20results about How to "Working frequency bandwidth" patented technology

The embodiment of the invention provides a phase shifter, an integrated transceiving channel and a phased array system. The phase shifter comprises a first phase shifting unit, a second phase shifting unit, a third phase shifting unit, a fourth phase shifting unit, a fifth phase shifting unit and a sixth phase shifting unit, wherein the first phase shifting unit, the third phase shifting unit, the fourth phase shifting unit and the sixth phase shifting unit adopt a low-pass and band-pass switching type phase shifter structure; the second phase shifting unit and the fifth phase shifting unit adopt a high-pass and low-pass switching type phase shifter structure; and the phase shifter is used for performing phase shifting on the received signal when the configured signal receiving and transmitting device is used for receiving the signal, and performing phase shifting on the transmitted signal when the signal receiving and transmitting device is used for transmitting the signal. The phase shifter can realize a relatively large phase shifting range and has a relatively wide working frequency band, so that the phase shifter can be multiplexed when phase shifting is carried out on a receiving signal and a transmitting signal, and the overall layout area of a transceiving chip can be saved.

The application provides a deep-water longitudinal vibration underwater acoustic transducer with an acoustic low-pass filter structure and belongs to the technical field of deep-water transducers. The problem that the electric-acoustic performance of the longitudinal vibration underwater acoustic transducer is greatly deteriorated after an oil-filled cavity is introduced is solved. The transducer comprises a front cover plate, a piezoelectric crystal stack, a rear cover plate, an oil-filled cavity, an oil-filled slit and a pressure-resistant shell, the front cover plate and the rear cover plate are connected with two ends of the piezoelectric crystal stack respectively, the front cover plate, the piezoelectric crystal stack and the rear cover plate are all installed in the pressure-resistant shell, the annular gap between the rear cover plate and the pressure-resistant shell is the oil-filled slit, the annular gap between the piezoelectric crystal stack and the pressure-resistant shell is the oil-filled cavity, and the bottom of the pressure-resistant shell is provided with an oil filling hole. The transducer is mainly used for longitudinal vibration underwater acoustic transducers with low-frequency broadband characteristics in underwater working environments.

The present invention belongs to the technical field of noise control, and discloses a sound insulation and vibration reduction structure, which includes a sound insulation unit, the sound insulation unit includes a sound insulation board, a first mass block and a plurality of second mass blocks, the sound insulation board includes a sound insulation board body and a frame connected to the sound insulation board body, the sound insulation board body and the frame form a receiving cavity for accommodating noise, the sound insulation board body is elastic, the first mass block and the plurality of second mass blocks are connected to the sound insulation board body, and the plurality of second mass blocks are arranged at intervals and evenly distributed around the first mass block. The sound insulation and vibration reduction structure provided by the present invention can broaden the working frequency band, can realize sound insulation and vibration reduction in a wide frequency range, can reduce the initial working frequency, has a simple structure, and has a wide range of applications.

The present invention discloses a compact high-power waveguide radial power distributor / synthesizer, the purpose of which is to solve the problems of narrow bandwidth, large lateral size, low power capacity, etc. of the existing power distributor / synthesizer. The present invention is composed of three parts, namely, a conical circular waveguide-coaxial waveguide transition structure, a coaxial waveguide-circumferential rectangular waveguide array transition structure, and a circular curved waveguide array, which are sequentially coaxially connected and arranged in a central rotational symmetric manner along the central axis. The conical circular waveguide-coaxial waveguide transition structure is composed of a circular waveguide, a conical circular waveguide-coaxial transition waveguide, and a coaxial waveguide; the coaxial waveguide-circumferential rectangular waveguide array transition structure is composed of N fan-shaped-rectangular waveguide transition sections arranged circumferentially around the central axis; the upper end of the coaxial waveguide-circumferential rectangular waveguide array transition structure is a section surrounded by N fans, and the lower end is a section surrounded by N rectangles. The circular curved waveguide array is composed of N curved waveguides. The present invention has a wide working frequency band, a small lateral size, and a power capacity of the order of GW.

The present invention relates to a rectangular frame-double-rod slow-wave structure, which belongs to a traveling wave tube amplifier device. The present invention comprises a rectangular shielding tube 1, a dielectric substrate 2, and a frame-rod slow-wave circuit; the frame-rod slow-wave circuit is a rectangular frame-double-rod slow-wave circuit, which is a pair of symmetrically distributed metal connecting rods connected between adjacent rectangular metal wire frames. The present invention can be directly cut and processed as a whole in the longitudinal and vertical directions using an electric spark wire, and the processing is simple, the integrity is good, the processing accuracy is high, the assembly is simple, and the accuracy is easy to ensure. The present invention uses a strip electron beam with the same electrical parameters to interact with the electromagnetic waves propagating in the slow-wave structure. Compared with the existing frame-rod slow-wave structure, it not only has a wider working frequency band, but also has a higher coupling impedance in the working frequency band, which can further improve the working bandwidth and output power of the traveling wave tube.

