140 results about "Radiofrequency microwave" patented technology

The invention discloses a multi-band filter S parameter testing method and system based on segmented scanning, and relates to the technical field of radio frequency microwave testing. The method comprises the following steps: controlling a digital channel board card to drive a radio frequency switch through an upper computer, expanding radio frequency ports of a vector network analyzer, and enabling the number of the radio frequency ports to be matched with that of filter ports to be tested; test channels are divided according to the number of filter ports and test requirements, a segmentation parameter table and calibration parameters are configured for each channel, the segmentation parameter table comprises sub-segment scanning parameters, and the number of sub-segment scanning points is adjusted according to passband and stopband characteristics; the vector network analyzer performs segmented scanning on each channel based on the parameters; and the upper computer obtains the S parameter curve from the vector network analyzer to complete the test. The method can improve the S parameter testing efficiency and precision of the multi-band filter, and is suitable for mass production testing.

The invention provides an electric tungsten fire needle tumor ablation system, and the system comprises an image navigation module which is used for integrating CT / MRI / ultrasonic images, constructing a three-dimensional tumor model in real time, tracking a target region through electromagnetic positioning, and dynamically calibrating a needle insertion path; the insulating tungsten fire needle execution module is used for adopting a high-density tungsten alloy needle body and a multi-axis mechanical arm to control multi-angle puncture; the energy output module is used for intelligently adjusting radio frequency / microwave power and releasing energy in a pulse mode; and the temperature control feedback module is used for monitoring the temperature in real time and automatically terminating overheating energy. According to the technical scheme, accurate, safe and effective ablation of tumors is achieved.

The present application discloses a phase shift circuit and a radio frequency microwave system. The phase shift circuit may comprise: a first node circuit, a second node circuit, and a first signal channel and a second signal channel coupled between the first node circuit and the second node circuit, wherein the first node circuit is configured to split an input signal so as to simultaneously output a first differential signal to the first signal channel and a second differential signal to the second signal channel; the first signal channel and the second signal channel are implemented on the basis of a differential circuit architecture, and are configured to respectively perform signal attenuation and / or quadrant transformation on the first differential signal and the second differential signal, so as to implement phase shift; the second node circuit is configured to synthesize a first phase-shifted signal output by the first signal channel and a second phase-shifted signal output by the second signal channel so as to obtain an output signal; and the phase difference between the output signal and the input signal is within the range of 0-360 degrees.

The invention relates to the technical field of radio frequency microwaves, in particular to a reconfigurable radio frequency MEMS attenuator based on an attenuation network, which comprises a plurality of attenuation units, the attenuation units are sequentially connected in series and mounted on a substrate, and the output ends of the attenuation units are provided with signal output lines; the attenuation unit is provided with a Y-type power divider, the input end of the Y-type power divider is connected with a signal input line, the output end of the Y-type power divider is connected with an attenuation circuit and a straight-through circuit in parallel, and the output ends of the attenuation circuit and the straight-through circuit are connected with the signal output line; and the attenuation network is arranged on the attenuation circuit. According to the invention, the parasitic effect can be inhibited and the reflection effect can be reduced.

The invention discloses a single-power-supply ultra-wideband temperature compensation low-noise amplifier circuit, and belongs to the technical field of radio frequency microwaves. The circuit is mainly composed of a pre-stage low-noise amplifier module, an inter-stage temperature compensation equalization module and a post-stage driving amplifier module. The temperature compensation equalizer module generates differential voltage related to temperature through a three-stage gallium arsenide diode temperature sensing unit, outputs a control signal through an enhanced FET differential amplification circuit, drives a voltage-controlled attenuation equalizer to dynamically adjust the attenuation amount of a radio frequency signal, and achieves gain stability in a frequency band. Through the collaborative design of a blocking capacitor and a divider resistor, the grid bias of an FET switch is strictly limited in a transconductance linear adjustment interval, and the interval covers 80% of the effective range of the threshold voltage of a gallium arsenide FET tube. The circuit is powered by a single power supply + 5V, stable work of each module is ensured through active bias and a power supply filter network, and the circuit is suitable for extreme temperature environments such as high-frequency communication and radar.

