62results about How to "Reduced Radiation Efficiency" patented technology

A novel approach is disclosed that mitigates flare-end ringing induced distortion of impulse signals that are transmitted from an electromagnetic radiator. Conventional tapering suppresses energy in the return path by impedance loading the antenna element at the expense of reduced radiation efficiency. This disclosure presents a method that balances the trade-off between radiation efficiency and return path energy suppression while it simultaneously minimizes taper induced signal distortion effects on the front edge of the transmitted impulse. The balance between radiation efficiency, end-fire ringing, and impulse distortion is achieved by placing impedance loading at only at or near the second half of the antenna element. Recent disclosures show the advantage of determining the position of each band through mathematical calculation and by subsequently removing select bands near the feed point to move the reflected pulse away from the front-edge of the transmitted impulse. This disclosure will show that optimal placement of the first tapered band is substantially more critical. The reflection caused by this interface must reach the original impulse at a position that will minimally interfere with its front edge.

A precise GNSS directional antenna includes a reflection cavity, a radiation lower patch, a radiation upper patch, four L-shaped metal feed probes, a first supporting column, a second supporting column and a choke groove. The reflection cavity is a hollow cylinder of which a bottom surface is closed, height of the reflection cavity is a little bit lower than the radiation upper patch and higher than the radiation lower patch, the radiation lower patch is higher than the L-shaped metal feed probes and concentrically connected with an inner bottom surface of the reflection cavity by the second supporting column, and the radiation upper patch is concentrically connected with the radiation lower patch by the first supporting column. The four L-shaped metal feed probes are installed on an inner bottom surface of a transmitting cavity and uniformly distributed on same circle. The bottom surface of the reflection cavity is installed on the choke groove, the choke groove is a pyramidal structure, height of four choke rings decreases progressively from the inside to the outside, and each choke ring has equal depth and equal interval. The precise GNSS directional antenna has wider beam coverage capability and strong multi-path interference resistance in low elevation direction, and is suitable for a precise positioning system.

The invention relates to a circular polarization waveguide standing-wave antenna which solves the problems of low efficiency, wave beam orientation changed along with the frequency and the like of the prior circular polarization waveguide gap traveling-wave antenna. Both sides of the center line of the longitudinal wide edge of a feed waveguide tube with a rectangular cross section are evenly distributed and provided with more than two coupling gaps in a staggered way, and the middle part of the wide edge at one side of the feed waveguide tube is provided with a coaxial connector; both ends of the feed waveguide tube are sealed, a four-ridge metal ridge radiation waveguide is arranged at the coupling gaps at the wide edge of the feed waveguide tube, and the diagonal line of the opening face of the four-ridge metal ridge radiation waveguide and the coupling gaps are on the same straight line. The invention can realize that energy enters a waveguide cavity and is completely radiated out, and the radiation efficiency of the antenna is greatly enhanced; the problem of inconsistent orientation of wave beams with different working frequencies of the waveguide traveling-wave antenna is solved, and the tracking of the antenna to a satellite is easy.

The invention provides a vehicular radar array antenna. The vehicular radar array antenna comprises a radiation fin array and an impedance matching network arranged on the same plane, and the radiation fin array is configured in a bilateral symmetry manner by taking the impedance matching network as the center axis. According to the invention, a novel feed network is employed, based on the microstrip line impedance match and phase shift principle, relevant parameter demands of the antenna radiation array are achieved by means of a simple implementation form, and furthermore product optimization is achieved. The simulation of the vehicular anticollision radar array antenna and the debugging of the antenna sample are convenient and fast, by arranging the impedance matching network and the array antenna in the same plane, the whole radar antenna profile is reduced, and the duty ratio of the antenna feed part in the whole vehicular radar is effectively reduced. By employing the novel design concept and design method, a conventional feed power splitting network structure with a complicated back side is broken through, electromagnetic interference on other radio frequency devices is effectively reduced, and the vehicular radar array antenna has a deep business application value in the actual engineering.

