17 results about "Planar filter" patented technology

The invention relates to an anti-interference high-selectivity omnidirectional planar filtering antenna, a filtering processing method and application, and the planar filtering antenna comprises a metal radiation layer, a first dielectric substrate, a first coupling layer, a second dielectric substrate and a second coupling layer which are sequentially stacked. The second dielectric substrate is provided with a plurality of metalized through holes which are distributed in an annular array mode and define a substrate integrated cavity with the first coupling layer and the second coupling layer, the metalized through holes divide the second coupling layer into an inner side patch and an outer side ring piece, and the inner side patch is evenly provided with a plurality of resonance grooves; and a feed probe penetrating and extending to the second dielectric substrate is arranged at the center of the bottom of the metal radiation layer. According to the invention, the substrate integrated waveguide technology is adopted, the substrate integrated cavity is formed, and a high-selectivity filtering effect is realized by utilizing the characteristic of high Q value, so that the interference of out-of-band signals is effectively inhibited, and the advantages of the patch antenna and the substrate integrated cavity are effectively combined.

A flow control valve for an irrigation system includes a planar filter screen upstream of an inlet to a metering passage and a scraper device mounted to automatically clean the screen when water is flowing into the metering passage.

The invention relates to a flat filter element (10) for filtering a fluid, in particular for filtering air, for a filter system (100), in particular for an air filter system of a fuel cell system, having an arrangement of at least two planar filter medium bodies (12, 32) which are arranged adjacent to one another in an axial direction (80), the filter medium bodies are arranged in an axial direction (80) such that a fluid can flow through one after the other. The filter medium bodies (12, 32) are surrounded on their respective outer circumferences (26, 46) by a common circumferential side band (70). A common side band (70) extends from the downstream filter medium body (32) in the axial direction (80) with a protruding section (72) towards the upstream filter medium body (12). The common side strip (70) is at least partially embedded in the circumferential casting element (20) on the most upstream filter medium body (12). The invention also relates to a filter system (100) and to the use of a flat filter-filter element (10).

The application discloses a heat pump air conditioning unit with multi-stage air purification function and relates to the technical field of heat pump air conditioning units. The heat pump air conditioning unit comprises an outer casing, an electric air outlet fan, a protective net, a flow expansion shell, a condenser, multi-stage filters and a compressor. A plurality of purification sheets of the application form a circular planar filter layer. Dust contained in air is filtered by filter screens on the purification sheets. After being filtered, the air does not have a large amount of dust adhering to the condenser when being blown through the condenser, so that the condenser remains clean during long-time operation and the heat dissipation efficiency is not reduced due to dust adhesion. The flow expansion shell is arranged to diffuse the air filtered by the multi-stage filters during room temperature adjustment, so that the entire condenser is cooled. The dispersed back-blowing air flow can be gathered and concentrated to blow towards the purification sheets during self-cleaning. The control system performs self-cleaning for a corresponding time length according to the filter screen blockage condition, so that the self-cleaning intensity is adaptively adjusted according to the blockage degree.

The invention belongs to the field of thin film microstrip filters, and particularly relates to a miniaturized ultra-wideband planar filter. According to the invention, the bridge employs a compact branch structure, the length and spacing of the branch are optimized according to the electromagnetic coupling characteristics of the 3.1-10.6 GHz frequency band, and the matching conditions of the characteristic impedance, the resonator and the dielectric substrate are strictly satisfied; the planar coupling path of the bridge is further combined with the three-dimensional coupling of the gold wire to form a'planar + three-dimensional 'composite coupling mechanism, and by matching with the miniaturized configuration of the microstrip resonator, the overall size of the device is reduced by more than 30%, the group delay is greatly reduced (from 0.68 ns traditionally to 0.33 ns at 8.3 GHz), the coupling value between the resonators is remarkably improved, and finally, the ultra-wideband coverage is realized. And in-band interference signals can be effectively suppressed. The problems that in the prior art, traditional bridge coupling only depends on a plane structure, the coupling path is single, coupling value improvement is limited, and bandwidth and miniaturization are difficult to consider at the same time are effectively solved.

The utility model discloses an oil unloading device with low failure rate, which comprises a coarse filter tank, an oil unloading pump and an oil unloading truck, and the coarse filter tank is arranged between the oil unloading truck and the oil unloading pump. According to the utility model, the double filter cavities and the detachable filter frame are arranged, so that the quick switching and off-line cleaning of the filter cavities are realized under the condition of no shutdown, the industrial pain point of oil path interruption caused by blockage of a single-cavity filter structure is solved, and the maintenance process of the filter unit is simplified through modular design; manual intervention frequency and high-temperature oil product contact risk are remarkably reduced, the impurity interception capacity is remarkably increased and oil flow impact is dispersed by optimizing the axial height of the columnar filter screen and the collaborative layout of the planar filter screen, and the problem of local rapid blockage of a traditional planar filter screen is avoided while high filtering precision is maintained; the impact of oil pressure fluctuation on the oil unloading pump is effectively relieved, the stable operation period of equipment is prolonged, and meanwhile the mechanical failure risk caused by frequent blockage is reduced.

