CST – Computer Simulation Technology

Planar Elliptical Dipole for UWB

Image of the Planar elliptical dipole for UWB Image of the Planar elliptical dipole for UWB

The standard elliptical dipole antenna may find application for use in the FCC (and ETSI) defined ultra-wideband (UWB) radio band of 3.1 - 10.6 GHz. However, while the basic structure is able to cover the required frequency range, it may not be the most optimal structure to serve as a Gaussian impulse shaping filter required for UWB radio. To address this shortcoming, elliptical slots are used on the dipole arms, resulting in low-level ringing and pulse distortion.

This planar antenna consists of a basic outer elliptical dipole element with inner elliptical slots (cutouts), which may be practically fed in a number of ways. Generally, the planar element is fabricated by etching a metallized dielectric substrate.

The antenna achieves a good (S11 < -10 dB) match over most of the 10:1 bandwidth for a 50 Ohm input impedance, while at one portion in the band it is slightly worse, at around -7.5 dB, depending on substrate....

Typical reflection coefficient Typical reflection coefficient Radiation patterns at (a) 1, (b) 2, (c) 4, (d) 6, (e) 8 and (f) 10 times the minimum operating frequency Radiation patterns at (a) 1, (b) 2, (c) 4, (d) 6, (e) 8 and (f) 10 times the minimum operating frequency

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