66 results about "Dual band filter" patented technology

The invention discloses a differential dual-band filtering antenna. The differential dual-band filtering antenna comprises a first substrate, a first radiating unit, a first feeding line, a first dual-band filter, a second substrate, a second radiating unit, a second feeding line, a second dual-band filter, an H-shaped grounding plate and a director, wherein the first radiating unit, the first feeding line and the first dual-band filter are arranged on an upper surface of the first substrate, the first dual-band filter is inserted into the first feeding line, the second substrate is opposite to the first substrate, the second radiating unit, the second feeding line and the second dual-band filter are arranged on a lower surface of the second substrate, the second dual-band filter is inserted into the second feeding line, the H-shaped grounding plate and the director are arranged between a lower surface of the first substrate and an upper surface of the second substrate, the two groups of radiating units are symmetrically arranged relative to the first feeding line and the second feeding line, and the two groups of dual-band filters are arranged in a lamination way and are connected to the H-shaped grounding plate through via holes. A coupling between resonators of the dual-band filters is formed by folding, a radiating zero point can be introduced to the exterior of two frequency bands of the filtering antenna, the selectivity of the filtering antenna is improved very well, and moreover, the impedance bandwidth of the filtering antenna can be improved by adjusting the positions of the dual-band filters inserted into the feeding lines.

The invention discloses a differential dual-band dual-polarized filtering antenna applied to a 5G Sub 6GHz base station system. The antenna comprises upper-layer and lower-layer dielectric substratesand four metal columns connecting the upper-layer and lower-layer dielectric substrates; the upper-layer dielectric substrate 1 is provided with a metal radiation patch, and a metal floor 2 is arranged on the upper surface of the lower-layer dielectric substrate and a metal feeder is printed on the lower surface of the same; the dual-band filtering property of the gain is acquired through slottingthe metal radiation patch and introducing a stepped impedance type open circuit branch knot into the metal feeder. The differential dual-band dual-polarized filtering antenna has the advantages of being simple in structure, easy to machine, relatively wide in resonant bandwidth within radiation band, relatively good in dual-band filter response, stable in gain and directional diagram, relativelylow in cross polarization, relatively high in port isolation, and easy to be integrated with the differential circuit. The differential dual-band dual-polarized filtering antenna can be applied to the5G Sub 6GHz base station communication system, and is particularly suitable for + / -45 degree dual-polarized base station antenna system of two bands: 3.3GHz-3.6GHz and 4.8GHz-5.0GHz.

A dual band full duplex mobile radio is provided that includes a transmit portion including a dual band filter and a receive portion including a dual band filter. The dual band full duplex mobile radio further includes a circulator connecting the transmit portion and the receive portion and configured to provide transmit and receive switching.

The invention relates to an ultra-narrow bandwidth dual-band filter based on an asymmetric step impedance resonator. The ultra-narrow bandwidth dual-band filter comprises a medium substrate, a micro-strip line on the upper surface of the medium substrate and a grounding metal coating on the lower surface of the medium substrate. The micro-strip line on the upper surface of the medium substrate consists of two identical asymmetric step impedance resonators A and B, an input feed line and an output feed line. The resonator A is folded with the resonator B into a spiral shape, the resonators A and B are mutually coupled with each other in a weak manner, and the input and output feed lines are respectively coupled with the resonators A and B to feed. The dual-band filter in the embodiment has a small size and good frequency selectivity, low insertion loss inside a pass-band and high attenuation outside the pass-band can be realized, and the ultra-narrow bandwidth dual-band filter can be used for the design of a ultra-narrow bandwidth miniaturized dual-band filter in a wireless communication system.

The invention discloses a coaxial cavity dual-band filter based on a stepped impedance structure. The filter provided by the invention is formed by coupling of several stepped impedance coaxial cavity resonator units. Each stepped impedance coaxial cavity resonator unit is composed of three parts, namely two rod-shaped solid metallic conductors, a tubular metallic wall and a filler. The filler is air and is positioned in a resonant cavity between the tubular metallic wall and the rod-shaped solid metallic conductors. The upper and lower ends of the tubular metallic wall are provided with outer cover plates for sealing the resonant cavity. The several stepped impedance coaxial cavity resonator units are arranged in a linear parallel structure. The two rod-shaped solid metallic conductors are two coaxial cylinders with different diameters and are divided into a lower conductor cylinder and an upper conductor cylinder. The two conductor cylinders are connected in series up and down. The lower conductor cylinder is electrically connected with a feeder line of an input or output port. According to the invention, two passbands are realized by the stepped impedance coaxial cavity resonator units; passband frequency ratio adjustable range is large; the size of the filter is small; and the structure of the filter is simple and reasonable.