On an antenna forming face (9) in a rectangular shape which a dielectric base (7A) has, a linear element (11A) is provided adjacently only peripheries (9a, 9b, 9c, and 9d) of the antenna forming face (9). From the linear element (11A), a linear conductor (25) for matching impedance branches. Since the linear element is adjacent to only the peripheries (9a, 9b, 9c, and 9d) of the antenna forming face (9), portions of the linear element (11A) do not become adjacent to each other. Accordingly, mutual interference which easily occurs when the portions of the linear element (11A) are adjacent to each other does not occur, so that decrease of radiation efficiency of the dielectric antenna (1A) and hindrance to widening a band thereof can be eliminated as much as possible.

The invention discloses an antenna structure and a designing method thereof, wherein the antenna structure comprises a line array radiating unit and an electric feeding network. The electric feeding network has an axis symmetric structure. The electric feeding network comprises an equal-power and unequal-power substrate integrated waveguide power divider and a substrate integrated waveguide phase shifter. The radiating unit is connected with the end of the axis symmetry substrate integrated waveguide feeding network. The antenna of the invention realizes a middle-and-long-distance integrated antenna based on the substrate integrated waveguide structure. The antenna can simultaneously satisfy requirements for testing the middle distance and the long distance of a radar, and switching between a plurality of transmitting antennae by means of a switch is not required. Furthermore the antenna structure has advantages of compact structure, low cost, small dimension, etc.

The invention provides a full-closed loop automatic tuning control device for improving stray isolation degree between antennas, relates to the technical field of communication and particularly relates to an antenna. The full-closed loop automatic tuning control device comprises a plurality of communication components, wherein each communication component comprises an antenna, a transceiver and an antenna transfer switching module, at least one communication component comprises a tuning module, and the antenna transfer switching modules are directly connected with the antennas or connected with the antennas through the tuning module; the antenna transfer switching modules realize signal connection with transmitting ends and receiving ends of the transceivers through switching actions; the transmitting ends of the transceivers are connected with a standing wave detection module, and the receiving ends of the transceivers are connected with a signal detection module. By monitoring the state of reflection power, the radiation efficiency of the antennas is not reduced; meanwhile, by detecting the strength of received signals, the isolation degree between the antennas is known, and the tuning module is further adjusted to continuously enable the sending efficiency and the stray isolation to achieve the best balance; thus, the requirements of mobile terminals, namely the two-way antennas on radiation performance are met, and the anti-interference capability between systems is improved.

The invention discloses a stretchable antenna and a preparation method thereof. The stretchable antenna comprises a stretchable ground plane, a stretchable base plate, and a conductive patch, whereinthe stretchable base plate is arranged on the stretchable ground plane; the conductive patch is arranged on the stretchable base plate in a bending mode so as to form at least one arch-shaped structure with the stretchable base plate. According to the stretchable antenna and the preparation method thereof provided by the embodiment of the invention, the stretchability of the antenna can be ensured; due to the fact that the traditional metal material is adopted for the conductive patch and the ground plane, the conductivity of the antenna is not reduced, and the radiation efficiency of the antenna is not reduced, which is proved by experiment.

The invention discloses an antenna module and radiation efficiency adjustment method, and the antenna module is applied to electronic devices. The antenna module comprises a sensor, an antenna body and a swtiching unit. The antenna body comprises a first grounding path and at least one second grounding patch. The sensor is equiped in the electroic device and is adjacent to the antenna body for sensing the distance of the user. The switching unit couples the sensor and the second grounding path for switching electric connection or disconnecting the second grounding path according to distance between the antenna module and the user, thereby the antenna body grounds at least one second grounding path or first grounding path using the frist connecting path. In the condition that the design freedom degree is maintained and the production cost is controlled, the product can accords with telecommunication act and security regulation.