The invention belongs to the field of high-performance materials, and discloses a high-thermal-conductivity PBO fiber and a preparation method thereof, and the preparation method comprises the following steps: (1) preparing a PBO polymer solution with a conventional molecular weight; (2) preparing an ultra-high molecular weight PBO polymer solution; (3) mixing the two PBO polymer solutions in a double-screw extruder according to a certain proportion to obtain a PBO spinning solution; (4) preparing as-spun PBO fibers by adopting a dry-wet liquid crystal spinning process and a condensed state structure regulation and control means; and (5) washing, drying, oiling and winding the as-spun PBO fiber to obtain the high-thermal-conductivity PBO fiber. According to the method, a small amount of the ultra-high molecular weight PBO polymer is added into the conventional spinning solution, the heat conduction performance of the PBO fiber is remarkably improved through the induced orientation crystallization effect of an ultra-high molecular weight PBO long chain, and the method has good application prospects in the field of high-power radio frequency microwave circuits with high requirements for heat dissipation capacity.

The invention belongs to the technical field of radio frequency microwave functional components, and particularly relates to a pouring type integrated transformer, an internal matching component and a preparation method thereof, the pouring type integrated transformer comprises a microstrip impedance line of a multilayer spiral structure, a soft magnetic ferrite pouring body located outside the microstrip impedance line, and leading-out terminals arranged at the two ends of the microstrip impedance line; the micro-strip impedance line is arranged on a substrate with a certain dielectric constant requirement and forms a spiral structure along a set path, the micro-strip impedance line and the substrate of the micro-strip impedance line are coated with the soft magnetic ferrite pouring body, the soft magnetic ferrite pouring body is of an integrally formed structure, and the soft magnetic ferrite pouring body is obtained by mixing soft magnetic ferrite powder and a binder, pouring the mixture in a mold and carrying out curing demolding. Through the innovative structural design and preparation process, the technical bottlenecks of large size, low efficiency, inconsistency, difficulty in packaging and the like existing in a traditional manual winding matching mode are overcome, and a feasible technical scheme is provided for miniaturization, high performance and large-scale application of a power amplifier matching network in a radio frequency microwave system.

The invention discloses a broadband high-power transmitting and receiving circuit and device, and belongs to the field of radio frequency microwaves. When the circuit works in a transmitting state, a radio frequency signal enters from a transmitting input port, enters a power amplifier I and a power amplifier II through a bridge I, enters a bridge II after being amplified by the power amplifier I and the power amplifier II, and is transmitted to a power amplifier II; the load I and the load II are respectively connected to the isolation ends of the electric bridge I and the electric bridge II so as to ensure port impedance matching of the electric bridges; when the radio frequency signal is synthesized into the maximum power through the second bridge and then enters the straight-through port of the high-power coupler for power output, the high-power coupler is in an emission coupling state at the moment, the third load is connected to the output port of the emission coupling branch of the high-power coupler, and the coupled emission signal is absorbed by the third load. And the receiving link is an isolation end of the coupling branch. The problem of receiving and transmitting passive switching of the high-power receiving and transmitting assembly under the ultra wide band can be solved.

The application discloses a metal sheet integrated waveguide structure which is a full-metal structure and is formed by stacking at least three metal substrates arranged from bottom to top, wherein air cavities filled with air are formed on at least one internal metal substrate by cutting off parts, and the metal substrates are connected to form a self-encapsulated structure. The metal sheet integrated waveguide structure technology can generate a multi-layer self-encapsulated structure, and independent circuit design can be performed on each layer to realize high-performance radio frequency, microwave and terahertz electricity; the full-metal integrated platform can fully utilize the low-loss and high-Q characteristics of the metal structure, and can create a circuit structure with good electromagnetic shielding and excellent heat dissipation performance.

The invention discloses a radio frequency microwave frequency multiplier which comprises an input resonance filter network, an oscillation amplification network and an output resonance filter network, the oscillation amplification network is adopted as a core architecture, and high power and high gain in a microwave frequency band can be achieved. And meanwhile, the self-adaptive linearization feedback network is used for adjusting the linearity component of the stacked field effect transistors at the bottom layer of the self-bias negative feedback amplification network, so that the whole radio frequency microwave frequency multiplier obtains good high gain, high linearity and high power output capability.

