GERMANY: WISI, renowned Tier-1 supplier of automotive antennae and IMST, renowned specialist for antennae and wireless communication agreed upon a strategic partnership to develop an intelligent roof antenna for motor vehicles.
"This partnership gives us access to the excellent know-how of the IMST engineers in antenna technologies and communication systems," says Dr. Rüdiger Czolk, sales director at WISI Automotive. "For IMST the cooperation is an excellent opportunity to transfer innovative solutions from its pre-development and research projects into series products" explains Norbert Schmidt, head of Department Information and Communications Systems at IMST.
The intelligent roof antenna is a multi-band antenna system that integrates the services GSM/3G/LTE, GPS and Car-to-Car (C2C) into a single module. In addition to the passive antenna elements for the named services, the module includes the entire electronic components like microcontroller, memory, and signal processing for C2C. Due to the complete integration of the service into a single module the interconnection with the vehicle architecture is purely digital via Ethernet and avoids – especially for 5.9 GHz – using lossy coaxial cables.
At such high frequencies in a vehicle environment, even on the exposed roof position signal drops due to shadowing and multiple reflections are expected. Therefore this architecture provides the ability to connect a second module placed at an alternative position to the main module.
The radiation characteristics of the additional module can be tailored to the particular position. This distributed system enables antenna diversity and thus provides an optimal omnidirectional combined radiation pattern. Maximum transmission range and thus a significant increase in traffic safety can be guaranteed.