[Summary][Object] To suppress warpage of a ceramic substrate, and to prevent a reduction in radiation efficiency.[Means for Settlement] A power semiconductor module includes a module casing fitted with a radiator, and a common unit retained by the module casing. The common unit has: a ceramic substrate having a circuit surface disposed with a semiconductor element, and a radiation surface brought into abutting contact with the radiator; and a package formed by exposing the radiation surface and sealing the circuit surface with heat resistant resin. The circuit surface and the radiation surface are respectively formed of metal layers 51 formed on the ceramic substrate, and the metal layer 51 forming the radiation surface has: by forming a buffer pattern 512 including a groove part extending along a circumferential part thereof, a radiation pattern 510 formed on an inner side of the buffer pattern 512; and an outer peripheral pattern 511 formed on an outer side of the buffer pattern 512. Such a configuration enables warpage of the ceramic substrate to be suppressed, and a reduction in radiation efficiency to be prevented.

The present invention provides an acoustic material structure and assembly method of an acoustic material structure and an acoustic radiation structure. The acoustic material structure includes acoustic units and openings; the acoustic units are attached to the surface of the acoustic radiation structure; the acoustic unit comprises a sheet; cavities are defined between the sheets and the acousticradiation structure; the openings pass through the acoustic units respectively; one end of the opening is communicated with the corresponding cavity; the opening can reduce the spring effect of a medium in the cavity, so that the acoustic unit enables a low frequency sound insulation effect even if being attached onto the surface of the acoustic radiation structure; the acoustic unit may also comprises a supporting body, a mass block and a constraining body; the operating frequency of the acoustic unit can be adjusted through the supporting body, the mass block and the constraining body; theacoustic material structure can well suppress the sound energy radiation of large wavelengths in middle and low frequency bands with low weight and low space cost ensured; and the vibration of the sheets can be utilized to enhance the exchange rate of the medium attached to the surface of the acoustic radiation structure, and therefore, through-flow heat dissipation performance can be improved.

The invention relates to a circular polarization frequency express substation small antenna based on a capacitive loading parasitic ring. The antenna comprises two monopole radiation metal strips, two orthometric capacitance loading parasitic rings, a variable capacitance diode frequency adjusting unit, a strip-shaped feeder line, a ground plate and two protractor-shaped dielectric-slabs being orthometric to each other; two parasitic rings are respectively located on two protractor-shaped dielectric-slabs being orthometric to each other, the monopole and the parasitic rings are respectively mounted on the front surface and rear surface of the dielectric-slab, the dielectric-slab is vertical to the ground plate; the variable capacitance diode is loaded in the gap between two parasitic rings, each parasitic ring is connected to two inductors, the positive electrode and the negative electrode of the external DC source of the variable capacitance diode are connected to inductors respectively, the strip-shaped feeder line is connected to the bottom end of each monopole radiation metal strip. The antenna uses the inductors for isolating the impact to the DC source driving variable capacitance diode from the alternating current on the parasitic rings, adopts the near field resonant parasitic oscillator technology for naturally isolating DC source and feeder source connected to the antenna and guarantees stability and higher radiant efficiency for the antenna radiation field.

The present invention provides a semiconductor laser device having a high reliability and desirable temperature characteristics while being a high-power device. An active layer, and two cladding layers sandwiching the active layer therebetween are formed on a substrate. One of the cladding layers forms a mesa-shaped ridge, and the ridge includes a waveguide region diverging into at least two branches. With this configuration, the density of carriers injected into the rear facet portion of the active layer is decreased, whereby it is possible to improve the temperature characteristics of the semiconductor laser. While the device includes a region across which the ridge bottom width varies continuously, the ridge bottom width is constant near the facet.