The present application belongs to the technical field of radio frequency microwave integrated circuit design, and specifically relates to a wideband full duplex receiver sharing an interference cancellation circuit. The full duplex receiver of the present application is composed of a receiver module and an interference cancellation circuit. The receiver comprises a transconductance, a mixer, a transimpedance amplifier and a frequency conversion loop. The interference cancellation circuit comprises an input matching network, an input down-mixer, a quadrature selection phase shifter and a baseband variable gain low-pass filter. The interference cancellation circuit transfers the adjustment of the delay and gain in the radio frequency domain to the baseband, so that the overall area and power consumption are small, and the delay amount of 3.86-8.33 ns can be realized in a wide radio frequency band of 0.5-3.5 GHz. Meanwhile, the interference cancellation circuit is synthesized by the mixer in the frequency conversion loop of the receiver to form a double-path cancellation mode, which avoids the interference cancellation circuit being directly connected to the front end of the receiver module, and the noise figure deterioration of the receiver module is very small, only 0.9-1.2 dB.

A chronic and / or acute system and methods of minimally invasive ablation with wire structure devices dispensed through a needle without open cut downs or laparoscopy and using energy forms including radiofrequency, microwave and direct current.

The invention provides a radio frequency microwave power amplifier over-standing wave protection system and a protection method thereof. The system comprises a bidirectional coupling module, a dual-path detection module, a signal processing module and a protection execution module, wherein the bidirectional coupling module is used for collecting a forward radio frequency power analog signal and a reverse radio frequency power analog signal; the dual-path detection module is used for generating a forward detection voltage analog signal based on the forward radio frequency power analog signal and generating a reverse detection voltage analog signal based on the reverse radio frequency power analog signal; the signal processing module is used for generating an actual standing-wave ratio based on the forward detection voltage analog signal and the reverse detection voltage analog signal, and generating a control protection signal according to the actual standing-wave ratio; and the protection execution module is used for performing power-off protection on the to-be-protected radio frequency microwave power amplifier based on the control protection signal. The problem that an existing radio frequency microwave power amplifier over standing wave protection scheme cannot be suitable for complex application scenes can be solved.

This invention discloses a radio frequency millimeter-wave phase-to-voltage converter, belonging to the field of radio frequency microwave integrated circuit technology. The converter includes: a first and second frequency divider chain for dividing two input signals to achieve phase compression; a first and second quadrature generator for providing a -90° linearized bias; a three-state coupling network connected between the two frequency divider chains to eliminate phase mode ambiguity introduced by the frequency dividers through reconfigurable coupled phase; and a symmetrical phase detector for converting the linearized phase difference into a voltage signal output. This invention compresses the ±180° phase difference to a small angle range using phase compression technology, combined with linearized bias to allow the phase detector to operate in the linear region, and utilizes the three-state coupling network to achieve unambiguous detection across the entire 360° phase range. Implemented using a 40nm CMOS process, it requires no external clock, has no inductor design, a core area of ​​only 0.016mm², power consumption of 22mW, a response speed of 120ns, and a linearity of 1.05% FSR.

The invention relates to a manufacturing method of a power amplifier for improving power back-off efficiency, which belongs to the technical field of radio frequency microwave circuits, and comprises the following steps: step 1, based on load characteristics of an active device, determining an optimal efficiency impedance point under linear output power as optimal impedance of amplifier design; step 2, pulling out the determined optimal impedance by using a load pulling technology or LOADPULL, and drawing the optimal impedance on an SMITH original drawing; 3, based on the optimal impedance obtained through traction, low-loss impedance matching is achieved through the equal Q matching technology, loss and bandwidth are compatible, and impedance change and frequency band shaping are completed; 4, a two-stage or multi-stage amplification structure is adopted, and nonlinear compensation is realized by controlling grid voltages of front-stage and back-stage active devices and utilizing front-stage and back-stage gain compression and expansion characteristics; the method has the beneficial effects that the linear output power optimal efficiency impedance point is selected as the optimal impedance of the amplifier design, and the amplifier maintains higher linear output power and has higher rollback efficiency.