Disclosed is a switchable dual-band filter, which comprises a first and a second switchable resonators, a coupling structure having two ends respectively connecting the first and the second switchable resonators, an input impedance conversion circuit connecting an input terminal and the first resonator, and an output impedance conversion circuit connecting an output terminal and the second resonator. The coupling structure couples the first resonators to the second resonator, and via verse. The input / output impedance conversion circuit converts the impedance on the input / output terminal into two distinct impedances that correspond to a first and a second operating frequency. The filter is simple in structure, occupies less circuit area, and is cost-effective in manufacturing. The impedance at both operating passbands can also be matched properly.

A signal input / output line 101 is used for input and output of a signal. A first resonating part 102 is connected to the signal input / output line 101 at one end and is opened at the other end. A second resonating part 103 is connected to a ground conductor 105 at one end and is opened at the other end. A connecting line 104 has a predetermined length and is connected to a point of connection between the signal input / output line 101 and the first resonating part 102 at one end and is connected to a predetermined point on the second resonating part 103 at the other end.

The invention discloses a dual-band bandpass filter based on a single rectangular SIW structure. The present invention is based on a rectangular SIW structure and controls the first four resonant modes of the filter, namely TE101, TE201, TE301 and TE401 modes, by using a method of metal via disturbance. TE101 and TE201 combine to form a first passband, TE301 and TE401 combine to form a second passband. In addition, the bandwidth and spacing of the two passbands can be tuned relatively independently by disturbing vias through movement. At the same time, the offset input and output feeders introduce four transmission zeros into the filter, which improves the stopband attenuation of the filter. By utilizing single SIW cavity mode reasonably, it meets the miniaturization requirement of modernmulti-standard RF system and solves the problems of large size and complex design of a traditional dual-band filter.

The invention discloses a double-frequency filtering power divider for WLAN (wireless local area network). The double-frequency filtering power divider comprises a substrate (1), a broadband power divider (2) and a double-frequency filter (3). The double-frequency filtering power divider has the advantages that the filtering and power distribution functions are integrated, two resonance points are produced at the working frequency band of the WLAN, and the miniature design is favorably realized in a WLAN communication system; the broadband power divider (2) is of a T-shaped node structure, the broadband property is realized, and the insertion loss is less than the insertion loss of the traditional Wilkinson power divider; the basic type of the double-frequency filter (3) adopts a two-order SIR (step impedance resonator), and two different resonance points can be obtained by adjusting the widths and lengths of two micro band lines of the SIR.

The invention discloses a dual-band filter applied to the communication field. The dual-band filter comprises a medium substrate provided with a grounding through hole, a main circuit located on the upper surface of the medium substrate, and a metal floor located on the lower surface of the medium substrate. The main circuit is formed by concatenation of two dual-band resonators arranged in an axial symmetry mode, the two dual-band resonators are connected through the grounding through hole, and each dual-band resonator is connected with an input transmission line or an output transmission line. Each dual-band resonator comprises a low-impedance transmission line, an L-shaped short circuit high-impedance transmission line and an open circuit transmission line, wherein the L-shaped short circuit high-impedance transmission line and the open circuit transmission line are respectively connected on the low-impedance transmission line. The dual-band filter overcomes the defects that a traditional dual-band filter is complex in structure, large in size and the like, and has the advantages of being high in frequency selectivity, good in interband isolation performance, compact in structure and small in size, and center frequency and bandwidth can be controlled easily.

The invention discloses an RQMSIW-based ultra-compact dual-band band-pass filter. The RQMSIW-based ultra-compact dual-band band-pass filter is based on a QMSIW structure, a ridge waveguide is loaded therein, so that the filter generates a resonance characteristic similar to a rectangular cavity, an open circuit strip line is embedded in the lower side of the ridge waveguide, a higher mode, i.e., aTE201 mode, of the filter is excited, dual-band response is generated, and two stubs loaded on the strip line are used for improving performance of a second frequency band. The dual-band filter is realized in the QMSIW structure for the first time, thereby providing a new idea for studying an SIW structure-based dual-band filter.