The invention relates to a flat filter element (10) for filtering a fluid, in particular for filtering air, for a filter system (100), in particular for an air filter system of a fuel cell system, having an arrangement of at least two planar filter medium bodies (12, 32) which are arranged adjacent to one another in an axial direction (80), the filter medium bodies are arranged in an axial direction (80) such that a fluid can flow through one after the other. At least one of the filter medium bodies (32, 12) arranged closest to the downstream and at least one of the filter medium bodies (12, 32) arranged closest to the upstream are arranged radially in the circumferential frame element (50) at least in some regions in the axial direction (80). In this case, the downstream-most filter medium body (32) is connected to the frame element (50) by means of a downstream circumferential casting element (40) and the upstream-most filter medium body (12) is connected to the frame element (50) by means of a circumferential upstream casting element (20). The invention also relates to a filter system (100) and to the use of a flat filter-filter element (10).

This utility model discloses a microbial flocculant water treatment separation device, relating to the field of water treatment technology. It includes a fixing mechanism, with a microbial chamber mechanism rotatably mounted on the upper end of the fixing mechanism. A separation and processing mechanism is connected internally to the microbial chamber mechanism. This utility model solves the problems of current microbial flocculant water treatment separation devices where the filter screen is difficult to disassemble and clean, and the filtration effect of planar filter screens is limited. This utility model achieves layered filtration by setting up a separation and processing mechanism, where the lower filter screen, upper filter assembly, and cover plate are pressed together. The lower filter screen is designed with a cylindrical side plate and a hemispherical shape, maximizing the filtration area and improving filtration efficiency. The fixing mechanism drives the microbial chamber mechanism, with a fixed plate and a rotating drive cylinder, enabling tilt adjustment of the microbial chamber mechanism.

The application belongs to the field of thin film microstrip filter, and particularly relates to a miniaturized ultra-wideband planar filter. The application adopts a compact stub structure through an electric bridge, the stub length and interval are optimized according to the electromagnetic coupling characteristics of the 3.1-10.6 GHz frequency band, and the matching conditions of the characteristic impedance and the resonator and the dielectric substrate are strictly met; and further, the planar coupling path of the electric bridge is combined with the three-dimensional coupling of the gold wire to form a composite coupling mechanism of 'planar + three-dimensional', cooperating with the miniaturized configuration of the microstrip resonator, the overall size of the device is reduced by more than 30%, while the group delay is greatly reduced (from the traditional 0.68 ns to 0.33 ns @ 8.3 GHz), the coupling value between resonators is significantly improved, and finally the ultra-wideband coverage is realized, and the in-band interference signals can be effectively suppressed. The application effectively solves the problem in the prior art that the traditional electric bridge coupling only relies on the planar structure, the coupling path is single, the coupling value is limited, and it is difficult to balance the bandwidth and miniaturization.

The invention discloses a comb tooth type filtering dielectric resonator transmission array antenna, and belongs to the field of microwave communication. Grounding layers with upper and lower holes are introduced into the array unit to form an internal shielding cavity so as to integrate a planar filter circuit, and cross-layer signal feed is realized in combination with a vertically penetrating metal cylinder. Comb-shaped dielectric blocks and rectangular metal patches with L-shaped branches are symmetrically arranged outside the cavity to serve as radiation coupling structures, so that physical isolation and electrical decoupling of filtering, radiation and excitation functions are realized in a three-dimensional space. On the basis, through systematically presetting key dimension parameter combination of a multi-layer structure, on the premise of keeping high consistency of filtering response between units, series units with four fixed phase differences of 0 degree, 90 degrees, 180 degrees and 270 degrees are prepared in batches; and finally, the triple targets of high-selectivity filtering, accurate beam forming and high-yield manufacturing are synchronously realized on an array layer.

The invention relates to a filter accessory (10) for an extraction hob (100) and to a combination appliance (500) comprising the extraction hob and the filter accessory, the filter accessory (10) being adapted for being removably installed in a main air inlet opening (102) provided in a top plate (104) of the extraction hob (100), so that the filter accessory (10) at least partially protrudes above the top plate (104), the filter accessory (10) comprising: a cuboid filter housing (12) having four side walls (14) and a top wall (16) while being open at a bottom side, wherein the top wall (16) and / or at least one of the side walls (14) has an air inlet window (18), the filter accessory further comprising a filter assembly (20) accommodated in the filter housing (12), the filter assembly (20) having a planar filter surface portion (22) that is tilted with respect to the top wall (16) and to at least one of the side walls (14), and wherein the filter accessory (10) does not comprise an extraction fan installed in the filter housing (12).