The invention discloses an ultra-wideband silicon-based phase shifter chip working at 0.2-2GHz, which is applied to the technical field of radio frequency microwave integrated circuits. The architecture of the chip consists of a fully differential amplifier, an orthogonal signal generator, a vector synthesis network and a digital-to-analog conversion control circuit. According to the chip, within the working frequency band of 0.2-2 GHz, the phase shifting precision can be 5.625 degrees, the phase shifting range can be 360 degrees, the phase RMS error is smaller than 2.7 degrees, the amplitude RMS error is smaller than 0.6 dB, the input and output return losses are smaller than 12 dB, the gain is larger than-0.5 dB, and the area of the chip is 0.88 mm < 2 >.

The application discloses a kind of through type radio frequency microwave vector analysis device and method, device includes radio frequency front end and down conversion module, digital acquisition and processing module and control and interactive module.Radio frequency front end and down conversion module are used for the transmission of radio frequency signal, two-way coupling sampling and coherent down conversion;Digital acquisition and processing module are used for collecting signal and processing, obtain pure incident wave signal and reflected wave signal;Control and interactive module are used for controlling each module, and carry out man-machine interaction.The application is realized by using through type measurement architecture, under the premise that the signal transmission of measured system is not interrupted, realizes the online vector analysis of radio frequency signal, and does not need built-in signal source, and then complete vector parameter such as reflection coefficient, impedance, standing wave ratio can be accurately calculated.

The invention discloses a method for automatically stabilizing the phase of a broadband radio frequency microwave channel, which belongs to the technical field of radio frequency microwave communication and comprises the following steps: acquiring stability characteristic data of the phase of the broadband radio frequency microwave channel; generating a phase stability index according to the stability characteristic data of the phase of the broadband radio frequency microwave channel; judging whether the phase of the broadband radio frequency microwave channel is stable or not according to the phase stability index; if the phase of the broadband radio frequency microwave channel is unstable, obtaining potential abnormal source feature data of the phase of the broadband radio frequency microwave channel, and generating an optimization decision target value; establishing an optimal optimization decision analysis model according to the optimization decision target value, and generating an optimal optimization decision; according to the optimal optimization decision, optimizing the potential abnormal source of the phase of the broadband radio frequency microwave channel; according to the invention, the phase stability and the system reliability of the broadband radio frequency microwave channel are obviously improved, and the optimal configuration of maintenance resources is realized at the same time.

The invention discloses a plasma auxiliary excitation method, a plasma generating device and a plasma generating system, an auxiliary excitation device is used for performing auxiliary excitation on a plasma torch, the auxiliary excitation device comprises an excitation source, a first electrode and a second electrode, and the first electrode and the second electrode are electrically connected with the two ends of the excitation source respectively; when the excitation source is switched on, the first electrode and the second electrode discharge to generate electric arc; discharge ends of the first electrode and the second electrode are arranged in a working gas inlet channel of the plasma torch or outside a torch flame nozzle. The device is suitable for various plasma torches with radio frequency / microwave energy feed-in, electric arcs or plasmas generated by discharging between the electrodes are used for assisting excitation to generate plasmas, and after the plasma torches are assisted to excite torch flames, even if the first electrode and the second electrode are disconnected with the excitation source, torch flame maintenance of the plasma torches is not affected.

The application discloses a liquid metal-based radio frequency coaxial cable connector, which comprises a Type-N male head at one end, a Type-N female head at the other end and liquid metal connecting the Type-N male head and the Type-N female head; the Type-N male head is fixed on a swing arm of a thrust measuring device, the Type-N female head is fixed on a base of the thrust measuring device, the liquid metal connects the Type-N male head and the Type-N female head and realizes radio frequency / microwave power transmission, and the Type-N male head rotates coaxially relative to the Type-N female head. By adopting the liquid metal bridging and zero stiffness coaxial cable connection mode, the influence of the coaxial cable on the torsional pendulum stiffness is significantly reduced, the torsional pendulum can more accurately measure the small thrust of an electric thruster, and the thrust measurement precision is improved; the liquid metal-based connector design realizes good impedance matching, ensures efficient transmission of radio frequency / microwave power, reduces the loss in the signal transmission process and improves the working efficiency of the electric thruster.