The invention belongs to the technical field of high-power microwave mode conversion, and discloses a high-power microwave coaxial TEM-circular waveguide TE11 mode converter which is characterized in that the high-power microwave coaxial TEM-circular waveguide TE11 mode converter is mainly composed of two circular waveguides, the circular waveguide 1 is nested in the circular waveguide 2 to form a coaxial structure, and the central axis is coaxial; two rectangular ports are formed in the side walls of the two sides of the circular waveguide 1 and serve as a coupling mechanism to achieve the energy coupling effect. And the tail end of the circular waveguide 2 is in transition connection with the circular waveguide 1. The invention realizes the conversion from a coaxial TEM mode to a circular waveguide TE11 mode, has the advantages of easy processing, high power capacity, and coaxial input and output ports, and has a wide application prospect in a high-power microwave system.

The invention belongs to the technical field of electromagnetic pulse suppressors, and particularly relates to a plasma-based coaxial S-waveband strong electromagnetic pulse suppressor which comprises an outer electrode, sealing windows, an inner electrode, a discharge electrode and a solder filling area, the sealing windows are installed on steps on the two sides of the outer electrode, an open hole is formed in the center of each sealing window, and the inner electrode is arranged in the open hole. The inner electrode is coaxially fixed in an open hole of the sealing window, the discharge electrode is welded on the outer electrode, filling gas is arranged in a sealed area enclosed by the outer electrode, the sealing window and the inner electrode, and a solder filling area is arranged between the outer electrode and the sealing window. The working frequency band of the coaxial plasma pulse suppressor is in the whole S wave band, and meanwhile, a dual impedance compensation structure is adopted on the suppressor shell, so that the insertion loss and the standing-wave ratio of the whole strong electromagnetic pulse suppressor are very small in a very wide broadband; and the broadband and low insertion loss indexes which are difficult to reach by the conventional waveguide type structure suppressor are obtained.

The invention belongs to the technical field of power generation, and particularly relates to a piezoelectric vibration energy collector based on a spring sliding block structure, the piezoelectric vibration energy collector comprises a base assembly, a spring sliding block assembly and a piezoelectric film, the spring sliding block assembly comprises a cantilever beam, the cantilever beam is fixed on the base assembly, a sliding block is arranged on the cantilever beam in a sliding mode, and the piezoelectric film is fixed on the sliding block. Two springs are symmetrically arranged on the two sides of the sliding block, one end of each spring is fixedly connected with the sliding block, the other end of each spring is fixedly connected with the base assembly, and the piezoelectric film is arranged on the lower surface of the cantilever beam. The excitation frequency within a certain range near the resonant frequency can be tracked through the spring sliding block assembly, in the tracking process, the sliding block slides on the cantilever beam in a reciprocating mode, then large-amplitude vibration of the cantilever beam is caused, large electric output of the piezoelectric film is caused, and the piezoelectric effect is achieved. Therefore, the device has the characteristics of high energy collection and output capability and wide working frequency band.

The invention relates to the technical field of renewable energy sources, and discloses a double-side clamping cantilever beam type energy collector and a use method.The upper end face and the lower end face of a cantilever beam are each provided with a piezoelectric body, a double-wafer multi-layer structure of a piezoelectric layer, a substrate layer and a piezoelectric layer is formed, and then a double-side clamping and fixing structure is adopted; when mechanical vibration exists in an external environment, the double-side clamping cantilever beam type energy collector induces the vibration and then enables inertia force to act on the piezoelectric body, so that the piezoelectric body is bent and deformed, and a charge signal which is in a certain proportion to the input acceleration is generated on the surface of the piezoelectric body based on the direct piezoelectric effect; and the working frequency band of the energy collector is further expanded.

The micro-vibration absorber comprises a metal shell fixed to a platform, main springs with the same natural vibration frequency in the vertical direction and the horizontal direction are fixedly arranged at the bottom of an inner cavity of the metal shell, and steel balls used for vibration reduction are fixedly arranged at the upper ends of the main springs; movable gaps are reserved between the outer sides of the steel ball and the main spring and the inner wall of the metal shell; a cover plate is fixedly arranged at an opening in the upper end of the metal shell, a moving space is reserved between the lower end of the cover plate and the steel ball, the metal shell is filled with damping liquid used for damping and makes contact with the cover plate, the steel ball and the main spring are both immersed in the damping liquid to achieve vibration absorption, and the limitation of the structural size of a traditional vibration absorber is broken through; the low-frequency micro-vibration absorber has the advantages that optical platform line spectrum vibration control is achieved, the multi-direction working capacity is achieved, the low-frequency micro-vibration absorber is small in size, multi-direction low-frequency micro-vibration control is achieved, and the micro-vibration problem of an optical platform and a high-end laboratory platform is solved.

