Vehicular Bidirectional Internal Antenna with Asymmetric Gain Characteristics to Compensate for Backward Link Path Loss due to Interior Obstacles

Dong-Woo Kim,Soon-Soo Oh,Wook-Ki Park,María Elena De Cos Gómez

doi:10.1155/2021/5370526

Abstract

Wireless communication technologies are expected to become essential in future self-driving vehicles. This study presents an antenna for vehicle wireless communication with a bandwidth of 75 MHz at a Wireless Access in Vehicular Environment frequency of 5.885 GHz. To compensate for the backward link path loss from the vehicle interior and passengers, the antenna is designed to have asymmetric gains of 0 and 6 dBi at 0° and 180°, respectively. The antenna is validated through an outdoor road test. We measured the received continuous-wave (CW) power, received signal strength indicator, and packet-delivered ratio (PDR) of the digital signal under vehicle-to-vehicle communication mode. Similar power is received in both the backward and forward scenarios. The forward and backward PDR are also similar.

Highlights

With the rapid development of communication technologies, a wide range of innovative services are available to consumers
The gain at 90° is about −10 dBi instead of 0 dBi, as shown in Figure 5. erefore, the received signal strength indicator (RSSI) might be −85 dBm, which is greater than the required standard of −95 dBm (Figure 11), and V2V communication should be possible at an intersection using a low direction antenna
The antenna is composed of two pairs of patch antennas. e patch antennas were resonant at 5.885 GHz and exhibited a bidirectional pattern with asymmetric gain that allowed efficient V2V communication

Summary

Introduction

With the rapid development of communication technologies, a wide range of innovative services are available to consumers. Erefore, if the excess power of the front side is transferred to the rear side, the forward and backward links can be balanced; this is the main objective of this study Another advantage of the antenna with asymmetric gain is the possibility of changing the position of the antenna inside the vehicle.

Bottom layer

Exterior Exterior Exterior Interior

Backward link Forward link

Conclusion