30results about How to "Improve selection features" patented technology

The invention discloses a preparation method for anti-dielectric substrate delamination of a multi-layer FSS radome. Before the radome is laminated, the polyimide frequency selective surface is plasma activated and the cyanate resin is sprayed for viscosity-increasing treatment; Quantitatively describe the influence of curing process parameters on the internal stress, establish the relationship model between the internal stress of the multilayer frequency selective surface stealth radome and the curing process parameters, and then make the polyimide frequency selective surface into prepreg; select according to the multilayer frequency The circuit design of the surface stealth radome requires the frequency selective surface and the layup sequence design of the composite material dielectric layer, and the layup is carried out according to the layup sequence; after the layup is completed, the autoclave is formed and cured. The invention makes up for the defect that air bubbles are easily trapped when the polyimide frequency selective surface and the dielectric layer prepreg are laminated in the traditional method, and solves the problem that the air bubbles cannot be excluded due to the barrier of the frequency selective surface when the dielectric layer is formed, and separation will occur. layer problem.

The invention belongs to the technical field of balance filters, and discloses a high-selectivity wide-stopband balance filter based on a slot line. The high-selectivity wide-stopband balance filter comprises a microstrip, a dielectric substrate and a conductive layer which are arranged successively. A slot line is etched on the conductive layer to form a passband selection module and a stopband suppression module. The passband selection module comprises two open ring resonators symmetrically arranged in a horizontal direction. The coupling end of one open ring resonator serves as the signal feed-in end of the passband selection module. The coupling end of the other open ring resonator serves as the signal feed-out end of the passband selection module. The stopband suppression module comprises two slot line [pi]-type networks symmetrically arranged in the vertical direction, wherein one slot line [pi]-type network is connected to the signal feed-in end of the passband selection module,and the other slot line [pi]-type network is connected to the signal feed-out end of the passband selection module. The high-selectivity wide-stopband balance filter achieves a wide stopband and highpassband selectivity by using a second-order resonant circuit composed of the slot line [pi]-type networks and the two slot line open ring resonators.

The present invention proposes a filter power divider based on half-mode substrate integrated waveguide, which takes the substrate integrated waveguide rectangular cavity and the half-mode substrate integrated waveguide rectangular cavity as the basic resonant unit, and the adjacent rectangular cavities are realized by opening windows Magnetic coupling, open S-shaped slots to realize electrical coupling, there is a jumper isolation resistor between the openings of the second-order half-mode substrate integrated waveguide rectangular cavity, slot lines are set at the corresponding positions between the metal conductive layer on the lower surface and the opening, and the input and output terminals use Microstrip-coplanar waveguide structure. The substrate-integrated waveguide rectangular cavity includes a dielectric substrate whose upper and lower surfaces are covered with metal conductive layers, and the dielectric substrate is evenly distributed along the edge of the cavity with metal through holes penetrating the upper and lower metal conductive layers; the half-mode substrate integrated waveguide rectangular cavity consists of The substrate-integrated waveguide rectangular cavity is obtained by dividing along the magnetic wall. The invention has a compact structure and improves the isolation characteristic and out-of-band suppression performance of the filter power divider.

The invention discloses a three-band monopole antenna, which comprises a substrate, a first floor, a second floor, an antenna feeder and a radiation patch located on the same surface of the substrate. flush, the other end is connected to the radiation patch, the first floor and the second floor are symmetrically distributed with respect to the antenna feeder and the lower edges of the first floor and the second floor are flush with the lower edge of the substrate, the first floor and the second floor are aligned with the There is a coupling gap between the antenna feeders; the radiation patch includes thick branches and thin branches. The thick branches are in a semi-circular structure, and the thin branches are in an open ring structure, and the opening of the ring is bent and folded several times to form a circular ring. It is an arc structure of concentric circles, the thick branches are embedded in the ring structure of the thin branches and the two ends are connected with the opening ends of the rings of the thin branches. The three-band monopole antenna has the characteristics of novel and compact structure, small volume, high space utilization rate, etc., and can be used in communication frequency bands such as GSM, WLAN, and WiMAX.

