288 results about "Directional coupling" patented technology

The invention relates to the technical field of radio frequency generator circuits, and provides a phase-locking frequency-stabilizing multi-core control radio frequency system, which processes I / Q signals and constructs a multi-core task allocation and cooperation mechanism through a digital baseband processing module, and performs pre-distortion processing and system scheduling. The double-closed-loop control module is used for stabilizing fundamental frequency, correcting temperature drift and compensating and adjusting frequency swing amplitude; the hybrid power amplification module is used for performing multi-stage hybrid power amplification signal processing and temperature monitoring through a driving stage and output stage combined topology; and the feedback sampling network module collects output signals in real time through a directional coupler and feeds back, adjusts and precisely controls the frequency stability according to the output signals.

The utility model provides a directional coupler and a radio frequency chip, and relates to the technical field of electronic communication. The directional coupler comprises an input port, an output port, a coupling port, an isolation port and an impedance adjusting network, the impedance adjusting network comprises an access switch, an impedance adjusting module and an inductance unit. The impedance adjusting module comprises an adjustable resistor unit and an adjustable capacitor unit which are connected in parallel; one end of the impedance adjusting module is connected to the isolation port through the access switch, and the other end of the impedance adjusting module is connected to the inductance unit; wherein the inductance unit is used for compensating parasitic capacitance in the directional coupler. According to the scheme, the impedance matching and phase characteristics of the directional coupler can be adjusted according to different working frequencies and environmental conditions through mutual cooperation of the access switch, the impedance adjusting module and the inductance unit, so that the directional coupler can maintain good directivity under various working conditions.

The invention discloses a broadband dual-circularly-polarized low-cost phased-array antenna array element, which comprises an antenna radiation structure and a slot feed structure which are arranged independently from each other, and is characterized in that the antenna radiation structure comprises a parasitic radiation layer, a first dielectric substrate, an excitation radiation layer and a second dielectric substrate which are arranged in a laminated manner; the slot feed structure comprises a slot layer, a third dielectric substrate, a strip-shaped transmission line and a fourth dielectric substrate; the antenna layer structure and the slot feed structure realize electromagnetic coupling transmission through the slot layer; a hollow symmetrical structure is arranged in the middle of the first dielectric substrate, and the hollow part is used as an air medium to reduce dielectric loss; the gap layer is provided with a multidirectional coupling gap structure; the strip-shaped transmission line is provided with at least two feed ports, and dual circularly polarized radiation is formed in the antenna layer structure through excitation of different feed ports. The antenna radiation layer has no metal through hole or blind hole, can be processed in a layered manner, has the advantages of low processing cost and high yield, and ensures impedance bandwidth while realizing dual circular polarization.

The invention provides a heterogeneous integrated sub-wavelength structure end face coupler adaptive to a single-mode optical fiber and a preparation method of the heterogeneous integrated sub-wavelength structure end face coupler, and relates to the technical field of integrated optics. The coupler comprises a substrate, an insulating layer, a waveguide layer and a cladding from bottom to top. The waveguide layer comprises an upper lithium niobate ridge waveguide and a lower lithium niobate ridge waveguide, the lower waveguide is wider than the upper waveguide, and the upper waveguide is used for connecting an external waveguide; the heterogeneous integrated coupling region comprises a silicon nitride strip conical waveguide which forms directional coupling with the lower-layer lithium niobate waveguide, so that adiabatic transfer of a light field is realized; the sub-wavelength grating regulation and control region sequentially comprises a silicon nitride tapered waveguide and sub-wavelength grating combination section, a width gradually-changing grating section and an equal-width buffer grating section. The whole structure is symmetrical about the central axis. Through the multi-section adiabatic transformation and heterogeneous integration design, efficient expansion of a mode field is achieved, the coupling efficiency with a single-mode fiber is improved, and the advantages of being insensitive to polarization, good in process compatibility and suitable for high-density integration are achieved.

The invention relates to a phase shift Bragg grating structure wavelength division multiplexer based on a barium titanate platform, and belongs to the technical field of optoelectronic integration. The device comprises a directional coupler, a multi-mode power divider, an unequal-width waveguide and a phase-shift Bragg grating, and pi / 2 phase difference is introduced to an upper arm and a lower arm through the unequal-width waveguide, so that reflected light of the phase-shift Bragg grating is converted into a TEmode; coupling the reflected TEmode to a subordinate device by using a directional coupler, and outputting transmission light in the TEmode; the transmission / reflection wavelength (the single-channel bandwidth is 0.5 nm) is changed by adjusting the grating period, and more than 10 multiplexing channels can be expanded through cascade connection. The limitation that a traditional phase shift grating only transmits output is broken through, a reflecting end multiplexing function is added, TE / TE dual-mode operation is supported, and the phase shift grating has the advantages of independent and controllable channels, low loss and flexible and adjustable wavelength, is suitable for optical communication, optical calculation and high-density optical interconnection systems, and is compatible with various material platforms such as barium titanate, lithium niobate and SOI (Silicon On Insulator).