The application provides a radio frequency microwave amplifier for expanding modulation bandwidth, and relates to the technical field of radio frequency microwave circuits.The amplifier comprises an active device current source end face parasitic capacitor, a first inductor, a first capacitor, a video bandwidth expansion circuit, an output circuit and a target load; the first end of the first inductor is connected with the first end of the active device current source end face parasitic capacitor and the first end of the output circuit respectively, and the second end of the first inductor is connected with the first end of the first capacitor and the first end of the video bandwidth expansion circuit respectively; the second end of the output circuit is connected with the target load; and the second end of the first capacitor is grounded.The application can effectively break through the limitation of traditional radio frequency microwave amplifiers in modulation bandwidth, so that the amplifier can process modulation signals in a wider frequency range, and meet the demand of modern communication systems for high-speed and large-capacity data transmission.

The invention relates to the technical field of radio frequency microwave circuits, in particular to a broadband power divider adopting a multistage isolation network. Comprising an input port, an output port, an impedance matching network and an isolation matching network, the input port is connected with the impedance matching network, the output port is connected with the impedance matching network, and the impedance matching network is connected with the isolation matching network. The invention provides a highly flexible design frame. Through free combination of topological structures of the impedance matching network, the first isolation matching network and the second isolation matching network, the power divider with different center frequencies, different bandwidths and different isolation indexes can be conveniently realized, and the power divider has high expandability and wide engineering application value.

The application provides a microstrip antenna and TR assembly integrated structure and an integrated method, and belongs to the field of radio frequency microwave technology, comprising a TR assembly and a microstrip antenna, wherein the TR assembly comprises a box body, a multi-channel insulator pin connector is arranged on the antenna radio frequency interface end of the front end of the box body; the microstrip antenna is integrated on the antenna radio frequency interface end, the microstrip antenna is provided with radio frequency signal holes corresponding to the number and position of the insulator pin connector, the insulator pin connector passes through the radio frequency signal holes and is sintered together with the microstrip antenna. The microstrip antenna and TR assembly integrated structure provided by the application has the characteristics of thin section, small volume, light weight, easy conforming, easy realization of dual polarization and convenient integration design with the TR assembly; the microstrip antenna and the TR assembly are integrated into one, which can improve the signal receiving resolution performance of the radar product, reduce the size after the device connection, realize the miniaturization and light weight of the volume.

The utility model relates to the technical field of radio frequency microwave communication, and discloses a radio frequency microwave power synthesis device, which comprises an external power supply, an EMC (Electro Magnetic Compatibility) protection module and a power supply management module, the power management module is electrically connected with a signal preprocessing module, a power amplification module, an input coupling and detection module, a frequency selection switch matrix module, a reconfigurable filter network module, a dynamic power adjustment module, a phase matching module, a power synthesis module, an output coupling and detection module and an intelligent control module. According to the utility model, through cooperation of the dynamic power adjustment module, the phase matching module, the power amplification module and the power synthesis module, the power synthesis efficiency of the radio frequency microwave power synthesis device is improved, the power consumption is reduced, and the signal distortion is reduced; and high-efficiency power synthesis in a wide frequency band is realized.

The invention relates to the technical field of oil exploitation, in particular to a high-gas-liquid-ratio water content analyzer which comprises a measuring pipe, the measuring pipe is arranged in the horizontal direction, and the measuring pipe is provided with an oil inlet end and an oil outlet end; the detection bin is arranged outside the measuring tube in a sleeving manner, the detection bin and the measuring tube are coaxially arranged, and the measuring tube is communicated with the detection bin; the emitter is arranged in the measuring tube and is used for emitting radio frequency microwaves; and the detector is arranged below the emitter and is used for receiving the radio frequency microwaves emitted by the emitter. The water content analysis device has the effect of performing water content analysis under the condition of high gas-liquid ratio.

