A lens antenna made with specialized glass, developed by Nippon Electric Glass (herein after "NEG"), has been used in a self-driving bus convoy experiment conducted in Shiga Prefecture, Japan. In this experiment, the lens antenna played a pivotal role in improving stable information transmission between buses in convoy, successfully addressing the challenges associated with conventional antennas used in standard mobile communication. This technology enables high-speed and high-capacity information communication through millimeter-wave communication.
Self-driving bus convoys, offering increased transportation capacity without the need for additional drivers, are being considered as a way to create region-specific transportation infrastructure and next-generation mobility services. The demonstration experiment aimed to achieve convoying and self-driving of multiple buses through information communication between the leading bus and its followers.
The use of lens antennas made with specialized glass has resolved issues such as communication interruptions during turns in self-driving bus convoying, offering more stable information transmission compared to conventional antennas. Furthermore, it has improved throughput and reduced latency compared to traditional antennas. The lens antenna using specialized glass was developed to meet requirements for self-driving bus convoying.
Key Requirements for Antennas
- Stable communication during turns
- Compact size for easy installation anywhere
- Resistance to deterioration caused by rain or snow
Advantages of NEG's Lens Antenna Using Specialized Glass
Customizable Beam Shaping for User Needs
In the demonstration experiment, a specialized glass material with suitable dielectric constant and low loss tangent is used for lens design. By reducing loss tangent, radio wave loss was minimized, and the lens shape could be adjusted to send radio waves in one direction or over a broader area.
Stable Communication Even During Turn
The lens antenna allowed directing radio waves towards the necessary direction, preventing unnecessary radiation. It achieved communication in a millimeter-wave band with high gain (9 dBi) over a wide area, without null points. This innovation prevented communication interruptions during turns and ensured stable communication during convoying.
Potential Application with Beamforming Technology
- Expanding the field of view for external vehicle sensors to enhance collision avoidance systems
- Installing sensors inside vehicles to prevent child abandonment
- Placing sensors in homes to monitor the well-being of elderly individuals
The lens antenna utilized in the experiment was designed using materials developed by NEG specifically for this demonstration. These lens antennas are adaptable to various conditions and functions, promising versatile applications in various aspects of daily life. The company is committed to addressing societal issues that go beyond the realm of communication.
Click here to learn more about Nippon Electric's antenna products.