Provided is a radio transmitter test system that enables accurate measurement of reflected wave power of an antenna. A radio transmitter test system includes: a power amplifier that amplifies power of a high-frequency signal from a signal generator; a simulative antenna for which a voltage standing wave ratio is variable and that is connected to a coaxial cable in place of an antenna; a directional coupler that is connected between the power amplifier and the simulative antenna, couples the high-frequency signal to the simulative antenna, and outputs traveling wave power and reflected wave power between the power amplifier and the simulative antenna; a power meter connected downstream of the directional coupler; and a control device, wherein the control device calculates, for each voltage standing wave ratio of the simulative antenna, a correlation coefficient indicating a correlation between traveling wave power and reflected wave power of the simulative antenna and traveling wave power and reflected wave power measured by the power meter, and calculates reflected wave power of the antenna by correcting, with the correlation coefficient, the traveling wave power and the reflected wave power measured by the power meter in a state where the simulative antenna is replaced by the antenna.

The invention relates to the technical field of coupler design, in particular to a bi-directional coupler applied to a high-frequency RFID (Radio Frequency Identification Device) system, which comprises the following steps: S1, respectively constructing a series transformer, a parallel transformer and a Magic-T structure hybrid network, and forming an impedance self-matching coupler core framework by adopting a plurality of Ni-Zn ferrite double-hole magnetic rings; s2, inputting an original coupling signal output by the coupler core architecture into a phase-amplitude cooperative calibration module to generate a calibrated stable coupling signal; s3, inputting the stable coupling signal into a bridging T-type attenuation network group, respectively performing accurate power adjustment on a forward coupling path and a reverse coupling path, and finally outputting a high-directivity and low-fluctuation coupling signal; s4, monitoring the impedance state of an antenna port in real time, and feeding back and adjusting a matching network structure to realize stable control of the standing-wave ratio in a full frequency band range; according to the invention, the design of an external matching circuit is simplified, the coupling efficiency and directivity are improved, and the method has important engineering value.

Configurations for a light splitting device used for light splitting over an operating bandwidth of wavelengths are disclosed. The light splitting device may include a first coupler and a second coupler, where the first coupler has a first splitting power relationship and the second coupler has a second splitting power relationship and the first and second splitting power relationships are complementary to one another over the operating bandwidth of wavelengths. The light splitting device may further include a phase delay positioned between the first and second couplers. The phase delay may result in the output light having an approximately even optical power distribution across the operating bandwidth of wavelengths. In some embodiments, the first and second couplers may be directional couplers and, in other embodiments, the first and second couplers may be tapered couplers.

An example device includes a first primary coil, a second primary coil, a combined power output, a first directional coupler output, a second directional coupler output. The example device also includes a secondary coil coupled to the combined power output, configured to magnetically couple to the first primary coil, and configured to magnetically couple to the second primary coil. The example device further includes a tertiary coil configured to magnetically couple to the secondary coil and including a first end coupled to the first directional coupler output, and a second end coupled to the second directional coupler output.

The invention relates to an automatic switching device for antennas of train dispatching main and standby stations and an implementation method. The device comprises a radio frequency interface, a radio frequency switch, a directional coupler, a detector, a microcontroller and an LED indicating lamp, the radio frequency interface I is connected with an antenna, the radio frequency interface II and the radio frequency interface III are respectively connected with a main station platform and a standby station platform, and the radio frequency switch realizes automatic switching between the antenna and the main station platform and the standby station platform under the control of the microcontroller. The directional coupler and the detector are used for collecting forward and reverse power of a transmitted signal, and the microcontroller calculates a standing-wave ratio according to detection voltage and performs threshold judgment. The method comprises the steps that after the device is powered on, the default antenna is communicated with the master station, and when it is detected that standby station transmitting signals meet a threshold, the standby station is automatically switched to; and if the signals of the standby station are insufficient, the master station is kept working, and indication and alarm are carried out through an LED. The device realizes rapid and automatic switching between the main station and the standby station, reduces the communication interruption time, and effectively improves the reliability and the operation and maintenance automation level of a communication system.

