415results 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.

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 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 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.

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.

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.

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 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.

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.