32 results about "Notch band" patented technology

The invention discloses a miniaturized ultra-wideband bandpass filter with a reconfigurable notch band, which includes a 50Ω microstrip line, a transition section from the microstrip line to a half-mode substrate integrated waveguide, a half-mode substrate integrated waveguide, three A half-wavelength slot resonator and three reconfigurable notch elements. The lowest passband frequency of the ultra-broadband bandpass filter of the present invention is determined by the width of the half-mode substrate integrated waveguide, and the highest passband frequency is determined by three half-wavelength slot resonators. Three reconfigurable notch units are used to couple with the transition section from the microstrip line to the half-mode substrate-integrated waveguide and the half-mode substrate-integrated waveguide to generate a notch band with reconfigurable frequency and bandwidth. By changing the DC bias voltage, the capacitance value of the varactor diode can be adjusted, thereby adjusting the frequency and bandwidth response of the notch band.

A notch filter appropriately adjusts the amount of attenuation at a center frequency of its notch band through changing or adjusting a value of an adjustable parameter A, and adaptively controls the amount of signal attenuation of a predetermined frequency component for an input signal that passes the notch filter, so as to partially suppress or partially attenuates the predetermined frequency component without affecting the size of a bandwidth of the notch filter.

The invention relates to a ghost wave suppression method based on frequency spectrum reconstruction. The ghost wave pressing method based on the frequency spectrum reconstruction is characterized by comprising the following steps that (1) original earthquake data are subjected to two-dimensional fourier transform, the earthquake data in f-k domain are obtained, the earthquake data in the f-k domain are subjected to inverse filtering of ghost wave by using a self-adaptive parameter estimation method, and trapped wave zone of the ghost wave is located; (2) according to the location in the step (1), frequency component other than result location of the inverse filtering of the ghost wave is used as effective value, iteration is carried out by using curvelet transform and convex set projectionalgorithm, and frequency spectrum in the trapped wave zone is reconstructed; and (3) the frequency spectrum after reconstruction is subjected to two-dimensional fourier transform, and is transformedto time-space domain, and a suppression result of the ghost wave is obtained. The ghost wave suppression method based on the frequency spectrum reconstruction can be widely used in the field of ghostwave pressing in the earthquake data.

The invention discloses an ultra-broadband antenna with a trapping function in the 6.7-7.1GHz frequency band, which includes a dielectric plate, a radiation patch is arranged on the top surface of the dielectric plate along the center line, and the radiation patch is connected with a feeder microstrip line. There are two symmetrical rectangular grooves along the center line in the radiation patch; a chamfered ground is provided on the back of the dielectric board. The ultra-broadband antenna with notch function of the present invention realizes the notch function through symmetrical rectangular slots on the rectangular radiation patch, realizes broadband matching through symmetrical cut corners on the rectangular ground, has a simple structure, and is easy to produce in batches. In practical applications Not only can realize the work of broadband, but also can realize the function of trapping the signal of Indian National Satellite Communication C-band 6.7‑7.1GHz to avoid electromagnetic interference.

The invention discloses a reconfigurable high-suppression dual-band band-stop filter, which is characterized in that it includes a 50Ω microstrip line, a class A notch unit and a class B notch unit, and the class A notch unit and the class B notch unit The wave unit is electrically coupled and connected to the 50Ω microstrip line, and the coupling distance is d1. Multiple notch units are distributed and coupled through 50Ω microstrip lines, with compact structure, small size and passband insertion loss. The frequency and bandwidth of the two notch bands of the reconfigurable high-suppression dual-band band-stop filter of the present invention can be adjusted independently, and the notch band has a high suppression degree and a large tuning range. At the same time, it provides an intelligent suppression solution for connecting the interference analysis unit of the communication system.

The present invention discloses an adaptive co-site disturbance suppression system and method capable of reducing the notch bandwidth. The co-site disturbance suppression system comprises a coupler 1, an orthogonal power divider 1, an orthogonal power divider 2, an adjustable attenuator 1, an adjustable attenuator 2, a correlator 1, a correlator 2, a detection unit 1, a detection unit 2, a controller, a synthesizer and a coupler 2. The adaptive control of calculating, determining, locking and releasing is carried out on the control amount of the adjustable attenuators via the detection units and the controller, so that the constant control amount of the adjustable attenuators can be realized, and accordingly, the attenuation of the co-site disturbance suppression system to the effective signals is avoided, and the notch bandwidth is reduced. The system can guarantee the situation that the received weak effective signals are not attenuated when offsetting the received interference signals, thereby guaranteeing the normal work of a receiver. The system has the bandwidth reduction effect, so that the system also can be used to reduce the transmitting-receiving frequency difference and improve the utilization rate of the spectrum resources.