The invention discloses a liquid patch antenna. The liquid patch antenna comprises a medium base plate which is provided with a metal floor, an exciting end port, a metal probe, a nonmetal radiation patch in which liquid is poured, and a nonmetal short circuit patch in which liquid is poured, wherein the nonmetal short circuit patch is vertically fixed to the metal floor; one end of the nonmetal short circuit patch is connected to the metal floor to form an earth short circuit, and the other end of the nonmetal short circuit patch is connected to the nonmetal radiation patch which is parallelto the metal floor; the nonmetal short circuit patch and the nonmetal radiation patch form an inverted L-shaped structure; liquid in the nonmetal short circuit patch is communicated with the liquid inthe nonmetal radiation patch; one end of the metal probe passes through the medium base plate and then extends into the nonmetal radiation patch, and the other end of the metal probe is equipped withthe exciting end port; and the metal probe is parallel with and close to the nonmetal short circuit patch without direct contact. The liquid patch antenna has the characteristics of being high in radiation efficiency, high in gain, high in impedance bandwidth and universal radiation, and the working frequency ranges from 2.26-3.24GHz.

An antenna and a method of manufacturing the antenna are provided. The antenna may include an antenna surface, a ground plane, and an air layer comprising a porous structure.

An electronic device includes: a resin substrate that includes insulation resin on which wiring made of conductive material is provided; a heat-generation element that is a circuit element mounted on a first surface of the resin substrate, and is operated to generate heat; and a sealing resin that is provided on the first surface, and seals the heat-generation element. An opposite surface of the sealing resin opposite to a surface of the sealing resin in contact with the first surface is thermally connected to a heat radiation member and mounted on the heat radiation member. Each of the resin substrate and the sealing resin has a bend shape convex toward the opposite surface when each of surrounding temperatures is a normal temperature and has a linear expansion coefficient for maintaining a bend shape convex toward the opposite surface when each of the surrounding temperatures is a high temperature.

The present invention improves the reliability of a display apparatus by suppressing the temperature rise of the display apparatus mounted on a wall. The display apparatus is provided with a wall mount switch to detect a wall mount member if the wall mount member is attached to the rear of the display apparatus. If it is detected by the wall mount switch that the display apparatus is mounted on a wall, the display power supplied to a display unit is set lower than normal by a power controller. This suppresses the temperature rise of the apparatus mounted on a wall.

The invention discloses a miniature antenna unit capable of controlling wave beam widths and a large-scale antenna array capable of controlling wave beam widths. The miniature antenna unit comprises a radiation plate, a dielectric layer, a micro-strip slot antenna substrate and a reflecting cavity; the dielectric layer is arranged between the radiation plate and the front surface of the micro-strip slot antenna substrate; the dielectric constant of the dielectric layer is greater than that of air; the micro-strip slot antenna substrate is a high-dielectric-constant substrate; and the dielectric constant of the high-dielectric-constant substrate is greater than 3.5; and the reflecting cavity is formed in the reverse surface of the micro-strip slot antenna substrate. The miniature antenna unit and the large-scale antenna array are small in size, and the wave beam widths can be controlled by changing the dielectric constant of the dielectric layer in the antenna unit and the dielectric constant of the high-dielectric-constant substrate.

The invention discloses a tensile antenna and a preparation method thereof. The tensile antenna comprises a ground plane, a tensile substrate and a tensile conductive paster, wherein the ground planeis provided with a first net structure; the tensile substrate is arranged on the ground plane; and the tensile conductive paster is arranged on the tensile substrate. According to the tensile antennaand the preparation method thereof, the tensility of the antenna can be ensured; and the conductive paster and the ground plane adopt traditional metal materials, so that the conductivity of the antenna is not reduced, and an experiment confirms that the radiation efficiency of the antenna is not reduced.

