Abstract
This paper presents the design and analysis of a planar ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna for modern vehicular communication systems. The proposed unit cell antenna structure was designed using modified elliptical radiators on a Rogers RO3003 substrate, has a size of 22 × 22 × 0.76 mm3, and covers an impedance bandwidth (S11 ≤ −10 dB) of 3.14 GHz to 12.24 GHz. The peak gain and efficiency of the unit cell prototype are 5.1 dBi and 81%, respectively. The unit cell was further developed into a MIMO antenna configuration with four elements placed orthogonal to each other in a single plane measuring 50 × 50 × 0.76 mm3. The measured isolation between the antenna elements was greater than 20 dB. The measured envelope correlation coefficient (ECC) of the MIMO antenna was less than 0.004, the diversity gain (DG) was greater than 9.67 dB, the total active reflection coefficient (TARC) was <−10 dB, and the mean effective gain (MEG) ratio was > 0.99. The characteristics of the proposed unit cell and the MIMO antenna were investigated for housing effects in order to validate the consistent performance of the antenna in the presence of conducting bodies. In addition, the radiation characteristics of the antenna when mounted on a vehicle were analyzed using a virtual model of the car. The results show that the proposed quad-element UWB MIMO array is compact, has good performance, and is well-suited for automotive applications.
Highlights
In light of recent advancements in the automobile communication industries, it seems that ultra-wideband (UWB) and multiple-input-multiple-output (MIMO) technologies are beneficial for vehicular communication with high data rates
MIMO/diversity technology with a high data rate can be used for modern automotive communication to improve the link reliability of the communication system [3]
In [38,39,40], car model analyses using far-field characteristics were presented to investigate the effect of the vehicular body on the radiation patterns of the antenna when it is placed in different locations
Summary
In light of recent advancements in the automobile communication industries, it seems that ultra-wideband (UWB) and multiple-input-multiple-output (MIMO) technologies are beneficial for vehicular communication with high data rates. Wireless communication applications, such as the global system for mobile communication (GSM), WLAN. In [37], a spiral antenna with a taper feed was presented, where the housing effect was investigated using the unit element for vehicular communication. In [38,39,40], car model analyses using far-field characteristics were presented to investigate the effect of the vehicular body on the radiation patterns of the antenna when it is placed in different locations.
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