A method for determining information specifying an RF transmit power associated with an RF transmitter comprises controlling the RF transmitter to generate a set of RF signals, each RF signal having a frequency value from a set of frequency values; transmitting each RF signal of the set of RF signals to an input port of a directional coupler, the directional coupler having, in addition to the input port, an output port, a forward port, and a reverse port, the directional coupler being configured to couple a first part of a signal received at the input port to the forward port, and the directional coupler being configured to couple a second part of a signal received at the output port to the reverse port; and determining, for each RF signal of the set of RF signals transmitted to the directional coupler, measurement information.which specify a signal power measured at the reverse terminal and / or a signal power measured at the forward terminal in order to generate a set of measured values, and the determination of information that specifies the transmitted power based on the set of measured values.

Multibeam base station antennas include an antenna array that includes a plurality of columns of radiating elements and a beamforming network having at least two rows and two columns of directional couplers, where adjacent pairs of directional couplers in each row are connected to each other by respective ones of a plurality of delay lines, where at least some of the delay lines have a wave shape having multiple peaks and valleys.

A ground-penetrating radar (GPR) scanner for investigating a sub-surface, wherein the GPR scanner comprises an antenna assembly configured for transmitting and receiving ultra-wide band (UWB) signals. The GPR scanner further comprises a directional coupler, a UWB signal generator configured for providing outgoing UWB signals through the directional coupler to the antenna assembly, a UWB signal sampling unit configured for receiving incoming UWB signals from the antenna assembly through the directional coupler, and an impedance. The directional coupler is configured as a balanced UWB directional coupler. It comprises a first port configured for receiving positive outgoing UWB signals from the UWB signal generator and a second port configured for receiving negative outgoing UWB signals from the UWB signal generator, wherein the second port is balanced with the first port.

An exemplary device includes a first primary coil, a second primary coil, a combined power output, a first directional coupler output, and a second directional coupler output. The exemplary device also includes a secondary coil coupled to the combined power output, configured for magnetic coupling with the first primary coil and configured for magnetic coupling with the second primary coil. The exemplary device further includes a tertiary coil configured for magnetic coupling with the secondary coil, comprising a first end coupled to the first directional coupler output and a second end coupled to the second directional coupler output.

A system and method for continuous glucose monitoring (CGM) of blood in a blood vessel of a patient using a non-invasive sensor composed of a patch antenna operating in the Industrial, Scientific and Medical (ISM) Radio band (5.725 GHz-5.875 GHz). The device determines the blood glucose concentration of the blood in the blood vessel based on the measured shift of the resonant frequency of the non-invasive antenna patch sensor. A radio frequency (RF) synthesizer is used to drive the patch antenna with a fraction of its output coupled to both the antenna and receiver through a directional coupler. In this approach both the transmitted (FWD) and received (REV) power are processed, by demodulating logarithmic amplifiers, which convert the RF signals to corresponding voltages for downstream processing. The resulting voltages are then fed into a microcontroller and the measured shift in resonant frequency is converted to a real-time glucose concentration.

Embodiments of a system include a first transceiver, a first directional coupler, a first antenna, a second directional coupler, a second antenna, a second transceiver, a third transceiver, and a third directional coupler. The first directional coupler is connected to the first transceiver. The first antenna is connected to the first directional coupler. The second antenna is connected to the second directional coupler. The second transceiver is connected to the second directional coupler. The third transceiver has an antenna port. The third directional coupler is connected to the antenna port of the third transceiver and the other directional couplers. The first directional coupler, the second directional coupler, and the third directional coupler are configured to reduce interference that is incurred between the antenna port of the third transceiver and the first and the second transceivers.

This invention proposes a random microwave pulse generation system and method based on an optoelectronic oscillator, belonging to the field of microwave photonic signal generation and processing technology. The system includes a laser, a polarization controller, a closed-loop optoelectronic oscillator (OEO) loop, a random fiber grating string, and a function generator; wherein the closed-loop optoelectronic oscillator (OEO) loop mainly consists of a Mach-Zehnder modulator, a circulator, an erbium-doped fiber amplifier, a photodetector, an electrical amplifier, and a directional coupler.

The utility model provides a linear frequency modulation transmit-receive assembly with a silence function, which relates to the technical field of signal processing, and comprises a transmitting link, a receiving link and an auxiliary signal processing module, a voltage-controlled oscillator circuit of the transmitting link generates a microwave signal, and finally an isolator circuit transmits the signal. Signal processing and controllable silence of a transmitting path are ensured; and the receiving link carries out front-end processing on the received signal and carries out frequency mixing on the received signal and the local oscillator signal distributed by the directional coupler circuit to generate a beat signal, and the beat signal is further amplified by the intermediate frequency amplifier and then output. According to the utility model, silent signals are received through the enabling ends of the first power conversion chip A1 and the second power conversion chip A2, and power supply of the coupler circuit and the attenuator circuit of the transmitting link is directly cut off, so that compared with a traditional signal path cut-off mode, signal leakage or residual radiation can be thoroughly avoided, and the transmission efficiency is improved. The transmitting terminal is ensured to completely stop working in a silent state, and the requirement of a high-concealment scene is met.