In one embodiment of the invention, decompressed video signals are upscaled and then filtered using a combined mosquito noise reduction (MNR) and aliasing coring filter that reduces both mosquito noise in the decompressed video signals as well as aliasing noise resulting from the upscaling process. In one implementation, the combined coring filter includes a dual-band filter having two passbands interleaved with two stopbands. The strength of the coring filter may be dynamically controlled based on compression information (e.g., quantizer scales indicative of video quality) associated with the compressed video bitstream from which the decompressed video is recovered.

The invention relates to an HMSIW (half mode substrate integrated waveguide) dual-mode dual-band filter capable of independently controlling bandwidths. The dual-band filter is formed by using a double-layer HMSIW cavity staggered folding manner and a vertical coupling manner; TE101 and TE201 modes of HMSIW cavities work simultaneously, the TE101 modes of the two cavities constitute a first pass band and the TE201 modes of the two cavities constitute a second pass band; a middle layer comprises 6 coupling grooves and the coupling intensity of the two pass bands can be controlled by changing the size of the coupling grooves; input and output feeders are loaded on an upper metal surface and a lower metal surface respectively. The requirement of a modern multi-standard radio frequency systemfor miniaturization is met by introducing HMSIW dual mode work and using a double layer plate overlaying manner, and the problems of large size and complex design of traditional dual-band filters aresolved.

The invention discloses a four-mode and dual-frequency filter with a coupling dual-ring structure. The four-mode and dual-frequency filter with the coupling dual-ring structure mainly is mainly formed by an inner ring dual-mode resonator with corner cut perturbation and an outer ring dual-mode resonator with patch perturbation in an embedded coupling mode, a pair of orthogonal T-shaped coupling feeder lines is arranged on the outer side of the outer ring dual-mode resonator, and the two orthogonal T-shaped coupling feeder lines are respectively and directly fed through a 50-ohm microstrip line. Because the four-mode and dual-frequency filter with the coupling dual-ring structure includes mode frequency control and further includes zero-point control, the passband selectivity is improved, a stop band inhibition effect is improved, the design requirement of a small, high-selectivity and controllable multi-mode / dual-frequency system can be met, and the filter can be applied to microwave electronic systems of mobile communication, radar, remote sensing and the like.

The invention provides a double-band filter antenna with an anti-interference feature. The double-band filter antenna is composed of a monopole antenna body and a double-band filter, and the double-band filter antenna is printed on the front face of a dielectric substrate. The monopole antenna body comprises a monopole, a rectangular ring is loaded at the top of the monopole, and two semicircular rings are loaded in the middle of the monopole. The double-band filter is of an interdigital structure. Coupling wires are arranged at the two ends of the double-band filter, and the coupling wires are formed by connecting narrow coupling wires and wide coupling wires. Coupling connecting wires are arranged on the upper portion and the lower portion of the double-band filter. An input end feeder of the double-band filter is connected with the coupling connecting wire on the lower portion, and an output end feeder of the double-band filter is connected with the coupling connecting wire on the upper portion. A metal earth plate is arranged on the back face of the dielectric substrate, and the metal earth plate is provided with a rectangular groove. The double-band filter and the antenna body are integrated, the antenna body is minimized, the antenna can work at the frequency bands with the WLAN of 2.45 GHz and 5.2 GHz at the same time, the good feature is achieved, the antenna has the good out-of-band rejection performance outside the frequency bands, and interference of out-of-band signals is effectively isolated.

A dual-band filter (10) is provided. The dual-band filter includes an input line (100), a first transmission line (140), a second transmission line (160), a third transmission line (180), and an output line (120). The input line is used for inputting electromagnetic signals. The first transmission line is electronically connected to the input line. The second transmission line is arranged parallel to the first transmission line. The third transmission line is arranged between, and parallel to, the first transmission line and the second transmission line. The output line for outputting electromagnetic signals, is arranged parallel to the input line, and is electronically connected to the second transmission line.

The invention discloses a bandwidth controllable high-frequency-ratio coaxial cavity dual-frequency filter comprising a first coaxial cavity, a second coaxial cavity, an input port, an output port, afirst rectangular metal coupling piece, a second rectangular metal coupling piece, a first step impedance wafer loading resonator, a second step impedance wafer loading resonator and a coupling window. The whole filter structure is a symmetrical structure about the center of the coupling window. The cavity dual-frequency filter with controllable center frequency can be realized and the high frequency ratio characteristic between two passband center frequencies can also be realized. Meanwhile, the bandwidth of the two pass-bands can be controlled independently within a certain range, and the advantages of the filter are small size, high power capacity and simple design and processing so that the design requirements of small dual-frequency communication systems can be met and the filter canbe applied to mobile communication, radar, satellite and other microwave electronic systems.

