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*** For immediate use January 17, 2013
Tokyo, January 17, 2013 - NEC Corporation (NEC; TSE: 6701) has developed electromagnetic noise suppression technologies that improve the reception of antennas by as much as 10 times for high-speed wireless communications devices using internal printed circuit boards with NEC's independently developed artificial materials. These technologies improve the transmission performance of wireless devices and enable high-speed communications that are up to 2 times faster than that of devices without these technologies.
NEC's new electromagnetic noise suppression technology is an Electromagnetic Bandgap (EBG) structure that suppresses the electromagnetic wave transmission of particular frequencies using varieties of artificial materials (metamaterials, *1) that exhibit properties not found in nature. These properties are derived by periodically arranging certain metals.
A newly developed (micro) EBG structure achieves the world's smallest unit cell size, approximately 1/10 (*2) the size of existing cells, by introducing an open-stub resonator (*3) made up of spiral metal wire. As a result, EBG structure can be applied internally to circuit boards, which is difficult to accomplish with conventional technologies.
The communications performance of antennas for wireless communication devices is reduced by electromagnetic waves (electromagnetic noise) that are caused by devices on circuit boards then transmit within the circuit boards and radiate towards open space. These new technologies improve the reception sensitivity of antennas by up to 10 times more than conventional technologies by suppressing electromagnetic noise within circuit boards and preventing unnecessary emission of electromagnetic waves. As a result, transmission speeds are accelerated by as much as 2 times, enabling users to enjoy high quality video and content through high-speed wireless communications.
Key features of these new technologies include:
(*1) Materials that exhibit properties not found in nature by periodically arranging artificial components. A unit cell consisting of a dielectric or a conductor features a structure with a large number of arrangements in a short period when compared to the wavelength of electromagnetic waves.
(*3) A resonator that is formed by the distributed constant line (stub) opened by the tip of the wire. It is possible to reduce the area of these resonators when compared to existing LC resonators because their resonance frequency can be changed in response to the length of the metal wire.
(*4) A resonator consisting of inductance and capacitance. EBG structure requires a large area since the frequency of resonance is determined in response to the area of the metal plate that forms capacitance.