A compact feed system (600) is provided which comprises an orthomode transducer or junction (400) and a waveguide H-plane directional coupler (100). The waveguide H-plane directional coupler may comprise two hollow waveguide sections (110, 120) and a coupling section (130) arranged in between the two hollow waveguide sections for coupling a signal from one hollow waveguide section to another hollow waveguide section. In a transverse cross-section of the waveguide H-plane directional coupler, the hollow waveguide sections may be angled towards the coupling section and delimit a recess (20) formed at an inner side of the waveguide H-plane directional coupler. The orthomode transducer or junction (400) may be positioned at least partially in the recess to increase compactness of the feed system.

The application discloses a modulation-insensitive dual-mode waveguide optical switch and a preparation method thereof, and belongs to the technical field of planar optical waveguide devices. The switch is composed of a silicon wafer substrate, a polymer lower cladding layer, a polymer optical waveguide core layer and a polymer upper cladding layer from bottom to top, the polymer optical waveguide core layer is covered in the polymer upper cladding layer, and the refractive index of the polymer optical waveguide core layer is higher than that of the polymer upper cladding layer and the polymer lower cladding layer. The application utilizes the advantages of simple asymmetric directional coupling structure and asymmetric Y branch structure and the large thermal-optical coefficient of organic polymer materials, and realizes the modulation-insensitive switch of two signal optical modes through mode conversion by using the asymmetric Y branch when the heating electrode is modulated. The preparation process of the application is simple, only needs spin coating, photoetching and wet etching, effectively reduces the production cost, improves the production efficiency of the device, is favorable for large-scale batch production, and enables the mode signal optical switch to be applied to actual use.

The invention refers to a method for coupling of waveguides, providing simultaneous interfacing and polarization and mode conversion between waveguides supporting modes and polarization states with similar or substantially different characteristics, and to a chip (100) comprising a converter structure, and to such converter structure. The invention merges functionalities of mode spot size conversion, mode coupling and transfer, mode type conversion, polarization conversion and polarization splitting. The converter structure is based on vertically stacked waveguides forming a vertical directional coupler (1) connected with different polarization branches (8) integrated into the chip (100).

The invention discloses an anti-interference radio frequency transceiving assembly which comprises a plurality of B1 low-noise amplification units, a B1 array antenna, a plurality of B3 low-noise amplification units, a B3 down-converter, a BDS B1 / GPS L1 down-converter, a first frequency synthesizer, a second frequency synthesizer, a crosslinking equipment digital signal processing board, a BDS B1 / GPS L1 up-converter, a B3 up-converter, a B2B low-noise amplifier unit and an S low-noise amplification unit. And the first triplexer is in data connection with the L power amplifier unit, the B2B, S and L three-in-one antenna array, the first directional coupler and the first logarithmic detector. According to the invention, electromagnetic wave signals of multiple paths of B3 and multiple paths of BDS B1 / GPS L1 are converted into electric signals, and the signals are filtered and amplified, so that amplitude-phase consistency is satisfied. And performing up-conversion on the analog intermediate frequency signal processed by the cross-linked digital signal processing board to output BDS B3 and BDS B1 / GPS L1 radio frequency signals. And the short message integrated service digital network can be realized.

The invention provides a single-input digital pre-distortion design method, medium and system for an impedance mismatch power amplifier, and the method comprises the steps: obtaining a plurality of output signals and a double-input memory polynomial model of the power amplifier in a complex impedance mismatch environment, and enabling the output signals and input signals to form a data set; introducing a neural network model into the double-input memory polynomial model to obtain a single-input fusion model; and training the single-input fusion model by using each output signal in the data set so that the single-input fusion model learns towards the direction of the input signal to obtain solved overall model parameters and internal parameters, and then performing pre-distortion control. According to the invention, the single directional coupler is used for collecting the output signal for solving the unknown parameter, and then the single-input fusion model containing the known parameter is used for predistortion control, so that the hardware overhead can be reduced, and the control effect is improved as the output signal is most accurate.

A directional coupler of present invention includes a waveguide, a substrate, two first slits, and two second slits. The substrate is having a strip line and ground layers opposed to each other at a side surface of the waveguide. The two first slits are provided in the side surface of the waveguide along a propagation direction of an electromagnetic waves in the waveguide, and the two second slits are provided in the first ground layer of the substrate opposed to the two first slits.

