Antenna Simulation in An Automobile - Jeep
Abstract:Automobile antenna simulation with FDTD EM simulation technology.Automobile antenna simulations are commonly performed using FDTD simulation technology. The reason is that FDTD can easily handle larger problem sizes and with simpler meshing technology, compared to frequency domain EM solvers that are based on geometry or vertex based meshing technology. In this example, automobile antennas are simulated with EMPro FDTD EM simulation technology.
Figure 1 shows the antennas mounted on a Jeep vehicle.
Figure 1: Jeep Antenna
Antenna performance is affected by its surroundings, including an automobile body which acts as a ground plane. This is a big challenge for antenna designers, and the problem size may be too large for popular frequency domain solvers such as FEM, unless the geometry is greatly simplified. The reason is because most frequency domain solvers mesh the structure based on the number of vertices in the given geometry (this is known as Geometry Based meshing). The more complex the geometry is, the larger the mesh is, which produces more unknowns to solve. However, FDTD meshing is based on uniform grids (Grid Based meshing), so the meshing is much simpler and produces smaller problems than FEM, making FDTD simulation technology attractive to antenna designers.
Figure 2 shows the radiation pattern of the vehicle antennas.
Figure 2: Gain Pattern
In this example, it is demonstrated how complex and large designs such as antennas on an automobile can be effectively simulated with state of the art FDTD EM simulation technology.