The invention relates to a filter type slot antenna. The filter type slot antenna comprises a dielectric plate, an input port, a microstrip line, a half-wavelength line resonator, an open branch, anda slot between a defect grounding structure and a grounding plane; the input port is disposed on the dielectric plate, and the slot is divided a first sub-slot and a second sub-slot; the microstrip line is disposed on a bottom layer of the dielectric plate, and the resonant frequency is generated by the half-wavelength line resonator loaded on the second sub-slot to obtain a dual-band filtering characteristic; and the open branch is placed on the half-wavelength line resonator, and the response frequency of the input port is increased; the slot formed in the grounding plane is used to radiateelectromagnetic waves; and the defect grounding structure is loaded on the input port, which enhances the electromagnetic coupling of the input port. The filter type slot antenna formed by integratingthe half-wavelength line resonator and the antenna described above is used, so that the size of the filter type slot antenna is smaller when the impedance in the antenna band is matched, and the effect of reducing the return loss is achieved.

The present invention discloses a planar wide stopband double-frequency filter, which is fabricated on a dielectric substrate in the manner of a printed circuit board. On the same surface of the dielectric substrate, the following elements are formed respectively: a feeder port (port1) and a feeder port (port2) for inputting or outputting the electromagnetic wave signals, a first port feeder, a second port feeder, a first resonator R1, a second resonator R2, and a third resonator R3. All the resonators are located between the first port feeder and the second port feeder; the first resonator R1 and the third resonators R3 are of the same structure and of the same impedance at every part and are placed mirror-like with respect to the second resonator R2. The resonators are all stub-loading resonators and each consists of a half-wavelength resonator and a loading open stub respectively. Through the adopting of two different resonators to obtain the double-frequency filter, the invention uses symmetrical stub-loading resonators to realize double-frequency characteristics and overcomes the interference of harmonic waves and clutter signals to obtain a relatively wide stopband.

The invention discloses a double-frequency-point cylinder conformal filter applied to WLAN (Wireless Local Area Networks), and a manufacturing method of the same. The double-frequency-point cylinder conformal filter applied to WLAN includes a cylinder conformal pedestal (1), a substrate (2) and a double-order SIR filter (3), wherein the double-order SIR filter (3) is fixedly arranged on the substrate (2); the substrate (2) fixedly attaches to a conformal curved surface of the cylinder conformal pedestal (1); the cylinder conformal pedestal (1) can be finished through processing of a 3D printing technology, and the outer surface of the cylinder conformal pedestal (1) is a common cylindrical surface, and the cylinder conformal pedestal (1) can be applied to other conformal systems; the double-frequency-point cylinder conformal filter applied to WLAN uses the double-order stepped impedance resonator (SIR) filter to realize the filtering function; different two resonant points can be obtained through adjustment of width and length of two sections of microstrip lines, and at the same time the double-frequency filter is conductive to overall minimization of the system; the double-order SIR filter (3) uses the parallel coupling wire feeding mode to generate a plurality of transmission zero points so as to improve the outband inhibition performance.

The invention relates to a packaged planar integrated gap waveguide dual-band filter, and the filter comprises three dielectric plates bonded together. The upper surface of the bottom dielectric plateis printed with a metal layer, and the metal layer is provided with a rectangular gap. Two ends of the metal layer are respectively connected with a transition gradual change line and a feed microstrip line, and the lower surface is printed with a grounding metal layer. Two sides and the center of the bottom dielectric plate are respectively provided with periodic metal via holes through perforation, thereby implementing an SIW filter. The upper surface of the top dielectric plate is printed with a metal layer, and the lower surface is printed with a metal circular patch, and the dielectric plate is provided with a periodic metal via hole through perforation, thereby forming an artificial magnetic conductor structure. The central dielectric plate separates the top dielectric plate and thebottom dielectric plate. According to the invention, the dual-band filter packaged through AMC is achieved, and the invention solves the problems of radiation loss and plane waves in a conventional filter. Meanwhile, the filter is small in gap, and is stable in structure.