This invention discloses a planar resonator and filter, belonging to the field of electronic communication technology. The planar resonator is fabricated on a circuit board and consists of two metal strips with lengths ranging from 1 / 4λ to 1 / 12λ: a first metal strip and a second metal strip arranged in parallel and interleaved configurations. One end of the first metal strip is connected to an upper metal ground strip, while the other end is left unconnected; one end of the second metal strip is connected to a lower metal ground strip, while the other end is left unconnected. Using this resonator to construct a planar bandpass filter reduces the inherent size of planar filters, achieving miniaturization. Furthermore, by introducing transmission zeros through cross-coupling between the resonators, frequency selectivity is improved, and a higher level of stopband suppression is achieved, meeting the needs of a wider range of applications. The proposed planar resonator and filter design can be implemented in microstrip circuits, stripline circuits, and suspended microstrip circuits, and is applicable to both broadband and narrowband filter designs, showing broad application prospects.

The present invention relates to a process water sampling immersion probe (10) comprising a filter module (20) comprising a flat filter screen (22, 23) and a sample suction opening (28) through which filtered sample water is pumped from the filter module (20) to an analyzer unit (80), and a rigid retention mechanism (90), the invention relates to a filter module (20) comprising a rigid holding mechanism (90) for holding the filter module (20), a swivel bearing arrangement (30) being provided, which defines a stationary axis of rotation (R) and connects the filter module (20) to the rigid holding mechanism (90) such that the filter module (20) can be rotated within a rotation sector (S) having a rotation angle of at least 10 DEG.

The invention relates to the field of filtering devices, in particular to a ventilation filtering device for civil air defense engineering and a using method thereof.The ventilation filtering device comprises a filtering shell, a motor is fixedly installed in one end of the filtering shell, the output end of the motor is fixedly connected with a ventilation fan, and an N-shaped filtering part is movably installed in the filtering shell. According to the air exchange filtering device for the civil air defense project, by arranging the N-shaped filtering part, the motor, the transmission assembly and other parts, firstly, the N-shaped filtering part is installed in the air exchange filtering device, a multi-layer filtering space can be formed, and compared with a single structure of a plane filtering plate, the contact area with air can be increased, and the air filtering effect can be improved; and under the cooperation of the motor and the transmission assembly, the second filter plate and the first filter plate are intermittently shaken, dust on the surfaces of the second filter plate and the first filter plate is shaken off, and the situation that filtered dust particles possibly penetrate through a filter screen through mechanical scraping cleaning is solved.

The invention relates to a method for producing a filter device (1) for filtering a hydrophilic liquid, having a planar filter element (10) which is permeable to the liquid, wherein the filter element (10) has a limited filter area (11) which is coated with a hydrophobic medium. The following steps are provided: a) providing the planar filter element (10), which in particular has a filter nonwoven (13) between a mesh support layer (14) and a spun-bond nonwoven (15), b) producing a ring-shaped, compressed boundary area (16) for the filter area (11), c) applying the medium to the filter area (11) of the filter element (10), (d) obtaining the filter device (1).

The utility model relates to the field of biological recognition, in particular to an iris lens and an iris recognition device. The iris lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object space to an image space along an optical axis, the first lens is a convex-concave double-face aspheric lens and comprises a first aspheric surface and a second aspheric surface, and the first lens is made of PC; an aperture stop; the second lens is a convex-concave double-sided aspheric lens and comprises a third aspheric surface and a fourth aspheric surface, and the third aspheric surface and the fourth aspheric surface are made of E48R; the parallel flat plate optical filter comprises a first flat plate surface and a second flat plate surface which are made of K9 glass; the total length of the iris lens is 3.376281 mm, the focal length of the iris lens is 2.041765 mm, and the F number of the iris lens is 2.099. The iris imaging device is small in size, convenient to carry, clear in imaging, uniform and bright in image, small in iris image deformation and excellent in imaging performance.

The present application relates to a kind of broadband tunable planar filter power divider, belong to radio frequency and microwave device field.The device includes microstrip line structure, dielectric substrate and metal ground.Microstrip line structure and metal ground are respectively arranged on the two surfaces of dielectric substrate.Microstrip line structure includes first port, second port, third port, first branch microstrip line structure and second branch microstrip line structure, wherein first port is connected with first branch microstrip line structure and second branch microstrip line structure respectively;Second port is connected with first branch microstrip line structure;Third port is connected with second branch microstrip line structure.The planar filter power divider also includes parallel circuit structure, and the parallel circuit structure is connected with microstrip line structure.The present application has the advantages such as low cost, wide applicability, low power loss, etc., and the present application has relatively wide frequency tuning bandwidth.