420results about How to "Good radiation characteristics" patented technology

A built-in antenna apparatus and a portable terminal including the same are provided. The apparatus includes a substrate, an antenna carrier, a plate type antenna radiator operating in at least one resonance band, and at least one sub antenna radiator. The substrate has a feeding pad for electrically coupling with a Radio Frequency (RF) connector. The antenna carrier for establishing preset distance from the substrate. The plate type antenna radiator is disposed on the antenna carrier. The sub antenna radiator is electrically coupled with the plate type antenna radiator.

In a method of assembling a surface illumination system having an electromagnetic radiation emitting front side, at least one primary radiation source suitable for emitting electromagnetic radiation when operating is disposed on at least one mounting area of a flexible carrier. The flexible carrier has a front side and a back side opposite said front side, the front side of the flexible carrier defines a reference plane. The mounting area of the flexible carrier on which the primary radiation source is disposed is then bent out of the reference plane such that an optical axis of the primary radiation source extends parallel or obliquely to the reference plane. In a further step, at least one light-conducting guide having a radiation emitting front side and at least one incoupling region is disposed on the flexible printed circuit board so that in operation, the primary radiation source emits radiation into the incoupling region of the light guide and the radiation emitting front side of the light guide points in the direction of the radiation emitting front side of the surface illumination system. A corresponding surface illumination system is also described.

A circularly polarized antenna has a dielectric substrate, a ground conductor which is piled up one surface side of the dielectric substrate, a circularly polarized type of antenna element formed on an opposite surface of the dielectric substrate, a plurality of metal posts whose respective one end sides are connected to the ground conductor and penetrate the dielectric substrate along a thickness direction thereof, and whose respective other sides extend up to the opposite surface of the dielectric substrate, the plurality of metal posts configuring a cavity by being provided at predetermined intervals so as to surround the antenna element, and a conducting rim which short-circuits the respective other end sides of the plurality of metal posts along an array direction thereof, and is provided so as to extend by a predetermined distance in a direction of the antenna element at the side of the opposite surface of the dielectric substrate. With the circularly polarized antenna, a radiation characteristic of the antenna can be made to be a desired characteristic by preventing a surface wave from being generated by means of the cavity and the conducting rim, and a frequency characteristic of the antenna gain can be made to have a sharp notch within the RR prohibited band by utilizing a resonance of the cavity. Accordingly, the circularly polarized antenna is effective for reducing radio interference with the EESS or radio astronomical services.

A cup waveguide antenna with integrated polarizer and OMT for simultaneously communicating left and right hand circularly polarized electromagnetic waves is adjustable to obtain efficient propagation and reception of electromagnetic waves. The antenna includes a circular waveguide having an orthomode transducer utilizing first and second pins longitudinally spaced apart and oriented orthogonally with respect to each other. Six radially-oriented adjustable polarizer screws extend from the exterior to the interior of the waveguide. A septum intermediate the first and second pins is aligned with the first pin. Adjustment of the polarizer screws enables maximized propagation of and / or response to left hand circularly polarized electromagnetic waves by the first pin while simultaneously enabling maximized propagation of and / or response to right hand circularly polarized electromagnetic waves by the second pin.

The invention provides an ultra-wideband antenna. The ultra-wideband antenna comprises a dielectric substrate, wherein a radiation unit, a feeding structure and a ground plane are printed on the dielectric substrate; the radiation unit is a forked chip; the feeding structure is a coplanar waveguide feeding structure; and the ground plane is a coplanar waveguide ground plane. The ultra-wideband antenna has a coplanar waveguide structure, so that a single planar printed antenna structure can be realized; the ultra-wideband antenna can be easily integrated with a microwave integrated circuit; the coplanar waveguide ground plane can serve as the ground plane of the whole antenna, and particularly for the coplanar waveguide structure with a wideband slot structure, wideband work can be realized, and the electromagnetic interference of outside on the antenna can be effectively avoided; and wideband impedance bandwidth can be easily realized, and the efficiency of the antenna is improved, so that higher antenna gain can be achieved.