The present invention relates to a frequency steered phased array antenna which adjusts beam radiation angle according to frequency for broadband electromagnetic waves, and radiates beams of uniform intensity over a broad range of angles including directly forward. The frequency steered phased array antenna according to the present invention comprises: a directional coupler including a serial feed line that is stacked in n layers and has a plurality of coupling holes formed in one direction in each of the layers; and a radiating module including n horn antennas respectively connected in correspondence to the n layers of the serial feed line, wherein the plurality of coupling holes are formed in each of the layers of the serial feed line at intervals of ¼ of the wavelength (λ) of electromagnetic waves (radio waves) supplied to the serial feed line, and the horn antennas radiate the electromagnetic waves output through the coupling holes of the serial feed line.

The application provides a broadband symmetrical amplitude equalization directional coupler and a coupling method, relates to the technical field of microwave radio frequency passive devices, and comprises the following parts: a single-section coupling line located in an input through branch, the single-section coupling line being a double-layer metal biased wide-side coupling line; a symmetrical amplitude equalizer connected to a coupling port and an isolation port respectively; and an LC matching network connected to an input port and an output port respectively, so that the directional coupler suitable for 18-50GHz can be constructed, and strong coupling of the directional coupler is realized.

A circuit for measuring the reflection coefficient and a method for testing and calibration are proposed. The measurement circuit consists of two cascaded orthogonal directional couplers, with the through-terminal and coupling terminals of the two couplers connected to the same reactive element. Measuring the voltage between the through-terminal and coupling terminals under short-circuit conditions allows for calibration of the reflection coefficient of the reactive element. Based on the measured voltages between the through-terminal and coupling terminals of the two orthogonal directional couplers, a system of two nonlinear equations can be constructed. Solving this system yields the real and imaginary parts of the reflection coefficient of the load under test.

A vector network analyzer convenient to expand comprises a case, an excitation source, a first switch, a directional coupler, a measurement receiver, a reference receiver and a second switch. The first switch comprises an input end connected with an excitation source and a plurality of output ends, and part of the output ends are connected with an external excitation interface. The number of the directional couplers is multiple, the directional couplers are respectively connected with the other part of output ends of the first switch, and each directional coupler is also respectively connected with a port. The number of the measurement receivers and the number of the reference receivers are both multiple. The output end of the second switch is connected with the measurement receiver or the reference receiver, the second switch comprises two input ends, one input end is connected with the directional coupler, and the other input end of the second switch connected with the measurement receiver is connected with a measurement receiving interface; and the other input end of the second switch connected with the reference receiver is connected with a reference receiving interface. According to the utility model, the port expansion can be carried out while the built-in port can be used.

The invention provides a slope power division directional coupler which comprises a first input port, a second input port, a first output port and a second output port, the first input port is connected with the first output port through a first strip line, the second input port is connected with the second output port through a second strip line, and the first output port is connected with the second output port through a second strip line. Parallel coupling lines are configured on the first strip line and the second strip line, the coupling gaps of the coupling lines of the slope power division directional coupler adopt waveform function curves to replace linear gaps, the working frequency band can be broadened, the standing-wave ratio can be effectively reduced, the isolation degree of the directional coupler of an antenna can be greatly improved, and the antenna performance can be improved. And the high-isolation communication requirement is met. Meanwhile, the power ratio of the two output ports of the slope power division directional coupler has a large slope, the power ratio changes greatly along with the frequency, the horizontal wave width of the antenna can be converged, and the coverage energy efficiency of the antenna is improved.

The invention provides a GIS ultrahigh frequency online monitoring device and method based on signal multiplexing, and relates to the technical field of power grids. The online monitoring device is designed, the ultrahigh-frequency sensors are arranged on the inner walls of the GIS air chambers, the non-contact directional couplers are arranged on the outer walls of the GIS air chambers, ultrahigh-frequency signal transmission is achieved through coupling of the non-contact directional couplers and the ultrahigh-frequency sensors, and partial discharge detection can be achieved without perforating the GIS air chambers. The local detection box is arranged on the ground of the area where each GIS air chamber is located, and the multi-channel intelligent switching matrix in the local detection box is connected with the non-contact directional coupler of each GIS air chamber, so that polling switching detection of partial discharge in each GIS air chamber is realized, and operation and maintenance personnel do not need to climb to work; the problem of low GIS partial discharge detection efficiency caused by single-channel serial operation, high-altitude operation dependence and the like in the GIS partial discharge detection technology is solved, and the detection efficiency of GIS partial discharge detection is improved.