Antenna Design

Wideband Monopole Antenna Simulated with Rotational Symmetry Option

Two models of the wideband monopole antenna have been simulated using WIPL-D Pro Software. In particular, S-parameters and radiation pattern at 0.6 GHz of the monopole antenna were calculated and compared. Besides, some details regarding the monopole modelling and the particularities related to Rotational Symmetry setting are presented.

The first calculation being carried out without any simplifications applied, and the second calculation is performed with rotational symmetry applied through Rotational Symmetry option when the n-th part of the antenna structure is modeled. The comparison has confirmed that the simulations carried out using Rotational Symmetry option provide highly accurate results in much shorter time.

The modeling and the simulations were carried out using WIPL-D full wave 3D electromagnetic Method-of-Moments based software which applies Surface Integral Equations. The simulations are very efficient even when simulating on a laptop computer.

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Yagi-Uda Antenna

The Yagi-Uda (further Yagi) antenna is basically a dipole antenna, whose radiation is focused by a series of parallel dipoles and a reflector behind. It is mostly used in radio links for computer (Wi Fi) networks, as well as a receiver for TV and FM radio signals.

Two models of Yagi antennas are simulated in WIPL-D. In the first, the radiating element, ten directors and reflector are modeled as wires, while in the second one they are made of plates (solid body). The application of symmetry is discussed in details.

Simulations are done extremely quickly (in seconds) at regular desktop PC, with low number of unknowns. The application note also shows the advantages of using the wire models. They are order of magnitude easier to develop and simulate. This can lead to the solution of very complex problems, involving thousands of wire elements, without using the more precise and demanding plate models.

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UHF Panel Antenna

Ultra-High Frequency Panel antennas (UHFP antennas) consist of radiating surfaces and reflector. They have been used in TV systems. In the application note, it is covered with radome. Coaxial cable is used for feeding.

In order to speed up simulations and to simplify the modelling process, two symmetry planes can be applied. The antenna is simulated in the frequency band 0.47 GHz up to 0.86 GHz. The powerful built in interpolation algorithm allows simulation in minimum number of points.

WIPL-D successfully analyzes this antenna for only a a fragment of second on any standard desktop or laptop owing to the efficient implementation of the default simulation Method of Moments. WIPL-D uses unique higher order basis functions which allows modelling of large mesh elements (up to 2 wavelengths). Also, the mesh is realized via generalized quadrilaterals so the code requires two times less unknowns than for the standard triangular mesh. No bounding box is required for open region problems.

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