34results about How to "Suppression of surface waves" patented technology

An antenna unit formed in the shape of a hollow box comprising (a) a substrate forming the front side of the antenna unit, (b) a first microstrip antenna array formed on the substrate, (c) a second microstrip antenna array formed on the substrate, (d) a ground plane forming the rear side of the antenna unit, and (e) a plurality of periodic filters formed on the ground plane. The periodic filters are formed by etching a series of circular patterns, or holes, through the ground plane. The periodic stop band filters provide for improved isolation between the microstrip antenna arrays, without the need for adding additional costly or space consuming components.

A linearly polarized antenna includes a dielectric substrate, a ground conductor which is overlapped on one surface of the dielectric substrate, an antenna element made of linearly polarized, which is formed on an opposite surface of the dielectric substrate, a plurality of metal posts in which one end side of each of the plurality of metal posts is connected to the ground conductor, the plurality of metal posts piercing through the dielectric substrate along a thickness direction thereof, another end side of each of the plurality of metal posts being extended to the opposite surface of the dielectric substrate, the plurality of metal posts being provided at predetermined intervals to form a cavity so as to surround the antenna element, and a conducting rim which short-circuits the other end side of each of the plurality of metal posts along a line direction of the plurality of metal posts on the opposite surface side of the dielectric substrate, the conducting rim being provided while extended by a predetermined distance toward a direction of the antenna element, the conducting rim having, e.g., a triangular portion. In the linearly polarized antenna, generation of a surface wave is suppressed by the cavity and the conducting rim, and the antenna can be set to the desired radiation characteristic. Additionally, a frequency characteristic of an antenna gain can have a steep decline (notch) in an RR radio-wave emission prohibited band by utilizing a resonance phenomenon of the cavity. Therefore, the linearly polarized antenna is effective in decreasing radio wave interference with EESS or radio astronomy service.

The invention belongs to the technical field of the communication, specifically a Circular-polarized back-cavity waveguide slot array antenna realized near-field coupling polarizer. The antenna array is composed of two parts: the lower end is the linear-polarized back-cavity waveguide slot array with high gain and low section, and the upper end is a biparasitic corner-truncated patch polarizer; the corner-truncated patch polarizer is composed of two corner-truncated parasitic patches, each two patches are isolated by using a metal belt electrically connected with a metal through hole; the linear-polarized back-cavity waveguide slot array is composed of a coaxial interface, a feed waveguide network, a coupling slot, a resonant cavity, a radiation slot and a support column; a periodical metal prop integrally machined with lower end antenna is supported between the polarizer and the antenna array plane; the assembling is convenient, the structure is compact, the additional loss material is unnecessary to import, and the features of high gain and low loss of the original waveguide back-cavity antenna are maximally reserved; furthermore, the surface wave between a polarizer medium substrate and an air contact surface can be commonly inhibited, and the performance of the antenna is effectively improved.

The invention provides a dual polarized antenna array and a dual polarized phased-array antenna. The dual polarized antenna array comprises a polarized feeder component, a coupling slot component, a plurality of radiation patches and a metallized via hole component, wherein the polarized feeder component comprises a first polarized feeder and a second polarized feeder, the coupling slot componentcomprises a plurality of first coupling slots and a plurality of second coupling slots perpendicular to each other, the radiation patches are positioned at the upper layer of the coupling slot component, and a plurality of metallized via holes arranged side by side are positioned between the first coupling slots and the second coupling slots. Through introducing the metallized via hole, each polarized feed network is isolated, so that the cross polarization component caused by cross coupling between the feeders can be effectively inhibited, and the cross polarization isolation of the dual polarized phased-array antenna provided by the scheme is more than 35dB.

The invention relates to a 2-3GHz band microstrip antenna with a negative permeability material, in particular to a microstrip antenna with a negative permeability material with two-sided dendritic structures. The microstrip antenna in the invention comprises a dielectric substrate, a metal radiation patch and a metal ground plate; wherein, the metal radiation patch and the metal ground plate are etched at both sides of the dielectric substrate; an SMA connector connects the metal radiation patch and the metal ground plate and serves as a feed-in interface of radio wave signals of the antenna; dendritic structure cell arrays arranged periodically are etched at both sides of the space around the metal radiation patch and the metal ground plate. When electromagnetic waves enter vertically, the negative permeability effects generated by the two-sided dendritic structures can be adopted to improve the transmitting efficiency and directionality of the microstrip antenna and increase the antenna gain.

The invention provides a filtering antenna device. The filtering antenna device comprises an SIW filtering structure and an SIW radiation structure which is cascaded with the SIW filtering structure;the SIW filtering structure comprises a first resonant cavity and a second resonant cavity which are stacked in an up-down mode and communicate with each other; the SIW radiation structure comprises aback cavity and a metal patch; the back cavity is arranged side by side together with the first resonant cavity and the second resonant cavity, and communicates with the first resonant cavity and thesecond resonant cavity; the metal patch is contained in the back cavity; the filtering antenna device further comprises a feed port and a first coplanar waveguide which are arranged on one side, faraway from the back cavity, of the first resonant cavity, a second coplanar waveguide arranged on one side, close to the back cavity, of the second resonant cavity, a transmission line arranged in theback cavity and connected with one end of the second coplanar waveguide, and a probe connected with the transmission line and the metal patch; and one end of the first coplanar waveguide is connectedwith the feed port, and the other end of the first coplanar waveguide is opposite to the end part, far away from the transmission line, of the second coplanar waveguide. Compared with the prior art, the filtering antenna device provided by the invention can inhibit the interference of out-of-band stray signals to effectively reduce the surface wave loss.