The invention relates to a current double-loop control method of an active power filter based on a mixed load. The control method is based on a mixed-load active power filter system current double-loop control system and an equivalent model of a harmonic amplification phenomenon established by the system. The method includes Compensation current outer loop control and damping inner loop control, harmonic current controller adopts proportional vector resonant controller, fundamental wave current controller adopts proportional resonant controller, DC voltage controller adopts proportional integral controller, damping inner loop adopts proportional Control mode, the invention can well compensate the harmonics of the harmonic amplification phenomenon caused by the hybrid nonlinear load, and at the same time suppress the resonance problem of the LCL filter, ensure the harmonic compensation effect of the APF, and enhance the stability of the system , and the harmonic compensation and DC side voltage regulation of the APF can be independently controlled.

The invention belongs to the field of photoelectric detectors and specifically relates to a single root twin structure GaN nano wire-based ultraviolet light photoelectric detector and a preparation method therefor. The detector comprises an Si substrate, an SiO2 insulating layer, a single root twin structure GaN nano wire on the insulating layer and metal electrodes covering two ends of the singleroot twin structure GaN nano wire that are orderly arranged from bottom to top. The twin structure GaN nano wire in the ultraviolet light photoelectric detector is high in specific surface area, andseparation and rapid transport of photo-generated carriers can be effectively realized via a twin structure; high optical responsivity, external quantum efficiency and photoelectric current gains canbe achieved. More importantly, the ultraviolet light photoelectric detector is high in selectivity concerning ultraviolet light in a UV-A wave band. The ultraviolet light photoelectric detector is simple in manufacture technology, low in cost, high in sensitivity and stable in performance.

A millimeter waveband filter is provided with a resonator formed by a pair of electric wave half mirrors in a transmission line of a waveguide allowing electromagnetic waves in a predetermined frequency range of a millimeter waveband to propagate in a TE10 mode, and allows frequency components centering on the resonance frequency of the resonator to pass therethrough. A high-pass filter which has a transmission line reduced in size so as to have a cutoff frequency matching an upper limit of a lower rejection band of a filter passband is formed in a transmission line between the end of the waveguide and the electric wave half mirror, thereby increasing the attenuation of the lower rejection band.

The invention discloses a dual-band band rejection filter based on a defective microstrip structure and a defective ground structure, comprising: a dielectric substrate (1), a metal-coated grounding plate (2) arranged on the bottom surface of the dielectric substrate (1), and a The metal microstrip line (3) on the substrate (1), the ground plate (2) and the microstrip line (3) are all etched with δ-shaped defect structures. The present invention constitutes a dual-band band-stop filter by using a ground plate and a microstrip line etched with a δ-shaped defect structure, thereby effectively improving the selection characteristics of the dual-band band-stop filter; in addition, the dual-band band-stop filter of the present invention The center frequencies of the two stopbands can be independently adjusted by changing the lengths of the defect microstrip structure and the defect ground structure, and the two bandwidths can be independently adjusted by changing the gap widths of the defect microstrip structure and the defect ground structure.

The invention provides an ultra wide band bandpass filter with a notch property. The ultra wide band bandpass filter comprises a T-shaped stub-loaded resonator, a first open ring resonator, a second open ring resonator, an input feeder line and an output feeder line. The input feeder line and the output feeder line are connected at left and right sides of the T-shaped stub-loaded resonator and are in gap coupling with the T-shaped stub-loaded resonator. The first open ring resonator and the second open ring resonator are symmetrically arranged at the left and right sides of the T-shaped stub-loaded resonator and are in gap coupling with the left and right sides of the T-shaped stub-loaded resonator. Through adoption of the T-shaped stub-loaded resonator, the bandwidth of a passband can be controlled well, a zero point is respectively generated at two sides of the passband, and the selectivity of the passband is improved. Through adoption of the open ring resonators, a notch stopband is generated, a location of center frequency of the stopband can be adjusted conveniently, the zero point is respectively generated at two sides of the stopband, and the selectivity of the stopband is improved.