A radio IC device that can be used in a plurality of frequency bands for RFID tags and that is compact and has superior radiation characteristics is provided. A spiral line electrode portion and a first side electrode, extending from an inner end thereof, of a capacitor electrode portion are provided on a top surface of a sheet-shaped substrate, and a second side electrode arranged to face the first side electrode and a crossing line electrode are provided on a bottom surface of the substrate. A first radio IC chip is arranged at a location in the line electrode portion, and a second RFID tag radio IC is arranged so as to be connected to a front-to-back connection portion and an end of an electric-field radiation electrode portion. The radio IC chip rectifies an RF signal in a first frequency band and outputs and supplies power to the second RFID tag radio IC.

A signal path configuration method and apparatus of a wireless device are provided for avoiding radiation performance degradation caused by holding a specific part of the wireless device. A wireless device of the present invention includes a Radio Frequency (RF) unit that includes a plurality of antennas, an RF connector for RF calibration, and a detection unit for detecting connection of an RF cable, a switch for switching a signal path to one of the plurality of antennas, and a control unit for distinguishing between communication modes based on a detection signal output by the detection unit and for generating a control signal for controlling the switch to connect the signal path to one of the antennas according to the communication mode.

The invention belongs to the technical field of materials and radomes, and specifically relates to a single-passband bilateral wave-absorbing composite metamaterial and a radome and an antenna system including the same. The single-passband bilateral wave-absorbing composite metamaterial comprises a dielectric substrate (100) made of a non-conductive material and four periodic metamaterial structure layers embedded into the dielectric substrate. The four periodic metamaterial structure layers are respectively a resistive film layer (102), a first metal patch layer (103), a second metal patch layer (104) and a third metal patch layer (105) in sequence from top to bottom. The metal patch layers for realizing frequency selection enable an array antenna to keep good radiation characteristic and communicate freely in an X band; and meanwhile, in the S band, Ku band and K band at the two sides of the passband of the X band, the resistive film layer with wave absorption characteristic and the metal patch layers in the composite metamaterial radome work together, and electromagnetic wave which is incident on the radome and then reflected back by the metal patch layers is well absorbed.

The invention provides a millimeter wave differential feeding dual-polarized electromagnetic dipole antenna. The traditional dual-polarized dipole antenna is poor in port isolation and complex in structure, and is not applicable to the millimeter wave band. According to the millimeter wave differential feeding dual-polarized electromagnetic dipole antenna, a dual-polarized differential feed structure is achieved in a slot coupling manner based on a substrate integration waveguide technology, so that the antenna can work in the millimeter wave band, and has good characteristics including relatively wide working bandwidth and good radiation directional diagram symmetry, the relative bandwidth can reach 28.1%, the cross polarization can be less than -30dB, and the port isolation in the passband can be more than 45dB. In addition, such a structure is machined by using the PCB technology, and is easy to machine and low in cost, and thus the antenna provided by the invention can be mass produced.

An antenna, in particular a mobile radio antenna, operates in at least two frequency bands. Two or more dipole antenna elements are provided and are arranged in front of a reflector, which transmit and receive in two different frequency bands. The distance between the antenna element structure, the antenna elements or the antenna element top of at least one dipole antenna element for the higher frequency band is at a distance from the reflector plane which corresponds to at least 75% and at most 150% of the distance between an antenna element structure. An antenna element or an antenna element top of at least one dipole antenna element for the lower frequency band and the reflector plane, and / or the distance between the antenna element structure, the antenna elements or the antenna element top of at least one dipole antenna element for the higher frequency band is at a distance from the reflector plane which is greater than 0.4λ and is preferably less than 2λ with respect to the mid-frequency of the antenna element for the higher frequency.

Disclosed herein are a power module using sintering die attach and a manufacturing method of the same. The power module includes: a substrate having an insulating layer formed on a surface of a metal plate; a circuit layer formed on the substrate and including a wiring pattern and an electrode pattern; a device mounted on the wiring pattern; a sintering die attach layer applying a metal paste between the wiring pattern and the device and sintering the metal paste to bond the wiring pattern to the device; and a lead frame electrically connecting the device to the electrode pattern, whereby making it possible to to simplify and facilitate the process, increase electrical efficiency and improve radiation characteristics, and manufacture firm and reliable power module.