The present invention relates to an LED illumination apparatus and a manufacturing method thereof. The LED illumination apparatus according to one embodiment of the present invention comprises: a body in which a heat sink including a plurality of heat radiation fins is formed in a first area of a bottom surface portion thereof and in which a light source loading area is formed in a second area different from the first area in the bottom surface portion; a substrate loaded on the light source loading area of the body; and an LED light source module provided on the substrate. According to the present invention, since the heat sink is formed in the bottom surface portion of the body, the reduction of heat radiation efficiency in the LED illumination apparatus due to dust or excrement of birds and the like can be minimized. In addition, since the body is manufactured by extrusion molding, the manufacturing cost of the LED illumination apparatus can be remarkably reduced in comparison with prior die casting. In addition, since the length of the body can be adjusted arbitrarily, the present invention can be designed in various shapes according to a desired heat radiation area.

The invention discloses a patch phased-array antenna with high radiation efficiency and low scattering characteristics, and belongs to the technical field of antenna engineering and the technical field of radar stealth. According to the invention, the bandwidth of the antenna is increased by adopting the laminated patches; the isolation between the circuit and the antenna is increased through different layers of feed patches, matching circuits and grounding plates arranged therebetween, so that the circuit and the antenna can be independently designed; an optimal load impedance curve for realizing zero back scattering in a band is solved from the scattering mechanism of the phased-array antenna, and finally fitting design of a corresponding matching circuit is performed, so that the RCS of a single station in the band of the antenna is remarkably reduced. In the unit selection and design, an antenna unit with low structural item scattering is selected, or proper structural item scattering reduction is carried out, so that the broadband reduction of the single-station RCS can be realized on the premise of ensuring that the antenna does not deteriorate the standing wave and does not reduce the radiation efficiency.

An electronic apparatus is provided. The electronic apparatus includes a housing which comprises a front surface plate, a rear surface plate oriented in the opposite direction to the front surface plate, and a side surface member surrounding the space between the front surface plate and the rear surface plate, at least a portion of the side surface member including at least one conductive section positioned between a first non-conductive section and a second non-conductive section which are spaced apart from each other, a conductive extended portion part extending from at least a partial area of the conductive section to the space, a printed circuit board disposed in the space, and a wireless communication circuit disposed on the printed circuit board and electrically connected a point which is in the conductive section and spaced toward a first location from the first non-conductive section.

The invention discloses a small-loop antenna for ultra-high-frequency detection of partial-discharge. The small-loop antenna comprises a dielectric layer, a conductor layer, a matching resistor and a feed terminal, wherein conductors are uniformly wound on the surface of a magnetic core; and the feed terminal is in parallel connection with the matching resistor and is used for feeding in a coaxial feeding manner. The small-loop antenna disclosed by the invention has the advantages of good directivity, wide frequency band, small standing-wave ratio and convenience in impedance matching, thus being capable of meeting the requirements on the online-monitoring ultra-high-frequency detection of the partial discharge in a power transformer.

The present invention efficiently radiates heat generated by a coil while suppressing a decrease in the efficiency of generation of magnetic fields caused by an eddy current. The present invention includes a coil extending spirally in a plane and covered with a dielectric material, a magnetic substance provided parallel with the plane so as to overlap the coil, and a radiator extending in the plane so as to surround the coil and having projecting portions which project toward an outermost periphery of the coil and groove portions recessed in a direction opposite to that in which the projecting portions project, the projecting portions and the groove portions being alternately arranged, the radiator having a higher thermal conductivity than the magnetic substance.

The present invention improves the reliability of a display apparatus by suppressing the temperature rise of the display apparatus mounted on a wall. The display apparatus is provided with a wall mount switch to detect a wall mount member if the wall mount member is attached to the rear of the display apparatus. If it is detected by the wall mount switch that the display apparatus is mounted on a wall, the display power supplied to a display unit is set lower than normal by a power controller. This suppresses the temperature rise of the apparatus mounted on a wall.

