36results about How to "Guaranteed Radiation Efficiency" patented technology

The present application provides a terminal with a common radiator antenna. The terminal includes a non-grounded metal frame, a first feed source, a second feed source, a first metal body, a second metal body, a first control switch, and a second Control switch; the first signal end of the first control switch is respectively connected to the first metal body and the non-grounded metal frame, and the second signal end of the first control switch is used to connect to the first feed source of the terminal and to control the first feed source The signal connection between the first metal body and the non-ground metal frame; the first signal end of the second control switch is respectively connected to the second metal body and the non-ground metal frame, and the second signal end of the second control switch is used to connect The second feed source of the terminal is used to control the signal on-off between the second feed source and the second metal body and the non-grounded metal frame. The antenna terminal with a common radiator provided by the present application ensures the radiation efficiency of multiple antennas with a common radiator in the terminal, and realizes high isolation between multiple antennas with a common radiator.

The invention provides an electronic device, which includes a metal casing, a first opening, a first metal wiring, a first grounding point and a first current zero point. The first opening runs through the metal casing. The first metal wiring is located in the first opening, and the first end of the first metal wiring is electrically connected to the side of the first opening, and the second end of the first metal wiring has a first feeding point. The first ground point and the first current zero point are located on the side of the first opening. The metal shell utilizes the first exciting path from the first feeding point to the first grounding point to form a first loop antenna to receive or transmit a first radio frequency signal.

The invention relates to a loudspeaker box structure which comprises a loudspeaker and a loudspeaker box cavity, wherein the loudspeaker is arranged in the loudspeaker box cavity; the loudspeaker box cavity comprises a reversed cavity unit and a positive cavity unit; the reversed cavity unit is connected with the positive cavity unit; the loudspeaker is arranged between the reversed cavity unit and the positive cavity unit; the reversed cavity unit comprises at least one reversed resonant cavity; and the positive cavity unit comprises at least one positive resonant cavity. A positive radiating sound wave of the loudspeaker is transmitted after being resonated and tuned by the positive cavity unit; meanwhile, the reversed radiating sound wave of the loudspeaker can be transmitted after being resonated and tuned by the reversed cavity unit. The frequency lower limit of the resonated and tuned radiating sound wave is far lower than the lower limit of the reversed radiating sound wave andthe positive radiating sound wave of the loudspeaker; the number of the positive resonant cavities and the reversed resonant cavities is adjusted so that the two sound saves are laminated in same phase; and the invention ensures the radiating efficiency of the loudspeaker box, reduces the low-frequency playback lower limit of the loudspeaker box, improves the sound quality and has the advantages of smaller caliber of the loudspeaker and smaller size of the loudspeaker box.

The invention proposes a low radar scattering cross-section reflection array antenna, which mainly solves the problems of the existing radar scattering cross-section reduction frequency band and narrow angle range of the reflection array antenna. It includes a feed source (1) and a reflection front (2) located below the feed source, the reflection front includes M×N reflection units (3) with the same structure and different parameters, each reflection unit includes four dielectric substrates And the metal surface printed on each medium substrate, each metal surface is composed of upper and lower metal branches and metal branches, wherein the upper metal branch is composed of three metal patches, and the lower metal branch is composed of five metal patches Composition, four dielectric substrates are laminated in pairs to form two laminated dielectric substrates (31, 32), and the two laminated dielectric substrates are placed vertically to form a cross-shaped structure. While ensuring the radiation efficiency of the reflection array antenna, the invention realizes the reduction of the radar scattering section in the range of wide frequency band and wide angle domain, and can be used in various long-distance wireless communication systems.

The application discloses an electronic device, which belongs to the technical field of antennas. The electronic device includes: a metal middle frame, a sound cavity shell, a sound cavity metal body, a sound cavity metal support piece and a feed source. The sound cavity shell is fixed on the metal middle frame, the sound cavity metal body and the sound cavity metal support sheet are arranged in the inner cavity of the sound cavity shell at intervals, and the sound cavity metal body is insulated from the metal middle frame. The feed source is used to feed the excitation signal into the metal body of the sound cavity to excite the metal body of the sound cavity to resonate at the first resonant frequency, and the excitation signal is also coupled to the metal support of the sound cavity through the gap between the metal body of the sound cavity and the metal support plate of the sound cavity plate to excite the metal support plate of the sound cavity to resonate at the first resonant frequency. In the present application, when the feed source feeds the excitation signal to the metal body of the sound cavity, the electronic device can be in the working mode of a microstrip antenna with a working wavelength of 1 / 2, which ensures the efficient radiation and directivity of the electronic device.

The invention discloses a miniaturized broadband antenna, which comprises a radiator, an insulating medium substrate and a metal back cavity; the metal back cavity is a U-shaped cavity formed by a lower bottom surface and two left and right opposite side walls; the insulating medium substrate covers the The opening of the upper top surface of the metal back cavity; the radiator is printed on the upper surface of the insulating dielectric substrate in a planar shape; the radiator is composed of 2 fan-shaped units and 2 microstrip lines; the vertices of the 2 fan-shaped units form the radiator Feed point; two fan-shaped units are symmetrically distributed on the left and right sides of the insulating dielectric substrate, and the feed points of the two fan-shaped units are opposite and separated by a certain distance; each microstrip line is a curved and extended line; the microstrip The two ends of the line are respectively connected to the bottom end points on the same side of the two fan-shaped units; the two microstrip lines are symmetrically distributed on the front and rear sides of the insulating dielectric substrate. The invention can reduce the size of the antenna and meet the detection requirements of the system for the target.