7results about How to "Increased Gain Bandwidth" patented technology

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 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.

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 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.