits. 11 The amplifier comprises an input matching network, a main amplification stage, an inter-stage matching network and a buffer stage which are sequentially connected. 11 The S 11 The -10dB bandwidth reaches 7.5GHz, the noise coefficient ranges from 5.9dB to 6.6dB and is only 0.2dB higher than the lowest noise coefficient; the active transistor of the main amplification stage and the buffer stage is grounded through a large resistance in the substrate by means of a body isolation technology so as to improve the gain of the amplifier, and the highest gain reaches 11.2dB; the drain of the active transistor M2 of the main amplification stage is connected to a power supply voltage VDD through a parallel peak load for improving the gain at low frequencies, and the inter-stage matching network is introduced to improve the -3dB bandwidth and realize a wideband spectrum response, and finally the -3dB bandwidth reaches 7.5GHz.

The application provides a transformer coupling type wideband low-noise amplifier, which comprises an input matching circuit, an amplification circuit, an output wideband circuit, an input negative feedback circuit and an output protection circuit. The amplifier realizes the effects of expanding bandwidth, optimizing linearity and stability through the input negative feedback circuit, realizes input bandwidth expansion without additional noise through input matching, controls and improves the gain bandwidth of the output pole of the radio frequency signal through the inductance in the output wideband circuit, and realizes feedback optimization gain by combining the inductive coupling of the gate and the drain level of the amplifier transistor. On the basis of reducing the circuit area, the performance optimization of the low-noise amplifier is realized.