417 results about "Antenna efficiency" patented technology

A multiband antenna with removed coupling includes a radiator formed as a meander line bent zigzag several times and having a gap filling part in at least one area between neighboring meander lines. The gap filling part interconnects the neighboring meander lines. The multiband antenna further includes a ground connected with the radiator and at least one switch element mounted in an area along the longitudinal direction of the radiator and configured to alternately short or open an area of the radiator. Accordingly, two different resonance frequencies can be tuned using the single antenna, and the antenna efficiency can be enhanced by removing the coupling between the resonant frequencies that are tuned through the gap filling.

A multiband planar inverted F antenna (PIFA) can provide improved performance and operating efficiency, and utilizes a capacitive element configured to provide high efficiency operation, and a tuning area that allows the antenna to be tuned independently of the capacitive element. As a result of this feature, the antenna can be tuned to the desired operating frequencies, while allowing the capacitive element to remain configured for optimal operating efficiency. The antenna can be configured in a loop for effective utilization of a given volume and can therefore be relatively small in size and high efficiency. A capacitive loading section can be included to allow improved antenna efficiency and radiation. Additionally, tuning section can be provided to allow the antenna to be tuned without adjusting the capacitive loading section. To obtain operation at an additional frequency band, a parasitic element or a slot configuration can be included.

The inventive device enables to ensure its compactness, that is, a minimum thickness at a high antenna efficiency of an antenna in the frequency range 10.7-12.75 GHz. This technical effect can be achieved because the antenna comprises a main reflector (1), at least two feeds (2) and at least two sub-reflectors (3). Each sub-reflector is provided with such a shape of its external surface that ensures reflection of the feed directional pattern central beam to the edge of the main reflector and reflection of a lateral beam to the central area of the main reflector, the sub-reflector adjoining surfaces being truncated.

A built-in antenna of a portable terminal and a method of forming the same are provided. The built-in antenna includes a first conductor having a specific length and used for a ground, a second conductor disposed with a specific distance in parallel to the first conductor to couple with the first conductor and used for power feeding, and a separating element disposed between the first conductor and the second conductor to separate the first and second conductors. Accordingly, the built-in antenna may exhibit a smooth radiation property even if a metal construction is used in a device and thus may implement robustness improvement of the device and make the device slim and have an attractive outer appearance. In addition, a method of improving antenna efficiency may prevent deterioration of the radiation property of the antenna radiator of the related art by using simple processing, and the metal construction may be used as a radiator.

The invention provides a circularly polarized waveguide flat plate array antenna, which has the advantages of high antenna efficiency and low manufacturing cost. A circular polarizer is arranged on a broadband linearly polarized waveguide flat plate array antenna 2 consisting of a rectangular open-ended waveguide 31 array excited by a waveguide feed network to achieve the high circularly polarized wave receiving and transmission capability of the circularly polarized waveguide flat plate array antenna. The size of the circular polarizer 1 is completely the same as that of a radiating layer 30, and consists of two layers of completely identical dielectric thin films 10 and a dielectric bulkhead 20 made from an acrylonitrile butadiene styrene (ABS) material, wherein an inclined cross pattern 11 is screen-printed on the dielectric thin film 10 by using conductive ink. Compared with a conventional circularly polarized flat plate antenna, the circularly polarized waveguide flat plate array antenna has the characteristics of great circular polarization bandwidth, low cost and low feeder loss.

This invention relates to a broadband single ridge waveguide slot array, resolving that the size, weight, loss, scanning angle and other aspects of existing waveguide slot array can not meet the special requirements. Its features are: the radiation waveguide has symmetric metal-single ridge on the center line of hemline and rectangular cross section, which connects with the feeding waveguide just below the bottom. The feeding waveguide has symmetric metal-single ridge on the hemline centerline. Coupling gap is set between radiation and feeding waveguide horizontally. The invention uses a single-ridge radiation waveguide to reduce the width of antenna, divides array into a number of sub-ones and feeds by power divider to improve the working bandwidth, uses ridge waveguide antenna to improve efficiency and reduce processing difficulties, uses coaxial connectors to easily realize impedance matching.

A method for improving the efficiency of antennas having transparent thin-film conductive surfaces, and antennas improved by the method are disclosed. For a selected frequency of antenna operation, values for surface current density in areas distributed over the surface of the thin-film are determined. Regions of the surface containing areas having concentrated current flow are identified based upon the determined values of current density. Antenna efficiency is improved by increasing conductivity in areas of the thin-film surface found to have concentrated current flow. The method enables the improvement of the efficiency of antennas having transparent thin-film conducting surfaces, without unnecessarily obstructing the optical view through the thin-film surfaces of the antennas.

The invention discloses a wireless communication device and a method for adjusting antenna matching. The wireless communication device comprises a main antenna, a diversity antenna, an adjustable matching circuit, a detection unit and a radio-frequency processing circuit, wherein the main antenna and the diversity antenna operate at a receiving frequency band to receive a received signal; the adjustable matching circuit is coupled with the main antenna and the diversity antenna, and used for adjusting matching of the main antenna and the diversity antenna according to a control signal; the detection unit is coupled with the adjustable matching circuit, and used for detecting a wireless communication system corresponding to the received signal to generate a detection result; the detection result indicates antenna configuration and a transmitting frequency band which correspond to the wireless communication system; and the radio-frequency processing circuit is coupled with the detection unit and the adjustable matching circuit, and used for judging whether to adjust the matching of the diversity antenna according to the antenna configuration indicated by the detection result to output the control signal to the adjustable matching circuit to allow the adjustable matching circuit to adjust the matching of the diversity antenna to meet the antenna configuration, and judging whether to weaken antenna efficiency of the diversity antenna. The wireless communication device can allow isolation between the two antennas to be optimized.

