15 results about "Standing wave" patented technology

The invention discloses a phased-array antenna active standing wave automatic testing device which comprises a computer, a vector network analyzer and a multichannel matrix switch. The multichannel matrix switch is connected with an antenna array to be tested. The switching time of a matrix switch and the data acquisition time of the vector network analyzer are configured to be synchronous. The vector network analyzer is configured to test and store the standing wave coefficients of respective antenna elements in the antenna array and the mutual coupling coefficients between the elements. According to the active standing wave computational formula of the antenna elements in the phased array, an automatic computation program is written. After the standing wave coefficients and mutual coupling coefficients of the antenna elements in the entire antenna array are tested, the active standing wave parameters of respective antenna elements are calculated and output, and then the test is completed. The invention also discloses a method for automatically testing the active standing wave of a phased-array antenna. The automatic test shortens the active standing wave test time of the phased-array antenna, reduces labor cost, improves test work efficiency, and reduces test cost.

The invention discloses a microstrip waveguide converter for a radar level meter, relating to the technical field of microwave. The converter can directly convert a microstrip signal into a waveguidesignal, and adopts a probe structure with an advantageous insertion loss to improve the insertion loss and standing wave index of the microwave signal from the PCB to the horn antenna transmission stage, thereby improving the sensitivity and detection range of the level meter. At the same time, the installation is realized all by screws, which reduces the assembly difficulty, eliminates the assembly of semi-steel coaxial cables in a narrow space, and improves the production efficiency.

The invention discloses a spectrum analyzer with a standing wave measuring function and a standing wave measuring method thereof. The spectrum analyzer comprises a full reflection curve generation module, a constant reflection curve generation module, a standing wave measuring curve generation module and a calculation module. The full reflection curve generation module is used for generating a full reflection measuring track curve according to a full reflection instruction input by a user and transmitting the curve to a displayer for display. The constant reflection curve generation module is used for generating a constant reflection measuring track curve according to a normal reflection instruction input by the user and transmit the curve to the displayer for display. The standing wave measuring curve generation module is used for conducting difference calculation on the full reflection measuring track curve and the constant reflection measuring track curve, generating the standing wave measuring track curve and transmitting the standing wave measuring track curve to the displayer for display. The calculation module is used for calculating standing wave measuring data with assigned frequency and displaying the standing wave measuring data in the displayer. The spectrum analyzer enables measuring results to be audio-visual and improves measuring efficiency and accuracy.

The invention discloses a fixed standing-wave ratio (SWR) mismatch load, including outer conductors, inner conductor, a microstrip sheet and an end cap, the outer conductor is a tubular part, the inner conductor is mounted and fixed in the inner hole of the outer conductor, the rear end of the inner conductor is provided with a blind hole, the blind hole is adapted to the front end of the pin, theend cap is detachably connected with the outer conductor, the substrate of the microstrip sheet is an alumina ceramic substrate, the alumina ceramic substrate is coated with a thin film resistor. Theinvention has the advantages that mismatched loads with different standing wave ratios can be obtained by changing the square resistance of the thin film resistor, the working frequency range of themismatched loads can reach DC - 50GHz, and the standing wave flatness of the mismatched loads is higher than that of the prior art. The size of the structure is small, and the length is reduced by about half compared with the mismatch load using the column resistor, which greatly reduces the size of the structure. In addition, the adjusting screw can be not used or used for debugging, so that thedebugging is easier.

A conductor arrangement includes a conductor that extends along a conductor axis. The conductor arrangement also includes a standing wave trap to which the conductor is coupled in order to damp standing waves that are excited by an RF field from outside the conductor arrangement. The standing wave trap is in the form of a dielectric resonator device.

The invention discloses an ultra-wideband four-ridge horn antenna capable of adjusting the diameter of a back cavity. The antennacomprises a horn, a ridge waveguide, a reflecting back plate, a radio frequency connector and a pair of adjusting screws capable of adjusting the distance, wherein one end of the ridge waveguide is connected with the reflecting back plate; and the pair of adjusting screws penetrate into the reflecting back plate and then extend into a back cavity formed by the reflecting back plate and the ridge waveguide to be in short-circuit contact with the pair of ridge sheets of the ridge waveguide. In order to avoid the port difference caused by the up-and-down dislocation of two radio frequency connectors, the pair of adjusting screws are additionally arranged at the bottom of the back cavity, the design difficulty of the ultra-wideband four-ridge horn antenna can be greatly reduced, the method is a novel back cavity design method, and the ridged horn antenna can obtain good port standing waves and good port consistency in an ultra-wideband.