The invention relates to a film structure for a filter and a triple-band filter utilizing the film structure. The film structure for the filter is (alpha H beta L) (N)|Sub|(LH) (N), wherein Sub represents a substrate, H represents a ZnS film layer, L represents a YbF3 film layer, N represents periodicity, and alpha and beta represent optical thickness coefficients of the film layer. The film structure for the filter is weak in susceptibility and easily plated; and the film layer has the advantages of high mechanical strength, good matching of internal stress, strong binding ability with the substrate and the like. According to the triple-band filter utilizing the film structure, the micro transmission to lasers in wavelengths of 1.064mum and 1.57mum is realized, wherein the transmissivity satisfies that T is more than or equal to 7% and less than or equal to 13%; and meanwhile, high transmission to bands in a wavelengths of 7.7-10.5mum is realized, and the average transmissivity T is more than or equal to 98%.

The invention discloses a three-band filter based on an SIW structure. The invention overlaps and connects a single rectangular SIW structure and two square SIW structures to form a three-band filter.The first four resonant modes of the rectangular SIW structure work simultaneously, while the square SIW structure only works in the fundamental mode. The TE101 and TE201 modes of the rectangular SIWcavity combine to form a first frequency band of the filter, and the TE301 and TE401 modes combine to form a third frequency band of the filter. The fundamental mode TE101 modes of the two square cavities are combined to form a second frequency band. At the same time, the offset input and output feeders introduce six transmission zeros into the filter, which improves the stopband attenuation of the filter. The SIW cavity mode is used to meet the miniaturization requirements of modern multi-standard RF system and solve the problems of large size and complex design of traditional dual-band filter.

A dual-band filter and method thereof include a diplexer configured to process one of a first band signal and a second band signal, which includes a frequency band different from a frequency band of the first band signal, and block the other of the first band signal and the second band signal. A balun is configured to convert the first band signal from a differential signal to a single signal in response to the first band signal being transmitted, and convert the first band signal from a single signal to a differential signal in response to the first band signal being received. A direct current (DC) voltage supply port configured to supply a DC voltage to the balun when the first band signal is received.

The invention discloses a dual-frequency filter and a mobile terminal, and the dual-frequency filter comprises a metal cavity formed by a cavity surface with five outer walls printed with metal and acoplanar waveguide, and a metal plate parallel to the coplanar waveguide is arranged in the metal cavity. The metal plate is provided with three slot lines parallel to the two long end faces of the metal plate, and the central positions of the two long end faces are respectively connected with the central conductor band of the coplanar waveguide through a metal patch. Compared with the prior art,the filter has the advantages that controllability of high-pass band width and low-pass band width is achieved, the designed filter can generate two transmission zero points between a high-pass band and a low-pass band and has the advantages of being small in size, high in return loss, good in inter-band isolation effect performance and the like, on one hand, hardware occupied space of the whole device is saved, and on the other hand, better performance experience can be provided.

The invention discloses a microwave millimeter wave dual-band filter. The microwave millimeter wave dual-band filter comprises a dielectric substrate, an upper metal surface located at the upper surface of the dielectric substrate, and a lower metal surface located at the lower surface. The upper metal surface is rectangular, and an upper micro-strip line is connected with one of two long sides while a lower micro-strip is connected with the other long side; a first annular groove and a second annular groove which are the same with each other are respectively etched in the upper metal surface, a first rectangular groove is embedded in the first annular groove while a second rectangular groove is embedded in the second annular groove, and the first rectangular groove is the same with the second rectangular groove. A row of upper metal grounding through holes arrayed at intervals are formed in each of two ends of each long side of the upper metal surface along the short sides; the size of the lower metal surface is the same with that of the dielectric substrate, the lower metal surface is connected with the ground, lower metal grounding through holes are formed in the lower metal surface in the projection positions of the upper metal grounding through holes, and each upper metal grounding through hole is connected with the corresponding lower metal grounding through hole through a metal post. The microwave millimeter wave dual-band filter is small in volume, low in consumption, simple in structure and easy to regulate the upper and lower side frequencies.

The invention discloses a double-frequency filter, and the filter is set to be a multilayer circuit. The filter comprises first resonant units disposed on the third layer and the fourth layer of the multilayer circuit; second resonant units disposed on the second layer and the third layer of the multilayer circuit; and third resonant units disposed on the third layer and the fourth layer of the multilayer circuit, wherein the first resonant units and the third resonant units have the same topological structure and are arranged in left-right mirror symmetry, and the second resonant units are cascaded between the first resonant units and the third resonant units. The filter is small in size, is small in insertion loss, has the independently adjustable working band, and can achieve the extraction of signals at multiple bands and the inhibition of interference.