The utility model provides a broadband laminated patch antenna and a phased antenna array, the antenna comprises dielectric substrates, a radiation patch and a parasitic patch, the parasitic patch and the radiation patch are laminated, and a plurality of layers of dielectric substrates are arranged between the parasitic patch and the radiation patch; and the edge of the parasitic patch sinks inwards to form symmetrically distributed grooves which are used for prolonging a surface current path. By designing the symmetrically distributed groove structures at the edge of the parasitic patch, the flow path of surface current is successfully prolonged, a longer electrical length is realized under a limited physical size, and the working frequency band of the antenna is obviously widened; meanwhile, the parasitic patch and the radiation patch are arranged in a stacked mode through multiple layers of dielectric substrates, a multi-resonance-point coupling mechanism is formed, and the bandwidth is improved.

The present invention is applicable to the field of wireless communication technology, and in particular, relates to a design method, system and related equipment for a high-gain lens antenna. The method simulates the antenna to obtain the working frequency band range of the antenna; a dielectric lens model is designed according to the working frequency band range, and the dielectric lens model is composed of a plurality of dielectric units that are fixed layer by layer from the inside to the outside. The parameters of each dielectric unit in the dielectric lens model are adjusted and optimized according to preset rules, so that the electromagnetic waves are focused on the focus of the dielectric lens model after passing through each dielectric unit; wherein the parameters include the dielectric thickness and dielectric constant of the dielectric unit; the dielectric lens is assembled with the antenna to obtain a lens antenna. Compared with the prior art, the present invention improves the dielectric thickness and dielectric constant of the dielectric lens to achieve the focusing effect of the electromagnetic waves, and the obtained lens antenna has better gain effect, wider working frequency band and lighter weight.

The application discloses a kind of based on waveguide structure's wideband 2-bits reconfigurable intelligent surface, which includes: waveguide structure and wideband 2-bits phase shift circuit, waveguide structure and wideband 2-bits phase shift circuit are connected by metal via hole;Waveguide structure includes metal patch, first dielectric substrate and second dielectric substrate;First dielectric substrate is connected with second dielectric substrate, and first dielectric substrate is above second dielectric substrate;Metal patch is located at the top of first dielectric substrate, and the upper surface of metal patch is etched with U-shaped groove, and wideband 2-bits phase shift circuit is located at the bottom of second dielectric substrate;Wideband 2-bits phase shift circuit includes PIN diode, microstrip transmission line and DC bias circuit;DC bias circuit and PIN diode are connected by microstrip transmission line, and DC bias circuit is used to control the connection state of PIN diode.The wideband 2-bits reconfigurable intelligent surface provided by the application has a wide working frequency band and high bit phase encoding characteristics.

The invention belongs to the technical field of antennas, and relates to a protection antenna based on a metasurface, which comprises a dielectric layer, a radiation layer arranged on the upper surface of the dielectric layer, a floor layer arranged on the lower surface of the dielectric layer and a feed assembly, the radiation layer comprises a plurality of radiation patches which are arranged in a rectangular array so as to form a metasurface of which the length direction is parallel or vertical to the length direction of the dielectric layer; a diode is arranged between any two adjacent radiation patches along the length direction or the width direction of the metasurface; when the metasurface receives a normal signal, the diode is in a cut-off state; when the metasurface receives electromagnetic attack, the diode is in a conducting state; and electromagnetic protection of the antenna is realized through state switching of the diodes. According to the invention, the advantages of wide working frequency band, high tolerance power, low insertion loss and high integration level can be realized at the same time.

This invention discloses a multi-stage, multi-segment differential broadband power divider based on a polyimide support bridge. The power divider includes a differential signal input unit, multiple differential signal output units, a multi-stage, multi-segment differential impedance transformation unit, and multiple polyimide support bridge structures. The differential signal input unit includes input differential pairs, and the differential signal output unit includes multiple output differential pairs symmetrically arranged about a center line. Multi-stage, multi-segment differential impedance transformation units are respectively arranged between the input differential pairs and each output differential pair. The differential impedance transformation sections are based on cascaded differential impedance transformation lines to achieve stepped differential impedance transformation. Thin-film resistors are placed at the connection points of adjacent differential impedance transformation sections to provide absorption and cancellation paths for signals reflected from the output ports. The polyimide support bridge structure achieves dielectric isolation between microstrip lines. This invention, through optimized design and integration processes, possesses advantages such as small size, strong anti-interference capability, and large operating bandwidth.