The invention discloses a low-profile one-dimensional active transceiving phased-array antenna for satellite communication in motion. The antenna comprises dual-linear-polarization antenna units in inclined and staggered arrangement, flat waveguide dual-channel feed networks, flat waveguide dual-channel miniaturized duplexers, waveguide transition and miniaturized TR components and miniaturized printed board power division networks. The units of the phased-array antenna are dual-linear-polarization waveguide radiators in triangularly inclined and rear-staggered arrangement, so that the antenna is low. By the aid of a method of sharing the same aperture for horizontal polarization and vertical polarization, aperture utilization efficiency of the antenna is increased, a flat waveguide feedback mode is adopted for both horizontal polarization and vertical polarization, loss of the feed networks is reduced, and quite high antenna efficiency is achieved. After passing through the antenna units, the feed networks and the duplexers, dual-polarization signals are subjected to polarization adjustment via polarization adjustment modules in the TR components and are synthesized via pitching surface networks so as to achieve a transceiving function of radio-frequency signals.

The hybrid antenna includes a spiral antenna, e.g. a log spiral antenna, and a patch array layer adjacent to the spiral antenna and including a passive periodic patch array of conductive patch elements. A conductive ground plane may be adjacent to the patch array layer, and a dielectric layer may be between the conductive ground plane and the patch array. The spiral antenna may include an upper antenna arm, a lower antenna arm and a dielectric sheet therebetween. Each of the upper and lower antenna arms may be a printed planar conductive trace that is wider at a distal end thereof with respect to a center of the log spiral antenna. The patch or periodic array layer operates in conjunction with the ground plane to couple energy into the spiral antenna and thereby improve low frequency antenna efficiency while maintaining electrically small dimensions.

A wireless communication device including an antenna-integrated module which realizes a high-end antenna having an improved antenna efficiency includes a mounting board having a through hole whose cross-sectional shape is rectangular; and an antenna-integrated module mounted on the mounting board so as to cover over the through hole, a patch antenna, which radiates radiation wave, being provided on a surface of the antenna-integrated module, which surface is exposed in the through hole, an annular grounding sheet being provided between the antenna-integrated module and the mounting board so as to surround the patch antenna, and the through hole having a longer side whose length satisfies lambda/2<=a<=lambda, where lambda is a wavelength of the radiation wave.

The invention provides an antenna circuit, a control method and a device of a mobile terminal. The antenna circuit comprises at least two antennas, wherein, each antenna is respectively connected withan antenna tuner; a radio frequency circuit electrically connected to a first antenna of the at least two antennas; a power detection module connected with a radio frequency circuit; a receiving path, wherein each of the at least two antennas other than the first antenna is connected to the receiving path through a switching switch, and each switching switch is connected to a power detection module; a controller respectively connected with the power detection module and the antenna tuner. Therefore, the scheme of the invention solves the problem that the isolation between the multiple antennas is too low and the antenna efficiency is poor.

The invention discloses a transmit-receive sharing dual-polarization waveguide array antenna, which comprises a dual-polarization antenna unit and a waveguide feed network, wherein the dual-polarization antenna unit is composed of a radiation port, a main waveguide, a transition waveguide, a vertical polarization waveguide, a horizontal polarization waveguide and a polarization switching waveguide. A method of a horizontal polarization and a vertical polarization sharing the same one aperture is utilized, so that the aperture utilization efficiency of the antenna is increased. The horizontal polarization and the vertical polarization adopt a waveguide feed mode, so that the loss of the feed network is reduced, and the antenna has high antenna efficiency. Two polarizations to a radiation unit adopt the same polarization feed mode, wherein the vertical polarization is direct feed, the radiation to the horizontal polarization adopts the vertical polarization feed, and the horizontal polarization of the radiation is realized through a waveguide step transition and slot-coupling mode.

A compact tunable antenna for a handheld electronic device and methods for calibrating and using compact tunable antennas are provided. The antenna can have multiple ports. Each port can have an associated feed and ground. The antenna design can be implemented with a small footprint while covering a large bandwidth. The antenna can have a radiating element formed from a conductive structure such as a patch or helix. The antenna can be shaped to accommodate buttons and other components in the handheld device. The antenna may be connected to a printed circuit board in the handheld device using springs, pogo pins, and other suitable connecting structures. Radio-frequency switches and passive components such as duplexers and diplexers may be used to couple radio-frequency transceiver circuitry to the different feeds of the antenna. Antenna efficiency can be enhanced by avoiding the use of capacitive loading for antenna tuning.

The invention provides a method and a device for laying out distributive sites. The method comprises the following steps of: acquiring first position information of users in a cell, wherein the first position information represents the position information of the users in a uniform distributive state; acquiring a distance function reflecting the users to distributive sites according to the first position information; and optimizing the distance function by taking the cell radius and the coverage range of the distributive sites as constraint conditions to acquire first layout positions of the distributive sites. The technical scheme of the invention does not depend on the antenna efficiency, thereby overcoming the dependence on the definition of the antenna efficiency. In the technical scheme, the distributive sites are laid out on the basis of the user positions and the cell information, which can guarantee that the distances between the users and the accessed distributive sites are the minimum so as to reduce the path loss between the users and the accessed distributive sites, and the emission power of the distributive sites can be reduced so as to reduce the system power consumption.