The invention discloses an acoustic coupling structure of an in-ear earphone cavity. The in-ear earphone comprises an earphone shell, a coupling cavity is formed in the side wall of the sound conduitof the earphone shell, the coupling cavity is located at the end, away from the silica gel sleeve of the in-ear earphone, of the sound conduit, a pressure relief through hole is further formed in theside wall of the earphone shell, and a damping piece is arranged on the inner side of the pressure relief through hole. Based on the Helmholtz resonance principle, the coupling cavity with a low quality factor (Q value) is formed in the inner wall of the sound conduit, and the high-Q-value resonance peak of 5-6 kHz is counteracted through reversed-phase resonance; the pressure relief through holeis formed in the side wall of the front cavity of the earphone shell; high-pass filtering is carried out in a pressure relief mode, the filtering cut-off frequency can be changed by adjusting the pupil sectional area, the damping piece is attached to the pupil sectional area to reduce the Q value and control the bass SPL, the structure plays a role in high-pass filtering, reflection of high pitchon the inner wall is remarkably reduced, standing waves are eliminated, and high-frequency resonance peaks under a pressure field are further reduced.

There is provided an abnormality detection device and a fixing structure which are suitable for detecting an abnormality of a fastener such as a bolt or a nut. An abnormality detection device detects an abnormality of a fixing structure including a bolt, a nut, and a washer which include a conductor and fix steel plates to each other, and a spacer which includes an insulator and is disposed between the steel plates and the washer, the abnormality detection device including: a transmission antenna that radiates electromagnetic waves to the fixing structure; a reception antenna that receives electromagnetic waves reflected by the fixing structure; and an abnormality detector that changes a frequency of the electromagnetic waves radiated from the transmission antenna to acquire frequency characteristics of standing waves received by the reception antenna and detects an abnormality of the fixing structure by comparing the frequency characteristics with frequency characteristics in a normal state.

The invention provides a portable GPS Beidou antenna measurement recorder. The portable GPS Beidou antenna measurement recorder comprises a control module, a signal analysis module, a tuner module, asignal source module, a bar code scanning module, a storage module, a time recording module, a display module and a key module, wherein the signal analysis module, the tuner module, the signal sourcemodule, the bar code scanning module, the storage module, the time recording module, the display module and the key module are all connected with the control module, and the tuner module, the signal source module and the signal analysis module are connected in sequence. The portable GPS Beidou antenna measurement recorder provided by the invention has the advantages that the standing wave of an active antenna, the longitude and latitude, the signal-to-noise ratio and the number of receiving satellites by one key, a result can be obtained in real time by field measurement, the operation is convenient, simple and easy to master, and the maintenance efficiency is favorably improved.

The invention relates to a large-area self-tracing grating preparation method based on a scanning atom photoetching technology. The method is characterized by comprising the following steps of: preparing a local self-tracing grating structure on a substrate by adopting interaction of an atomic beam and a laser convergence standing wave field based on the atom photoetching technology; and using a Dove prism for controlling the laser convergence standing wave field to scan the deposition area in the direction perpendicular to the grating groove, and achieving global coverage of the self-traceability grating in the deposition area step by step, so as to form the large-area self-tracing grating. Compared with the prior art, the method overcomes the problems of grating edge coarsening and the like caused by reduction of the convergence energy density, and has the advantages of simplicity and convenience in operation and large grating area expansion space.

The invention discloses a stepping ultrasonic motor and a control method thereof. The stepping ultrasonic motor comprises a motor shaft, a motor base, a stator, a rotor and a preloading device for applying pre-pressure to the rotor, wherein the motor base, the stator, the rotor and the preloading device successively sleeve the motor shaft. The motor shaft is rotationally connected to the motor base and is fixedly connected to the preloading device. The stator includes an elastic body and a piezoelectric ceramic piece disposed on the lower surface of the elastic body and used for exciting standing-wave vibration. At least two electrodes are disposed on the lower surface of the piezoelectric ceramic piece. The rotor is provided with at least one contact tooth, and is in contact with the upper surface of the elastic body through the contact tooth. Since the electrodes are controlled to be energized in different ways, the step angle of the rotor is reduced. Since the motor shaft successively passes through the motor base, the stator, the rotor, and the preloading device, the stepping ultrasonic motor has not only high stepping precision but also high torque output performance.

The invention discloses a reflection-free coplanar waveguide band-stop filter and relates to a filter. The band-stop filter comprises a dielectric substrate (1), a metal layer (11), a coplanar waveguide (2) and a plurality of resonant slot rings (3), wherein the coplanar waveguide (2) is located on the metal layer (11) at one side of the dielectric substrate (1); on grounding plates (22) of the coplanar waveguide (2), the plurality of resonant slot rings (3) form absorption regions (4); the central frequency of a stop band of the filter can be adjusted through changing the resonant frequency of the resonant slot rings (3); and the space (31), parallel to the transmission direction of the coplanar waveguide (2), between the adjacent resonant slot rings (3) is greater than the outer diameterof an outer slot strip ring of each resonant slot ring (3) to avoid transmission of energy in the absorption regions (4) along the transmission direction of the coplanar waveguide (2). The band-stopfilter is capable of absorbing a band-stop signal and reducing the standing wave of the stop band, thereby improving the performance of a system.