The invention relates to a broadband spatial coherence thermal radiation light source, comprising a metal structure layer, a medium layer and a lower base plate metal layer, wherein the lower base plate metal layer is a supporting layer and a thermal conductive layer, and the medium layer and the planar metal structure layer are sequentially overlapped on the lower base plate metal layer from down to up. The metal structure layer is composed of one-dimensional or two-dimensional arrays arranged in a metal unit period, a low-leakage coherent magnetic resonance surface state formed by the metalstructure layer, the medium layer and the lower base plate metal layer in the invention controls coherence of thermal radiation, and the frequency can be adjusted by cycle length. And the coherent magnetic resonance surface state in the invention is leaked to a free space by virtue of a metal slot on the upper surface, thus the ratio of width of the metal slot to a period determines coherence length. The broadband spatial coherence thermal radiation light source provided by the invention has simple structure and low cost, is convenient to manufacture and is easy to realize.

The invention discloses an N * M NMOSFET (N-channel Metal Oxide Semiconductor Field Effect Transistor) terahertz array detector based on DRA (Digital Radiography Analysis). The N * M terahertz detector array is connected with one end of a first blocking capacitor; the other end of the first blocking capacitor is connected with one end of a second bias resistor; the other end of the second bias resistor is connected with a second bias voltage; the second bias resistor is also connected with the positive electrode of the low-noise pre-amplifier; two ends of the first resistor are respectively connected with the negative electrode and the output electrode of the low-noise pre-amplifier; one end of the first resistor is further connected with one end of the second resistor, the other end of the second resistor is connected with one end of the second blocking capacitor, the other end of the second blocking capacitor is grounded, the other end of the first resistor is connected with one endof the third blocking capacitor, and the other end of the third blocking capacitor is grounded. Compared with the prior art, the technical scheme of the invention effectively improves the imaging resolution of the terahertz detector.

An electronic device is provided. The electronic device includes a display having a first surface, a metal frame structure configured to form a side surface of the electronic device, a rear plate having a second surface facing a third direction, at least one antenna module disposed inside the side surface and having a radiation surface, at least one dielectric layer having at least a partial region attached to the radiation surface, and a wireless communication circuit configured to transmit or receive an radio frequency (RF) signal to or from the at least one antenna module, in which the at least one dielectric layer includes a first dielectric sheet and a second dielectric sheet, in which the first dielectric sheet is made of a thermal conductive material having a first permittivity and the second dielectric sheet is made of a material having a second permittivity larger than the first permittivity.

The invention discloses an NMOSFET terahertz detector based on a dielectric resonant antenna, which comprises an on-chip dielectric resonant terahertz antenna, wherein the on-chip dielectric resonantterahertz antenna is connected with a matching network, the matching network is connected with a source electrode of the NMOSFET, a grid electrode of the NMOSFET is sequentially connected with a firstbias resistance and a first bias voltage, a third transmission line is connected with the first bias resistance and the grid electrode, a drain electrode of the NMOSFET is connected with a first blocking capacitor, the other end of the first blocking capacitor is connected with a low-noise pre-amplifier, a second bias resistance and a second bias voltage are further connected between the first blocking capacitor and the low-noise pre-amplifier in parallel, and the low-noise pre-amplifier is further provided with a voltage feedback circuit. The invention further discloses a design method of the on-chip dielectric resonant terahertz antenna. Compared with the prior art, the technical scheme of the invention effectively reduces the loss of the on-chip terahertz antenna and improves the gainand radiation efficiency of the on-chip terahertz antenna.

An electronic device for minimizing parasitic emission is provided. The electronic device includes a housing including a front cover, a rear cover located on the opposite side of the front cover, and a lateral member surrounding a space between the front cover and the rear cover, the lateral member having a first conductive portion formed on at least a portion thereof, a support member disposed in the space of the housing and including a second conductive portion having therein at least one opening, a display including a conductive sheet that is disposed between the front cover and the support member so as to be visible from an outside through at least a part of the front cover and is disposed to face the support member, and a wireless communication circuit electrically connected to the first conductive portion. The conductive sheet includes a first portion, a second portion disposed adjacent to the first portion, and a coupling that is partly connected between the first portion and the second portion. In case the front cover is viewed from above, the coupling is disposed at a position overlapping the opening.