The invention discloses a millimeter-wave broadband band-pass filter based on a substrate integrated waveguide suitable for the 25-50 GHz frequency band, including a high-pass filter, a low-pass filter and a cascaded matching between the two in series circuit, the cut-off frequency of the high-pass filter is lower than the cut-off frequency of the low-pass filter, the high-pass filter is composed of a substrate integrated waveguide (1), the low-pass filter is composed of a compact microstrip resonant unit (2), cascaded The matching circuit is a two-section matching circuit (3). The millimeter-wave broadband bandpass filter of the present invention uses a substrate integrated waveguide and realizes the filtering function through a filter cascading method.

The invention discloses a microstrip aided and novel coupling network based planar CQ diplexer, which comprises a band-pass filter with symmetrical CQ structures at left and right and a new coupling network. The planar CQ diplexer proposed by the invention has a novel coupling network structure and can be widely used in the design of various types of duplexers. With the adoption of a filter with a compact CQ structure, it is possible not only to make a diplexer highly selective, but also to ensure good isolation. As the duplexer is designed with a microstrip structure, it is light in weight, low in cost, and suitable for industrial mass production. Therefore, the duplexer is advantageous for its simple structure, easy design, and low manufacturing cost.

The invention proposes a Ku-band ultra-narrowband microstrip bandpass filter. It includes a microstrip substrate, the reverse side of the microstrip substrate is used as a grounded metal plate, the first input / output port and the second input / output port are distributed on both sides of the microstrip substrate, and a first uniform transmission line unit is arranged on the front of the microstrip substrate , the second uniform transmission line unit, the first coupled feeder, the second coupled feeder, the third coupled feeder, the fourth coupled feeder, the first open branch, the second open branch, the first folded L-shaped structural unit, the second folded L-shaped Structural unit, rectangular structural unit, third open branch, fourth open branch. The invention has good passband selectivity, high out-of-band suppression, small size, light weight, planarization and low cost.

Integrated wave-guide multicavity-cascaded frequency selection surface on base plate in high performance can be utilized as frequency range multiplexer to apply to antenna in multiple frequencies in communication system of satellite, radar etc. Pressing multiplayer microwave plates produces the frequency selection surface. The said surface includes following parts: outer up and low metal surfaces,middle metal surfaces in multi-layer, and intermediate media layer for filling gap between metal surfaces; etching out'#'shaped slot in large size on outer up and low metal surfaces, and etching out'#'shaped slot in small size on middle metal surfaces in multi-layer with their central positions being coincided each other; finally, a series of metalized through holes with even interval surroundingeach slot unit are set up on laminated base plate so as to form integrated wave-guide cavity on base plate of traditional metal cavity. The invention raises selectivity characteristic greatly.

The invention discloses a three-screen dual-passband high-selectivity frequency selection surface and a design method thereof. The frequency selection surface comprises: a first metal patch layer, a first medium layer, a second metal patch layer, and a second medium layer and the third metal patch layer, and press them together in sequence; the first and third metal patch layers are composed of first and second square loops, the first square loop is larger than the second square loop, The two loops are nested, and there is a gap between them; the second metal patch layer is composed of third and four square loops, the third square loop is larger than the fourth square loop, the two loops are nested, and There is a gap between the two. The invention realizes high-order resonance by means of multi-screen cascading, accelerates sideband roll-off while ensuring low insertion loss, obtains multiple transmission zero points outside the passband through multi-loop resonance design, superimposes stopband bandwidth and improves suppression , so that the structure can obtain high selectivity characteristics, and can efficiently and accurately separate electromagnetic waves of different frequencies in complex environments.

This invented super thin single-side steep filter property frequency selection surface can be used in multiple frequency antennas of satellite, radar communication system as a frequency band multiplex machine, which is processed on a multi-layer chip with three-layers of metal faces and two dielectric layers formed by laminating two microwave plate layers, in which, the top and bottom metal surfaces are etched with periodic large square loop slots in the same size, another size of periodic small square loop slot coincident with the central position of the large one is etched on the middle metal side, two media layers are filled among the three metal surfaces, a serial metal through holes in even intervals around each of the slot unit on the laminated multi-layer chip to form a chip integrated waveguide cavity equivalent to traditional metal cavities.