Changes
/* Simulating the Patch Antenna on the Vehicle's Hood */
{{projectinfo|Application|Simulating The Performance Of Installed Antennas On Vehicular Platforms Using EM.Tempo|ART_GOLF_Fig_title.png|In this project, large parabolic reflectors fed by pyramidal horn antennas mounted on a complex, real-sized, automobile platform are modeled and analyzed using EM.Illumina and EM.Tempo.|*[[Building Geometrical Constructions in CubeCAD | CubeCAD]]
*[[EM.Tempo]]
*[[EM.Illumina]]CAD Model*Pyramidal HornPatch Wizard*Parabola*Object of RevolutionYee Mesh
*Field Distribution
*Radiation Pattern
*High Performance Computing
|All versions|None }}
|-
! scope="col"| Material
! scope="col"| ε<sub>r</sub>
! scope="col"| σ
! scope="col"| Designated Model Parts
|-
| PEC
| 1
| ∞
| Car body
|-
| Glass
| 6.5
| 0.005S/m
| Car windows
|-
| Plastic
| 2.2
| 0.0
| Head-light covers, brake-light covers, license plate mounts
|-
| Rubber
| 2.9
| 0.005S/m
| Tires
|-
| Aluminum
| 1
| 3.8×10<sup>6</sup>) S/m| Wheel rims
|-
| Cement
| 1.9
| 0.0
| Road surface
|}
The FDTD simulation of the vehicle structure was run on [https://aws.amazon.com/ Amazon Web Services]. For the purpose of this project, we logged into an Amazon instance via Remote Desktop Protocol (RDP) and used a c4.4xlarge instance running Windows Server 2012. This instance had 30 GB of RAM memory, and 16 virtual CPU cores. The CPU for this instance was an Intel Xeon E5-2666 v3 (Haswell) processor. The thread factor setting essentially tells the FDTD engine how many CPU threads to use during [[EM.Tempo]]'s time-marching loop. For a given system, some experimentation may be needed to determine the best number of threads to use. Eight thread factors were used for this simulation, with a total computation time of 285 minutes.
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The figure below shows the 3D far-field radiation pattern of the installed patch antenna on the vehicle 's roof. For this simulation, the far-field angular resolution was set to 2.5° along both azimuth and elevation directions.
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[[Image:Roof pattern.png|thumb|left|640px| 3D far-field radiation pattern of the vehicle-antenna combination structure, with the patch antenna installed on the vehicle 's roof.]]
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[[Image:Roof yz cut.png|thumb|left|480px| 2D linear-scale polar radiation pattern of the roof-mounted patch antennain the YZ plane..]]
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[[Image:Roof zx cut.png|thumb|left|480px| 2D linear-scale polar radiation pattern of the roof-mounted patch antennain the ZX plane..]]
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== Simulating the Patch Antenna on the Vehicle's Hood ==
Next, we move the patch antenna onto the front hood of the Golf model close to the front windshield as shown in the figure below.
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[[Image:Hood mount.png|thumb|left|420px480px| The location of the patch antenna on the vehicle's hood.]]
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[[Image:Hood mount mesh detail.png|thumb|left|640px480px| The details of the Yee mesh of the vehicle structure generated by EM.Tempoaround the location of the patch antenna on the hood.]]
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The FDTD simulation of the vehicle structure with its new antenna location is performed on the same computing platform using Amazon Web Services (AWS). The total computation time in this case increased to 325 minutes.
The figure below shows the electric field distribution of the vehicle-antenna combination structure in the vertical ZX plane that passes through the center of the vehicle.
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The figure below shows the 3D far-field radiation pattern of the installed patch antenna on the vehicle roof's hood. For this simulation, the far-field angular resolution was set to 2.5° along both azimuth and elevation directions.
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[[Image:Hood pattern.png|thumb|left|640px| 3D far-field radiation pattern of the vehicle-antenna combination structure, with the patch antenna installed on the vehicle roof's hood.]]
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The figures below show the 2D polar radiation patterns of the roofhood-mounted patch antenna in the principal YZ and ZX planes. Comparing these graphs with those of the isolated patch antenna in the two previous section reveals cases shows significant reflection and diffraction effects at the impact new location of the mounting platform on the radiation characteristics of the installed patch antenna.
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[[Image:Hood yz cut.png|thumb|left|480px| 2D linear-scale polar radiation pattern of the roofhood-mounted patch antennain the YZ plane.]]
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[[Image:Hood zx cut.png|thumb|left|480px| 2D linear-scale polar radiation pattern of the roofhood-mounted patch antennain the ZX plane.]]
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