The invention belongs to the technical field of active phased array radar and antennas. In order to solve the problems that the existing blind spot suppression techniques cannot suppress the scanningblind spots in a wide frequency range and the design difficulty increases due to the introduction of additional structures, the present invention provides a microstrip antenna unit comprising a dielectric plate and a feeding structure arranged on the dielectric plate, the feeding structure being used for suppressing scanning blind spots of the microstrip antenna array. By vertically arranging thesecond feeding structure in the dielectric plate, the surface wave of the microstrip antenna element can be effectively suppressed, thereby eliminating the scanning blind spots of the microstrip antenna array in a wide scanning range.

The invention discloses an AMC-based low-profile circularly-polarized cross dipole antenna and communication equipment. The AMC-based low-profile circularly-polarized cross dipole antenna comprises anupper dielectric substrate, a lower dielectric substrate, a main radiation unit, a parasitic unit, an AMC metasurface and a reflection floor, wherein the upper dielectric substrate and the lower dielectric substrate are arranged in parallel at a certain interval; the main radiation unit and the parasitic unit are arranged on the upper dielectric substrate; the upper surface of the lower dielectric substrate is provided with the AMC metasurface, and the lower surface of the lower dielectric substrate is provided with the reflection floor; and the main radiation unit comprises two pairs of dipoles, the two pairs of dipoles are of a cross-shaped cross structure, and a cross point is located at the center point of the upper dielectric substrate. The antenna has the characteristics of good circular polarization radiation performance, low profile and high gain, and can cover a part of C frequency bands of satellite communication.

This invention provides a double frequency wide band electromagnetic band gap (EBG) structure and its manufacturing method characterizing that the provided structure is a mixed one combining a punch structure and a high resistant surface structure, the medium substrate in the EBG structure is square with the punch and high resistant structure adhered closely on its surface, the central frequencies of the stop-bands are 1.6GHZ and 2.4GHz. The punch and high resistant structures are composed of a periodical metal plate unit, punch narrow gaps and metallic post on the plate. According to a known work frequency, the medium thickness and its dielectric constant, the micro-band line width, the sizes of the substrate, the quadrant metallic plate and high resistant surface gap are computed preliminarily then to determine its final sizes by optimizing and emulating utilizing the emulation software of HFSS8.0 edition.

The invention discloses an orthohexagonal EBG structure used for an antenna and a manufacturing technology thereof, belongs to the technical field of wireless communication, and solves the problems that a traditional EBG structure is large in structure size, difficult to meet the requirement of miniaturization and jagged in forbidden band characteristics in all directions. The orthohexagonal EBG structure used for the antenna mainly comprises a MARK layer, a first-order white board layer set, a coil layer set, a bottom electrode layer and a second-order white board layer set from top to bottomin sequence through overlapping. According to the orthohexagonal EBG structure used for the antenna, the product size is greatly reduced, and the requirement of wireless communication field on the miniaturization of the EBG structure is met; the heights of the forbidden band characteristics in all directions are the same; the technological process is reliable and practicable, the manufactured product is stable in performance, the orthohexagonal EBG structure used for the antenna is significant for improving the performance of a patch antenna, and the EBG structure can be widely applied to thetechnical field of wireless communication.

The embodiment of the invention provides a handheld interference unit and an interference unit antenna thereof. The interference unit antenna comprises: an antenna body which comprises a first dielectric plate and a radiation patch formed on the surface of the first dielectric plate, wherein a radiation signal of the interference unit antenna is transmitted in the extension direction of the first dielectric plate, and is output from the end part of the first dielectric plate; and a metamaterial antenna housing arranged in parallel with the first dielectric plate at an interval and corresponds to the position of the radiation patch, wherein the metamaterial antenna housing covers the radiation patch in the extending direction of the first dielectric plate so as to suppress surface waves radiated from the radiation patch.

The invention relates to a PIFA, in particular to a PIFA with an Archimedes spiral EBG structure used as a floor board. The PIFA with the Archimedes spiral EBG structure used as the floor board solves the problems that an existing PIFA is low in radiant efficiency and large in overall size. The PIFA with the Archimedes spiral EBG structure used as the floor board comprises a radiation sheet, a short circuit plate, the floor board, a coaxial inner conductor and a coaxial outer conductor; the radiation sheet and the floor board are sequentially arranged side by side in parallel from top to bottom; the tip of the left end of the radiation sheet is connected with the tip of the left end of the floor board through the short circuit plate; the coaxial outer conductor is vertically arranged below the left end of the floor board, and the upper end of the coaxial outer conductor is connected with the lower surface of the left end of the floor board; the coaxial inner conductor is vertically arranged between the radiation sheet and the floor board, and the upper end of the coaxial inner conductor is connected with the lower surface of the left end of the radiation sheet. The PIFA with the Archimedes spiral EBG structure used as the floor board is applied to the field of wireless communication.

The invention relates to a PIFA, in particular to a PIFA with an I-shaped fractal EBG structure as a floor. The PIFA solves the problems that an existing PIFA is low in radiation efficiency and large in overall size. The PIFA comprises a radiation sheet, a short-circuit board, a floor, a coaxial inner conductor and a coaxial outer conductor. The radiation sheet and the floor are sequentially arranged side by side in parallel from top to bottom, the left end of the radiation sheet is connected with the left end of the floor through the short-circuit board, and the coaxial outer conductor is vertically arranged below the left end of the floor. The PIFA is applied to the field of wireless communication.