Takano T.,System and Electronics Division |
Nakaue S.,System and Electronics Division |
Yamagishi S.,System and Electronics Division |
Matsuno H.,KDDI |
SEI Technical Review | Year: 2013
Antennas for mobile communication base stations need to support a wide range of frequency bands, including 800 MHz, 1.5 GHz and 2.0 GHz, while also responding the demand for polarization diversity and size reduction for easier installation. We have developed a triple-band polarization diversity antenna using loop elements, which successfully reduces the antenna size by about 60% compared with the conventional dipole antenna.
Taniguchi Y.,System and Electronics Division |
Oota T.,System and Electronics Division |
Kobayashi M.,System and Electronics Division |
Urayama H.,Inforcommunications and Social Infrastructure System R and nter |
Koreeda Y.,Sumitomo Electric
SEI Technical Review | Year: 2014
We are striving to develop the Driving Safety Support System (DSSS) that aims to prevent accidents by providing drivers with necessary information for safe driving. We developed a DSSS with infrared (IR) beacons, which has been practically used since July 2011. Now, we have shifted our target to the development of a DSSS with an intelligent transport system (ITS) radio system that can provide sensor data and other dynamic information that is not available with IR beacons. This paper describes the requirements for the DSSS with an ITS radio system, such as communication area and sensor detection area, and presents the result of a verification test.