Log Periodic Dipole Array (LPDA)

The field patterns, input impedance for each dipole, overall input impedance and VSWR are computed.
The array is fed at the high frequency end and loaded at the low frequency end.
The LPDA specified by the tau and sigma provided is displayed to enzure a realistic design was specified.
The LPDA is oriented such that the smallest element is at the top and largest element is at the bottom with repspect to the E and H field pattern plots.

The following figure illustrates the geometry of the array. Tau and sigma are the standard defining parameters for log periodic antennas and are defined by the equations givn in the figure. Note that the LPDA feed includes a 180 degree phase shift by the nature of its standard feed.

Specify the following:

Input Block:

Adjacent images can be compiled into a movie and 3D graphics can be converted to a VRML format:
Note: VRML images require a VRML viewer and Movies require a MPEG viewer.

Select a display mode

Enter values in this section only if you are submitting a job for later retrieval:

Title for job:
Brief description of the job:

This script was developed at the Center for Computational Electromagnetics (CCEM) in the University of Illinois at Urbana with funding from the Sloan Center for Asynchronous Learning Environments(SCALE).

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