In an information processing apparatus such as a notebook type personal computer having radio communication functions, for communication units to simultaneously carry out transmission / reception independently of each other without increasing the number of antennas, and for sufficiently utilizing a diversity function in the case of only a portion of the communication units, there are provided antennas, communication units capable of carrying out radio communications through the use of the antennas, respectively, and a switching unit for switching connection states between the antennas and the communication units. When radio communications are simultaneously made through the use of all the communication units, the switching unit establishes connections between the communication units and the antennas while, when radio communication is made through the use of the communication unit, the switching unit connects the antennas, the number of which depends on communication modes of the communication unit, with this communication unit.

The invention provides a planar dual-polarization UWB-MIMO antenna which is compact in structure and high in port isolation and has ultra wide impedance bandwidth and the good matching feature. The antenna comprises a medium substrate. The upper surface of the medium substrate is provided with four dual-polarization UWB wide-slot antenna units of the same structure, a rectangular coordinate system is built with the center of the medium substrate as the origin of the coordinate, and the four dual-polarization UWB wide-slot antenna units are symmetric about the X axis and the Y axis of the rectangular coordinate system respectively. According to arrangement mode of the dual-polarization UWB wide-slot antenna units, the features of the antenna units are utilized very skillfully, and no other isolation structure is needed to be additionally arranged among the UWB wide-slot antenna units to improve the isolation, so that good matching, isolation and radiation features of the antenna units can be kept, the MIMO antenna structure of the composition is compact in structure and high in port isolation, has ultra wide impedance bandwidth and good matching and is suitable for being applied and popularized in the field of antenna technologies.

A dual-band loop antenna for using in a mobile phone for (890˜960 MHz) / DCS(1710˜1880 MHz) application is disclosed to include a ground plane in a substantially rectangular shape having a grounding point and a shorting point, a radiating metallic loop having a feeding end and a shorting end electrically connected to the shorting point of the ground plane and spaced from the feeding end at a predetermined distance, and a radiating metallic plate surrounded by the radiating metallic loop and having one end electrically connected to a vicinity around the shorting end of the radiating metallic loop and spaced from the shorting end of the radiating metallic loop at a distance less than 10 mm.

The invention discloses a high-isolation MIMO (Multiple Input Multiple Output) antenna, and belongs to the technical field of antennas. The whole antenna is symmetric around a central axis by a left and right mirror manner. The antenna comprises a rectangular dielectric substrate, a first radiator, a second radiator, a first microstrip feeder, a second microstrip feeder, an isolator, and a grounding plate which is equipped with a rectangular gap and arranged on the rear surface of the dielectric substrate, wherein the first radiator, the second radiator, the first microstrip feeder, the second microstrip feeder and the isolator are arranged on the front surface of the dielectric substrate. According to the antenna, the isolation performance of the system can be improved by the isolator; slots are formed in a floor, so that the bandwidth of the antenna can be increased; the problems of poor isolation, narrow frequency band and large size of the traditional MIMO antenna can be effectively reduced.

The invention relates to a cavity-backed circular polarization antenna for coplanar waveguide single-point feeding. The common cavity-backed circular polarization antenna has complicated structure, large volume, non-planar integration, as well as high cost. Two surfaces of a medium substrate of the invention are plated with metal layers, the upper metal layer is etched with a micro-strip line used for feeding, and a common ground and coplanar waveguide transmission line, and as the micro-strip line, the middle metal belt of the coplanar waveguide transmission line extends outwardly. The upper metal layer, the medium substrate, and the lower metal layer are opened with a plurality of metallized through holes arranged as a square, so as to form a cavity, and the coplanar waveguide transmission line dives into the cavity. The lower metal layer is etched with two mutually perpendicular long-shaped radiation slot in corresponding cavity area. Compared with the cavity-backed circular polarization antenna composed by prior metal cavity, the invention adopts common PCB process to manufacture, the manufacturing cost is low, and can realize seamless integration with the micro-strip circuit, thereby improving systemic integrated level.

