Up 3 dB to the left is the lower cutoff frequency.Ĥ. Compute S parameters for a Transient SimulationĢ.
See the manual if using multiple sources.)ġ. Downloads: 0 This Week Last Update: See Project.
In the Plot - Compute s-parameters menu,Ĥ. FDTD Antenna Simulator is a complete software package for antenna analysis and design using the FDTD method. Will be invalid if any material is within 6 cells of the boundaries.įind how wide the beam is before dropping 3 dB.įDTD-Run Parameters-Voltage Source menu, set the S-parameter computation toĤ. The Plot - Compute Far-Zone Plot Data menu, enter desired angles. Steady State Far Zone Transformation Type for Sinusoidal Source in the FDTD-Run (operating at 1.8GHz) systems with a quarter-wavelength antenna. After calculations are complete, go to Display SAR information in Plotģ. FDTD simulations are carried out for both european GSM (operating at 900MHz) and DECT. In the Plot menu, Compute SAR Statistics for 1 gram SAR values.ħ. Antennas and radiation patterns:- For lossless structures, where all ports are included in the S-Parameters post-processing, the efficiency can be treated as a quantitative measure of convergence of simulation: When efficiency100, the user may assume that the FDTD simulation has converged. The FDTD-Save All Steady-State Quantities-SAR Planes, add at least one of theĦ. Set up for steady state simulation as described above. Note: the results may not be valid for the entire frequency rangeġ. Go to Plot Menu, Plot Input Impedance for both real and imaginary.įrequencies are found where real impedance goes high, and the imaginaryĨ. After simulation is finished, reload FDTD file.Ħ. It must be greater that the number of time steps specified inĥ. The FDTD - Compute Input Impedance menu, set the FFT size. Set up for a transient simulation as described above. This will give plots more data points, giving smoother graphs.Ĭompute input impedance over a frequency range:ġ. Look at the near zone values to determine if To determine if convergence has been reached. Information needed to make changes to your design.Įnough time steps must be included to reach steady state conditions. 200 mm), the cross section of the dipole is 1 mm x 1 mm. One can easily determine the input impedanceĪllows you to find the resonant frequency of an antenna, and gives you the 5.2 DIPOLE ANTENNA The length of a half-wavelength dipole is 100 mm (frequency 1500 MHz and A.
Gaussian pulse or one of its variations as a source. Abstract:Automobile antenna simulation with FDTD EM simulation technology.Automobile antenna simulations are commonly performed using FDTD simulation technology.
Many of these values can be found by simply looking at the Steady Stateįor determining the general parameters of an antenna over a range of Parameters of an object at the specified input frequency. Sinusoid source found in the FDTD – Run Parameters - Voltage Source menu. Simulation run is complete, the fdtd file needs to be reloaded into xfdtd for
The data will be stored in the directory that After the fdtd file is created and saved, calcfdtd can be run. The fdtd file automatically references the geometryįile that was open when it is created. Geometry file has been saved, an fdtd file needs to be created. Simulation parameters, including the location of sources, number of time steps,Īnd data to be saved during the simulation. PlotFFdB (nf2ff, 'xaxis', 'theta', 'param', ) % conventional plot approach % plot( nf2ff.theta*180/pi, 20*log10(nf2ff.E_norm (: ) ) * nf2ff.Information about grid spacing and size, material types, and the location of PolarFF (nf2ff, 'xaxis', 'theta', 'param',, 'normalize', 1 ) % log-scale directivity plot figure % normalized directivity as polar plot figure % display power and directivity disp ( ) ĭisp ( ) % calculate the far field at phi=0 degrees and at phi=90 degrees disp ( 'calculating far field at phi= deg.' )