Title :
Modified H-Shaped Antenna for Automotive Digital Terrestrial Reception
Author :
Iizuka, Hideo ; Watanabe, Toshiaki ; Sato, Kazuo ; Nishikawa, Kunitoshi
Author_Institution :
Toyota Central R&D Labs. Inc., Aichi, Japan
Abstract :
A modified H-shaped antenna is proposed for automotive digital terrestrial reception. The antenna is analyzed by the method of moments. The antenna has the feature that a figure-8 radiation pattern is rotated with increasing frequency. Four symmetrically mounted antennas at the top of the front and rear windows of a car have gain to the sides of the car as well as to the front and rear directions. The VSWR is less than 3 from 470 to 710 MHz since the antenna has three resonant modes. Measurement results for a single prototype antenna agree with the calculation results. The reception system adopts an adaptive array based on the maximal ratio combining (MRC) method. A near omnidirectional pattern was obtained in a plotted pattern of steered beam in the horizontal plane with the mounted prototype antennas.
Keywords :
UHF antennas; adaptive antenna arrays; antenna radiation patterns; digital television; high definition television; method of moments; radio reception; road vehicles; 470 to 710 MHz; MRC method; UHF antenna; adaptive array; automotive digital terrestrial reception; digital television; maximal ratio combining; method of moment; modified H-shaped antenna; near omnidirectional radiation pattern; resonant mode; road vehicle; single prototype antenna; steered beam pattern; symmetrically mounted antenna; Adaptive arrays; Adaptive systems; Antenna measurements; Antenna radiation patterns; Automotive engineering; Directive antennas; Frequency; Moment methods; Prototypes; Resonance; Digital television; UHF antennas; moment methods; road vehicles;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2005.852288