A multimode occulting antenna with a stable phase center comprises a reflection cavity, a lower radiation paster, an upper radiation paster, four feed probe sleeves, four feed probe inner cores and two support columns. Each feed probe sleeve comprises a metal seat and filler, one end of the metal seat is a metal column, the other end of the metal seat is a cylindrical metal cavity, and the filler is used for filling the cylindrical cavity of the metal seat. The sleeve-shaped probes are coupled with feed through four points, probes are uniformly distributed on the circumference, an aerial radiation paster consists of an upper layer and a lower layer, the lower layer is coupled with the feed through the sleeve-shaped probes, the upper layer is coupled with the feed through the lower radiation paster, the middle is supported by the metal support columns, and the reflection cavity is of a round bowl-shaped structure and higher than the upper radiation paster. The occulting antenna is excellent in performance and structure, simple and reliable in process, wide in frequency band, capable of meeting use requirements of a GPS (global positioning system), BD-2, GALILEO and GLONASS, wide in beam coverage, high in gain, stable in phase center, excellent in axial ratio performance, and applicable to a precise obscuration detection system and other high-precision detection systems.

The invention discloses a broadband dipole antenna based on an artificial magnetic conductor structure. The broadband dipole antenna comprises a dipole antenna body and the artificial magnetic conductor structure. The dipole antenna body is composed of antenna radiation branches, an arc-shaped feeder line and a flexible dielectric substrate, wherein the antenna radiation branches are four S-shaped branches, the upper S-shaped branch and the lower S-shaped branch are symmetrical with respect to the center point of the flexible dielectric substrate, the left S-shaped branch and the right S-shaped branch are symmetrical with respect to the center point of the flexible dielectric substrate, the upper S-shaped branch is connected with the left S-shaped branch through a rectangular patch, the lower S-shaped branch is connected with the right S-shaped branch through a rectangular patch, the upper S-shaped branch and the left S-shaped branch are located on the front face of the flexible dielectric substrate, the lower S-shaped branch and the right S-shaped branch are located on the back face of the flexible dielectric substrate, and the arc-shaped feeder line is connected with the S-shaped branches on the front face of the flexible dielectric substrate through a rectangular patch. The artificial magnetic conductor structure is composed of an artificial magnetic conductor flexible dielectric substrate, a periodic square patch unit and a metal floor. The broadband dipole antenna has the advantages of being flexible, small in size, low in profile, broad in band, low in radiation, high in gain, attractive and the like, and is suitable for the field of body area networks.

The invention discloses an end-fire type artificial surface plasmon antenna, comprising a medium substrate, a microstrip line, a surface plasmon waveguide, a transition transmission line from the microstrip line to the surface plasmon waveguide, a printing dipole and an I-shaped structural resonator array; the end-fire type artificial surface plasmon antenna works at a microwave frequency band; feed is carried out by the microstrip line; transition to the surface plasmon waveguide is realized through the transition transmission line; the artificial surface plasmon waveguide is taken as activation; the printing dipole is taken as a main radiation part; meanwhile the radiation performance is improved through the I-shaped structural resonator array. The antenna of the invention is featured by simple structure, easy processing, small size, high gain and high radiation efficiency and can realize radiation of the artificial surface plasmon in the end-fire direction.

The invention discloses a circularly polarized multimode wideband antenna and microstrip power division phase shift network, which comprises an antenna and feed network, wherein the feed network consists of a primary feed circuit and a secondary feed circuit; the primary feed circuit consists of a power divider and a 180-degree wideband phase shifter which are concatenated, and is externally connected with a master port of a signal source; the secondary feed circuit comprises two feed circuit units; and each feed circuit consists of the power divider and a 90-degree wideband phase shifter which are concatenated. The circularly polarized multimode wideband antenna and microstrip power division phase shift network has high performance, and can be applied to four conventional satellite navigation positioning service systems; the antenna adopts radiation patch grooving to improve an impedance bandwidth, greatly reduces an antenna thickness, and has high radiation characteristics and electrical characteristics; and quadruple power division phase shift network feed is adopted so as to greatly increase a circular polarization bandwidth and circular polarization purity.

