CST – Computer Simulation Technology

Planar Elliptical Dipole

Image of the Planar elliptical dipole Image of the Planar elliptical dipole

The elliptical dipole antenna may find application for use in the FCC (or ETSI) defined ultra-wideband (UWB) radio band of 3.1 - 10.6 GHz. While it may not be the optimal structure to serve as a Gaussian impulse shaping filter required for UWB radio, it is a relatively simple, widely used antenna which finds application in a number of devices.

The elliptical dipole consists of 2 elliptical discs excited at their closest point. Achieving a practically realizable implementation of this excitation without impacting on the radiation pattern requires some care. Since the antenna pattern displays nulls in the axial direction, a microstrip-to-balanced stripline (also known as parallel strips line) feed is used, as shown below.

Practical implementation with microstrip-to-balanced stripline feed Practical implementation with microstrip-to-balanced stripline feed...

The antenna achieves a good match (S11 < -10 dB) over a > 6:1 bandwidth for a 100 Ohm input impedance. In this band, the radiation pattern changes from an omnidirectional pattern at low frequencies, to a more erratic multipath shape at higher frequencies.

While various ratios of ellipse width-to-length are possible, a 1:1 ratio is also common.

Typical reflection coefficient of an elliptical dipole Typical reflection coefficient of an elliptical dipole Radiation pattern of the elliptical dipole at various frequencies in the operating band Radiation pattern of the elliptical dipole at various frequencies in the operating band

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