108 results about "Electromagnetic reflection" patented technology

The present invention comprises systems and methods for cellular, PCS, GPS and / or Bluetooth mobile communication (e.g., a mobile telephone). The systems and methods employ a fully integrated dual band IFA / loop CDMA antenna for cellular and PCS communication. Fully integrating the CDMA antenna within a PWB provides for mitigation of lumped elements to establish dual banding, and can provide for reduced antenna size, device size, cost and interference form a user's hand. The IFA antenna is configured to transmit and receive within the cellular frequency band via a capacitive tap, and the loop antenna is configured to transmit and receive within the PCS frequency band via an impedance matching stub and ground location. The system and methods further employ a firewall to mitigate antenna coupling, and a metal reflector to reduce the electromagnetic reflection, and improve antenna gain and efficiency.

An electromagnetic shielding system for shielding a user's head from electromagnetic waves produced from an antenna of a cellular phone. The electromagnetic shielding system includes an expandable shield assembly that includes a base panel and an arm panel pivotally coupled together for providing an expanded area of coverage for a user's head. The base panel is removably mountable to the antenna of a cellular phone. An electromagnetic reflective member is mounted to the shield assembly for shielding a user from the electromagnetic waves. A coupling assembly is removably mountable to and extends between the shield assembly and the antenna of the cellular phone for positioning the expandable shield assembly between a stored position and a shielding position.

The present invention relates to a method of verifying a measurement accuracy of a level gauge system. The method comprises determining a first measurement value indicative of a time-of-flight of a first electromagnetic reflection signal to a reference reflector and back; determining a measurement unit verification measurement value based on a response signal from a verification arrangement; determining a second measurement value indicative of a time-of-flight of a second electromagnetic reflection signal to the reference reflector and back; and determining a verification result based on the first measurement value, the second measurement value and the measurement unit verification measurement value. Through embodiments of the present invention, it will be verified that the measurement unit is functioning correctly and that level gauge system works as it should also after being reconnected to the propagation device.

Besides a plurality of base stations (64) enabling telephone calls between mobile terminals (30) and between the mobile terminals (30) and fixed telephones (12), a call management apparatus (60) is further provided a broadcasting station (72) that transmits call origination information via a broadcasting station carrier of a frequency band that is lower than that of a telephone call carrier. Furthermore, each mobile terminal (30) is provided with a broadcasting station carrier receiver portion capable of receiving broadcasting station carriers. An exchange control station (70) transmits call origination information from the broadcasting station (72) via a broadcasting station carrier if a mobile terminal (30) is in a state in which it is incapable of transmission / reception via the telephone call carrier. Since broadcasting station carriers have a better electromagnetic reflection characteristic than telephone call carriers, each mobile terminal (30) can receive call origination information by using the broadcasting station carrier receiver portion even if the mobile terminal (30) is in a state in which it is incapable of transmission / reception via the telephone call carrier. Thus, the communication of call origination information to the mobile terminals (30) can be improved.

The invention discloses an ultrahigh frequency radio frequency identification device and a system thereof, wherein the ultrahigh frequency radio frequency identification device is used for identifying an RFID tag on an object to be identified and comprises: a signal control unit with an opening on the top surface thereof and electromagnetic reflection material at the side surface and the bottom surface thereof; a platform, arranged on the top surface of the signal control unit and used for receiving the object to be identified; an UHF RFID antenna, arranged in the signal control unit; and an UHF RFID reader for reading the data of the RFID tag through the UHF RFID antenna. The ultrahigh frequency radio frequency identification device and the system thereof according to the invention can accurately read the RFID tag on the objects to be identified in order to avoid the erroneous reading of the RFID tag.

There are provided a soft magnetic material in the form of particles for suppressing occurrence of electromagnetic interference which is capable of exhibiting the suppressing effect in a broad frequency range from a low frequency band to a high frequency band, as well as an electromagnetic interference suppressing sheet using the material. When a conductive magnetic filler prepared by mixing a conductive carbon with soft magnetic particles at a volume ratio of 3 to 10:50 to 70 is highly filled in a sheet material, there can be obtained an electromagnetic interference suppressing sheet which is suitable for high-density mounting to electronic equipments, has an excellent electromagnetic absorption in a near electromagnetic field, and is fully suppressed from undergoing electromagnetic reflection thereon.

The invention discloses an electromagnetic shielding curved-surface optical window based on an ultrathin doped metal / medium composite structure, belonging to the field of electromagnetic shielding of optical transparent parts. According to a curved-surface transparent electromagnetic shielding device in the invention, a dielectric film and an ultrathin metal film are sequentially deposited on a curved-surface substrate to form a composite structure, a high-quality doped metal film with a continuous surface and extremely low roughness is obtained under an ultrathin thickness condition by utilizing a co-doping deposition method, and a novel solution is provided for electromagnetic shielding of a large-size curved-surface light window. The thickness of the ultrathin doped metal film and the dielectric film is less than dozens of nanometers and is far less than the microwave band electromagnetic wave wavelength, so stable strong electromagnetic reflection can be provided, electromagnetic shielding bandwidth is greatly widened, and the problem that the electromagnetic shielding bandwidth of a metal mesh structure is seriously limited due to periodic trepanning is solved. Meanwhile, the light transmittance and the electromagnetic shielding efficiency of the composite structure are controlled by regulating and controlling the number of ultra-thin metal / medium units, and strong electromagnetic shielding in a broadband range is achieved. Furthermore, by designing a combination of the thickness of the ultrathin doped metal and medium units and the number of the units, the coupling transmission of visible light by the composite structure is realized, and good optical permeability is realized.

Provided is a thermoplastic resin composition for a radar cover which exhibits excellent mechanical properties as well as a good balance between electromagnetic reflection loss and electromagnetic penetration loss, which is required for a radar protection, by including 85 wt % to 95 wt % of a thermoplastic resin, 1 wt % to 5 wt % of carbon nanotubes, and 3 wt % to 10 wt % of carbon black, wherein a weight ratio of the carbon nanotubes to the carbon black is in a range of 3:7 to 1:7.

A radar level gauge system, comprising a transceiver; an antenna arrangement configured to transmit an electromagnetic transmit signal from the transceiver, and to return an electromagnetic reflection signal resulting from reflection of the transmit signal at a surface of the product back towards the transceiver; and processing circuitry. The antenna arrangement comprises: a dielectric antenna body having a transmit signal receiving surface to receive the transmit signal from the transceiver, a convex transmit signal emitting surface configured to direct the transmit signal towards the product following passage of the transmit signal through the dielectric antenna body, and a side surface connecting the transmit signal receiving surface and the transmit signal emitting surface; and an electrically conductive antenna housing covering at least a portion of the side surface of the dielectric antenna body. The dielectric antenna body is arranged to conductively separate the transceiver from the conductive antenna housing.

A radar level gauge system, comprising a transceiver; an antenna arrangement configured to transmit an electromagnetic transmit signal from the transceiver, and to return an electromagnetic reflection signal resulting from reflection of the transmit signal at a surface of the product back towards the transceiver; and processing circuitry. The antenna arrangement comprises: a dielectric antenna body having a transmit signal receiving surface to receive the transmit signal from the transceiver, a convex transmit signal emitting surface configured to direct the transmit signal towards the product following passage of the transmit signal through the dielectric antenna body, and a side surface connecting the transmit signal receiving surface and the transmit signal emitting surface; and an electrically conductive antenna housing covering at least a portion of the side surface of the dielectric antenna body. The dielectric antenna body is arranged to conductively separate the transceiver from the conductive antenna housing.