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449 results about "Monopole antenna" patented technology

A monopole antenna is a class of radio antenna consisting of a straight rod-shaped conductor, often mounted perpendicularly over some type of conductive surface, called a ground plane. The driving signal from the transmitter is applied, or for receiving antennas the output signal to the receiver is taken, between the lower end of the monopole and the ground plane. One side of the antenna feedline is attached to the lower end of the monopole, and the other side is attached to the ground plane, which is often the Earth. This contrasts with a dipole antenna which consists of two identical rod conductors, with the signal from the transmitter applied between the two halves of the antenna.

Multi-frequency antenna system applicable to mobile terminal with metal frame structure

ActiveCN103346397AMetal Trim Frame Requirements RetainedMeet the needs of metal texture mobile terminal productsSimultaneous aerial operationsAntenna supports/mountingsResonanceCoupling
The invention discloses a multi-frequency antenna system applicable to a mobile terminal with a metal frame structure. The multi-frequency antenna system comprises a metal frame, a PCB and an antenna part. The metal frame is designed to be part of an antenna radiation body, two gaps are formed in the bottom portion of the metal frame, a feeding wiring part and the metal frame together form a T-shaped monopole antenna or an IFA antenna so that the metal frame itself can be used for producing low frequency and high frequency resonance, and other coupling parts can be additionally arranged to be used for adjusting the low frequency and high frequency resonance according to the needs of working frequency bands. The multi-frequency antenna system has the advantages that due to the fact that the gaps of the metal frame are formed in the bottom portion, a user can be prevented from touching the gaps during the actual use process, and the phenomenon that the performance of the antenna is poor when the antenna is held by a hand is avoided; the working frequency bands of the multi-frequency antenna system are 704Mhz-960Mhz and 1710Mhz-2700Mhz, and multi-frequency broadband is realized; compared with a traditional general antenna, the multi-frequency antenna system is multiple in frequency band and broad in frequency width; the antenna structure of the multi-frequency antenna system is small in occupied space, and mutual influence cannot be generated between the antenna structure and surrounding environments.

Three-dimensional omni-directional antenna designs for ultra-wideband applications

The present invention generally relates to the field of microwave antennas, and, more particularly, to a number of three-dimensional designs for the radiation element of an ultra-wideband monopole antenna with a symmetrical omni-directional radiation pattern operated in the frequency range between 3.1 GHz and 10.6 GHz. Said antenna is connected to the analog front-end circuitry of a wireless communication device used for transmitting and/or receiving microwave signals and meets the FCC requirements in terms of antenna gain, radiation pattern, polarization, frequency bandwidth, group delay, and size. It comprises a radiation element consisting of an air- and/or dielectric-filled cavity structure with a base plane and a radiator plane. A metallic ground plane having a relatively high surface impedance to electromagnetic waves within said frequency range, which is printed on a dielectric substrate, serves as a reflector. The monopole antenna further comprises an antenna feeding circuitry used for electronically steering the symmetrical omni-directional radiation pattern and a feeding line connecting the antenna feeding circuitry with the base plane of the radiation element. Thereby, parts of the analog front-end circuitry can optionally be placed within the air-filled part of the radiation element of the antenna. The proposed designs include a radiation element having the form of a truncated right circular cone, rotational-symmetric radiation elements with a convexly- or concavely-shaped 3D surface, respectively, a radiation element in the form of a truncated right regular pyramid with a square base plane, and radiation elements with a combined structure comprising a conical, pyramidal, convexly- or concavely-shaped first part and a closed cylindrical or cuboidal second part whose top plane is arranged on top of the congruent base plane of said first part. Further embodiments include radiation elements with the form of a radially notched cylinder or hemisphere as well as combined structures consisting of at least two convexly-shaped elements or two conical parts, respectively, stacked on top of each other.

Mobile communication terminal antenna device

InactiveCN102800931ASolve large metal partsSolve the problem of antenna coexistenceSimultaneous aerial operationsAntenna supports/mountingsTelecommunicationsEngineering
The invention discloses a mobile terminal antenna device which comprises a metal frame arranged on a mobile communication terminal shell, a first radiating body and a second radiating body arranged on an antenna carrier and a main circuit board arranged in a mobile communication terminal, wherein a main earth point on the main circuit board is connected with the metal frame; the first radiating body is provided with a coupling gap and is connected with a radio-frequency feed source on the main circuit board via a conducting connector, and an earth point on the first radiating body is connected with the metal frame via a conducting connector; and the second radiating body as a double-grounded parasitic antenna branch of the antenna device is used for expanding low-frequency bandwidth. The mobile terminal antenna device is a coupled feed-in type monopole antenna device. Compared with the prior art, the mobile terminal antenna device has the advantages of ultralow low-frequency bandwidth, good antenna performance, high efficiency and the like, the problem that a large metal part of the mobile communication terminal and the antenna coexist is also well solved, and the metal texture of the appearance of the mobile communication terminal is better ensured on the shape.
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