The invention relates to the technical field of radio frequency microwave circuits, and discloses a compact waveguide-microstrip duplexer which comprises a first rectangular waveguide, a second rectangular waveguide and a dielectric substrate circuit. The first rectangular waveguide forms an input channel of an electromagnetic wave signal. The second rectangular waveguide terminal is short-circuited. And the dielectric substrate is placed at a cross section position where waveguide ports of the first rectangular waveguide and the second rectangular waveguide are accurately and tightly butted. On a dielectric substrate located in an internal area of a rectangular waveguide, circuits with narrow-band frequency excitation coupling output characteristics for input signals are manufactured on the two faces of the substrate respectively, and band-pass filters with corresponding pass bands are manufactured on output band lines of excited signals. Two excitation signals of the duplexer penetrate out of the metal outer wall of the rectangular waveguide, and before the microstrip line serves as an output interface, the coupling and filtering integrated function of the input signals is achieved inside the input rectangular waveguide, and the duplexer has the advantage of being compact in overall circuit structure.

The present application relates to the field of radio frequency microwave, and particularly relates to a double-layer annular four-port network radio frequency microwave switch, comprising: a substrate, the substrate is a rectangular plate with double surfaces; a co-planar waveguide structure, the co-planar waveguide structure adopts a three-in-one design, comprising a signal line and ground lines on both sides of the signal line; the co-planar waveguide structure is symmetrically arranged at the center of each side of the substrate; the signal line branch is further provided with a Pad window, a Pad lead and an air bridge structure; an upper electrode, the upper electrode is fixed on the co-planar waveguide through an anchor point, and the upper electrode is a cantilever type straight plate structure containing an array of release holes; a Y-type power divider structure, the Y-type power divider structure is narrow-band cascaded with the co-planar waveguide structure, and is used for accurately distributing an input signal to multiple output channels; a power division port of the Y-type power divider structure is connected with the upper electrode through a double-contact structure; a cascaded through-hole, used for realizing cascaded operation of a double-layer double-pole double-throw switch, ensuring signal integrity and realizing efficient transmission.

The invention relates to the technical field of radio frequency microwave transmission lines, in particular to a radio frequency coaxial cable with high temperature phase stability and low loss and a preparation method thereof, comprising an inner conductor, a medium body, an outer conductor, an intermediate body, an outer shielding body and a sheath, the cross section of the dielectric body is of a lotus root core structure, the lotus root core structure comprises an inner conductor wrapping layer and an outer conductor supporting layer concentrically arranged on the outer side of the inner conductor wrapping layer, and the inner conductor wrapping layer and the outer conductor supporting layer are provided with a plurality of reinforcing ribs at equal angles along the center; and fan-shaped through holes are formed among the reinforcing ribs, the inner conductor wrapping layer and the outer conductor supporting layer. The problem that phase stability, transmission loss and mechanical phase of a radio frequency cable in the prior art cannot be considered at the same time is solved.

The application belongs to the technical field of radio frequency microwave circuits, and particularly discloses a two-path multi-stage power amplifier with high isolation and strong out-of-band suppression. The application comprises an improved filtering power distribution module and an improved filtering power synthesis module which are of the same structure but are reversely arranged, and a first multi-stage amplification module and a second multi-stage amplification module which are of the same structure; the first multi-stage amplification module comprises an input matching bias fusion module, a first transistor, a multi-frequency point matching bias fusion module, a second transistor, a multi-frequency point matching bias fusion module, a third transistor and an output matching bias fusion module which are connected in sequence. The application can effectively suppress out-of-band harmonics, realize high power output and high efficiency within a high frequency bandwidth, and effectively reduce the area of the overall circuit structure. The application can be widely applied to high-performance radio frequency front-end systems.

A phase-shifting circuit and a radio frequency microwave system are provided. The phase-shifting circuit includes a first node circuit, a second node circuit, and a first signal channel and a second signal channel coupled between the first node circuit and the second node circuit. The first node circuit is configured to split an input signal to simultaneously output a first differential signal to the first signal channel, and output a second differential signal to the second signal channel. The first signal channel and the second signal channel are implemented based on an architecture of a differential circuit, and configured to perform at least one of a signal attenuation and a quadrant transformation on the first differential signal and the second differential signal for phase-shifting. The second node circuit is configured to synthesize a first phase shift signal output by the first signal channel and a second phase shift signal output by the second signal channel to obtain an output signal, and a phase difference between the output signal and the input signal is within a range of 0 deg-360 deg.