The invention relates to a laminated broadband frequency reconfigurable electromagnetic complementary end-on-fire antenna based on a vanadium dioxide switch, and belongs to the technical field of antennas. The antenna comprises a first radiation main body, a second radiation main body, a third radiation main body, a vanadium dioxide switch, a strip line, a coaxial feed, a dielectric substrate I and a dielectric substrate II. The first radiation main body and the second radiation main body are equivalent electric dipoles, the third radiation main body is equivalent magnetic dipoles, and the electric dipoles and the magnetic dipoles form complementary antennas and jointly form directional radiation. And the current change of the third radiator is controlled through the working state of the vanadium dioxide switch, so that the frequency switching of the antenna between two frequency bands of 2.4 GHz and 5.8 GHz is realized. The antenna provided by the invention has the advantages of good radiation characteristic, low profile height and compact structure, the antenna frequency is controlled through the vanadium dioxide switch, an additional bias circuit is not needed, and the complexity of antenna design is reduced.

The invention discloses a terahertz broadband amplifier monolithic circuit which comprises an input matching network, the signal input end of the input matching network is the signal input end of the monolithic circuit, and the output end of the input matching network is connected with one input end of a first driving stage power amplification transistor. One output end of the first driving stage power amplification transistor is connected with the input end of the output stage power amplification transistor through the first inter-stage matching network, and the output end of the output stage power amplification transistor is connected with the input end of the output matching network. The output end of the output matching network is the signal output end of the single-chip circuit; and the input matching network, the output matching network and the inter-stage matching network comprise broadband tuning capacitors and are used for reducing the loss of the terahertz broadband amplifier and improving the gain and the output power of the broadband amplifier. According to the monolithic circuit, the complexity of a THz broadband amplifier monolithic integrated circuit can be reduced, the circuit design period is shortened, and the size of the monolithic circuit is reduced.

The present invention relates to the field of antenna technology, and discloses a liquid metal reconfigurable antenna and an antenna array. The liquid metal reconfigurable antenna comprises a first antenna tube and a second antenna tube that are interconnected, and a piston and a piston rod are arranged in each antenna tube. The piston rod can drive the piston to move along the axial direction of the antenna tube, and the first antenna tube and the second antenna tube are filled with liquid metal. The present invention drives the piston to move along the axial direction of the antenna tube by moving the piston rod, changes the liquid level of the liquid metal in the first antenna tube and the second antenna tube, and realizes the continuous reconstruction of the reconfigurable antenna shape. At the same time, the cross-sectional area of ​​the second antenna tube is larger than the cross-sectional area of ​​the first antenna tube, so the liquid level of the first antenna tube changes more significantly, and the antenna shape can be precisely controlled, which greatly broadens the working frequency band of the antenna. The reconfigurable antenna is sealed at both ends to avoid leakage of liquid metal when tilted, and increase environmental adaptability.

The application discloses an injection locking frequency multiplication device, a phase-locked loop and a method, which integrates a digitalized capacitance array in a resonant cavity of an injection locking frequency multiplier, and combines a frequency multiplication amplitude detection module and a feedback control module to form a closed-loop adaptive tuning structure, so that the equivalent capacitance and the resonant frequency of the resonant cavity can be adjusted in real time according to the amplitude change of a frequency multiplication signal, thereby effectively compensating for frequency drift caused by process deviation, power voltage fluctuation and temperature change, significantly widening the working frequency band of the injection locking frequency multiplier, improving locking accuracy and working stability, avoiding the phase noise deterioration and power consumption increase phenomenon caused by reducing the Q value of the resonant cavity or increasing the injection power to widen the locking range in the traditional scheme, enabling the frequency multiplier to realize wide frequency working and automatic calibration while maintaining good spectral purity and low phase noise, and being more suitable for a phase-locked loop and a radio frequency front-end circuit in a multi-frequency band and wideband communication system.

The present invention proposes a common-source common-base amplifier based on SiGe-BiCMOS process, including an input matching unit, a first-stage differential common-source common-base unit, a second-stage differential common-source common-base unit, a third-stage differential common-source common-base unit, a fourth-stage differential common-source common-base unit, and an output impedance matching unit; compared with a low-noise amplifier with a four-stage single-ended structure, it has better anti-noise capability and can obtain higher gain at a lower frequency; compared with a low-noise amplifier with a five-stage differential structure, it has stronger stability. The present invention adopts MOS transistors at the input stage, which obtains a lower noise coefficient at a higher frequency compared with HBT transistors; the input stage adopts a composite transistor structure to improve the power gain of the circuit; the common-source common-base structure adopted by the present invention reduces the Miller effect of the device and effectively expands the working frequency band.