Log-Periodic Antenna

Application ID: 36111

The shape of a log-periodic antenna resembles that of a Yagi-Uda antenna, but is composed of a coplanar array to achieve a wider bandwidth. It is also known as a wideband or frequency-independent antenna.

All metallic parts are modeled using the perfect electric conductor (PEC) boundary conditions. The antenna is excited by a lumped port while a lumped element with a resistor is used to terminate the excitation.

Results show the impedance matching properties on a Smith plot as well as a far-field polar plot, which shows that the directionality of the radiation pattern varies slightly as frequency increases. A 3D far-field radiation pattern shows the same tendency. Also presented is the voltage-standing-wave-ratio (VSWR) of the antenna.

This model example illustrates applications of this type that would nominally be built using the following products: