CST – Computer Simulation Technology

Modelling vehicular diversity antenna using loads on parasitic elements

Modelling vehicular diversity antenna using loads on parasitic elements
L. Low, R. J. Langley
IWAT 2005. IEEE International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials
March 2005
501 - 504
Wireless communication devices are becoming increasing popular in today’s automobiles. There have been increasing demands by consumers to include communications systems ranging from AM/FM radio, cellular mobile, multimedia applications to navigation equipment in the automobile. Different antennas are needed for these wireless systems. To avoid the use of multiple rod antennas on the roof of the automobile and to preserve the aesthetic body design, hidden antennas are often used in the glass and plastic areas [1-2]. More recently, to hide the antennas from view; an aperture in the roof has been used to house a variety of printed communication antennas. The sizes of these apertures are usually no bigger than a sunroof and it is a challenge to design several antennas for different applications in close proximity of each other. Moreover, hidden antennas usually suffer from performance degradation due to radiation blockage and multi-path interference. It is known that maximum selection, tracking and null matching antennas are able to reduce fading. Hence, diversity system consisting of four or more antennas [3-4], each requiring an amplifier placed in different locations of the automobile are commonly used to improve performance. This option can increase manufacturing cost significantly and is not suitable if antenna placement is limited to small apertures.

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