The invention discloses a recombinant trapped wave frequency band ultra wide band-pass filter based on a cross resonator. The recombinant trapped wave frequency band ultra wide band-pass filter comprises a cross resonator, and parallel coupling feeder line structures, wherein three stub lines of the cross resonator are connected with capacitors to the ground. Micro band line design with distribution parameters is adopted. The recombinant trapped wave frequency band ultra wide band-pass filter has the advantages of light weight, small size, high reliability, excellent property, good temperature stability, large-scale production, low cost and the like, and is particularly applicable to ultra wide band communication systems, digital radar, single soldier satellite movement, military and civil multimode and multi-channel communication system terminals in different working environments, and corresponding systems with harsh requirements on weight, property and reliability.

A detection method of detecting a notch band (Notch-Band) is applied to a multi-carrier communication (Multi-Carrier) system. The multi-carrier communication system is operated at a broadband. The detection method comprises the following steps of receiving a receiving signal, and according to the receiving signal, generating a plurality of frequency domain signals; carrying out magnitude operationon the plurality of frequency domain signals so as to acquire a plurality of amplitude values; and according to a plurality of specific values of a first group of amplitude values in the plurality ofamplitude values relative to a second group of amplitude values in the plurality of amplitude values, determining whether the receiving signal possesses the notch band.

The invention provides an ultra-broadband antenna with notch reconfigurable function, which includes a dielectric plate, a circular radiation patch is arranged on the top surface of the dielectric plate along the longitudinal centerline, and a transverse opening is opened inside the radiation patch. In the rectangular slot, a pair of T-shaped parasitic microstrip lines are arranged symmetrically along both sides of the longitudinal direction, and the necks of the pair of T-shaped parasitic microstrip lines are provided with intervals for installing switches; in the rectangular slot, there is another pair of T-shaped parasitic microstrip line; there is a groove along the longitudinal end of the radiation patch, and a feed microstrip line is fixed in the groove, and there is a gap between the inner end of the feed microstrip line and both sides of the groove; in the medium The longitudinal side of the bottom surface of the plate is provided with rounded corners with circular cut corners. The antenna of the present invention controls the notch frequency band to be in three states of WiMAX, WLAN or no notch function by gating the T-shaped parasitic microstrip line, thereby saving resources and improving antenna use efficiency.

A method for detecting a notch band is applied to a multicarrier communication system that operates in a wideband. The method includes: receiving a received signal, and generating a plurality of frequency-domain signals according to the received signal; performing a magnitude operation on the frequency-domain signals to obtain a plurality of magnitude values; determining a plurality of ratios of a first magnitude set among the magnitude values to a second magnitude set among the magnitude value to determine whether the received signal contains a notch band.

The invention discloses a variable-frequency narrow-band interference suppression method for short-wave full-band reception. The input signal power is divided into two channels, and the full-band direct-sampling receiving branch and the broadband variable-frequency receiving branch are respectively used to receive and process the two input signals. The processing results of the two branches are input into the FPGA for fusion output; the invention realizes the short-wave full-frequency tunable narrow-band notch by combining the adjustable notch and the narrow-band notch technology, thereby realizing the suppression of the interference signal , has the characteristics of tunable notch frequency in the short-wave full frequency range, small notch bandwidth and large notch depth, and is easy to implement; the narrow-band crystal notch ensures the reception performance of the adjacent channel signal of the interference signal, and the frequency mixing The link cooperation enables the fixed frequency crystal notch filter to notch short-wave interference signals of any frequency, and through the data fusion in the FPGA, the narrow-band notch suppression of the interference signals is realized, and the interference signal removal is ensured. Good reception of shortwave signals outside the full frequency band.

The invention relates to a guide rail assembly, a guide rail, and a robot moving device, aiming at solving the technical problem that the current guide rail assembly is easily deformed during use. The guide rail assembly includes a base and a support plate arranged on the upper end of the base; The guide rail belt and the linear guide rail belt are arranged along the length direction of the base, and inwardly recessed groove belts are respectively arranged in the middle of the left and right side walls of the linear guide rail belt. And for the slider provided with an undercut, protrusions matching the grooves on the groove belt are respectively provided on the inner walls of both sides of the slider, the slider is buckled on the linear guide rail belt, and the two protrusions on the slider Respectively snap into the groove belts on both sides of the linear guide rail belt; the guide rail consists of two guide rail assemblies as described above; the robot moving device includes a robot and the above guide rails, and the base under the robot is fixed on the two guide rails on the two slides above the assembly.