The invention discloses a Ku / Ka dual-band transmitting-receiving community antenna feed source assembly, which comprises a Ku / Ka waveband antenna feed assembly and a polarization adjusting mechanism, wherein the Ku / Ka waveband antenna feed assembly comprises a Ku waveband transmitting and receiving assembly and a Ka waveband transmitting and receiving assembly; and the polarization adjusting mechanism comprises a driving motor assembly, a transmission gear, a Ka rotation joint, a Ku transmission rotation joint and a Ku receiving rotation joint, and the driving motor assembly drives the Ka rotation joint, the Ku transmission rotation joint and the Ku receiving rotation joint to adjust a polarization angle through transmission of the transmission gear. The Ku / Ka dual modes share one feed source horn, a dielectric rod is cancelled, a full-waveguide mode is adopted, the structure is compact, the utilization rate is high, Ka circular polarization switching is facilitated, good Ku / Ka wave frequency band isolation is provided, and good polarization separation, polarization isolation, radiation features, a standing-wave ratio and gains are realized in the frequency band; and Ku line polarization adjustment can be carried out in real time, and automatic satellite aiming is realized.

The invention discloses a broadband dual-polarization base station filter antenna unit without an external filter circuit and an array thereof. The antenna unit is arranged in the middle of the reflector. The antenna comprises an oscillator arm, a balun and two parasitic metal rings. The vibrator arm is provided with a microstrip line branch, is connected through the balun, and is fed through thebalun, and the balun is provided with a feeder line. The upper part and the lower part of the vibrator arm are respectively provided with parasitic metal rings. The antenna unit has the characteristics of compact and simple structure. The invention realizes good out-of-band rejection effect and has good frequency selectivity without cascading filter, thus avoiding filter insertion loss. The invention realizes high polarization isolation, and realizes stable pattern in wide frequency band at the same time.

The invention discloses a liquid crystal electrical control zero-crossing scanning leaky wave antenna based on comb-line waveguide, which belongs to the technical field of microwave antenna construction. The problems that a conventional electrical control scanning leaky wave antenna based on a varactor and other traditional electric tuning elements difficultly works in a microwave high frequency band and the existing liquid crystal electrical control fixed-frequency scanning leaky wave antenna is difficult to realize zero-crossing scanning and requires a bias circuit which is specially designed are solved. The antenna provided by the invention comprises a top dielectric plate layer, a metal layer, a liquid crystal layer and a bottom waveguide groove. The metal layer is arranged between the top dielectric plate layer and the bottom waveguide groove. A longitudinal groove structure is arranged on the upper surface of a rectangular plate to form the bottom waveguide groove. The metal layer is in a comb-line structure. N periodic slit units are arranged between two columns of comb teeth on the comb-line structure. N periodic slit units comprise two groups of vertical slit columns and a group of transverse slit column. Through periodic transverse slits, the equivalent series inductance of electromagnetic waves spreading between the bottom waveguide groove and the metal layer is increased. Through periodic vertical slits, the equivalent parallel capacitance is increased.

Disclosed herein is a combined varistor and LC filter device in which both a varistor function of protecting circuits by absorbing surge voltage and an electromagnetic interference filter function of improving radiation characteristics are implemented in a single chip, thus having reduced mounting area. The combined device includes a body which acts as an insulator at voltages below a predetermined level, and the resistance of which decreases rapidly at voltages above a predetermined level. Inductance patterns constituting an LC resonant circuit, capacitance patterns and ground patterns are implemented in the body in a multilayer structure. The combined device operates as an LC filter at a low voltage and operates as a varistor at a high voltage.

A speaker device for a portable terminal is provided. The device includes a case frame forming an exterior of the portable terminal, a speaker installation space provided at an inner surface of the case frame to install a speaker therein, a barrier wall formed to provide a resonance space near the speaker installation space, and a cover installed to seal the resonance space.

The invention discloses a fractal media resonant antenna used as a paraboloidal feed source. The fractal media resonant antenna used as the paraboloidal feed source comprises a feed circular waveguide and a media radiator; the media radiator comprises a front internal cylindrical media matching section and a rear external tapered media radiator which are respectively a cylinder body and a tapered body prepared by rotating forming contour lines. The fractal media resonant antenna used as the paraboloidal feed source has the advantages of being large in bandwidth, large in beam width, low in sidelobe and back lobe levels, uniform in amplitude and phase distribution in a main lobe, low in cross-polarization level, high in gain, high in efficiency, small in size, and low in cost; the antenna has the optimal type suitable for a paraboloidal reflector feed source with relatively small focus-diameter ratio F / D.