Abstract
A low-profile antenna over a ground plane that radiates a directive lobe in the end fire direction is described in this paper. An array of 16 wire patch antenna (WPA) fed by an integrated 16 ways power divider has been designed. Owing to its low height, low cost, high robustness, and monopolar radiation pattern, the WPA has been chosen as unit cell of the array that must be placed on the vehicle roof. A gain higher than 18.9 dB was achieved in the end fire direction over a 4.5% bandwidth. However, the antenna has been tilted in order to compensate the beam deviation caused by the edge diffraction. Moreover, a vertical metallic plane has been inserted to eliminate the back fire radiation. Its position and the disposition of the WPAs are explained in this paper. A prototype with four elements has been manufactured in order to validate the antenna principle. A gain difference lower than 0.5 dB is achieved between the measurements and the simulations.
Highlights
The context concerns a communication system between a vehicular and some base stations that are located on the trajectory
The Yagi antenna [1,2,3] or the log periodic dipole array antennas [4, 5] that radiate in the array plane agree with the profile constraint
Owing to its low height, low cost, high robustness, and monopolar radiation pattern, this kind of antenna is very suitable for practical wireless communications applications
Summary
The context concerns a communication system between a vehicular and some base stations that are located on the trajectory. This paper deals with the design of the vehicular antenna that is must satisfy some particular requirements At first, this antenna has to be integrated on the roof that induces a low-profile antenna working over a ground plane. In order to reduce the height, these last can be folded [12] Another low-profile antenna which has an omnidirectionnal radiation pattern in the azimuthal plane is the “wire patch antenna” (WPA) [13,14,15]. In this paper we will describe a high-gain array of WPA which provides a directive lobe in one direction in the azimuthal plane. An array of 16 WPAs fed by an integrated microstrip power divider will be described
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