CST – Computer Simulation Technology

Crossed Exponentially Tapered Slot Antenna

Image of the Crossed exponentially tapered slot antenna Image of the Crossed exponentially tapered slot antenna

The crossed exponentially tapered slot antenna may find application in the FCC (and ETSI) defined ultra-wideband (UWB) radio band of 3.1 - 10.6 GHz. The antenna combines two crossed exponentially tapered slots with a star-shaped slot to produce a stable radiation pattern. Measured UWB figures of merit, like the fidelity factor and the pulse stretch ratio, indicate that the structure is able to serve as a Gaussian impulse shaping filter required for UWB radio. Essentially, the antennas used in UWB radio should only minimally distort the shape of the output pulse - both in the frequency, as well as the spatial domain. [Costa et al.]

The measured transfer function, indicating voltage at the receiving antenna vs. applied voltage at the transmitting antenna exhibits a relatively constant magnitude and almost linear phase. Furthermore, the measured group delay is also quite constant and close to zero. ...

The antenna achieves a good (S11 < -8 dB) match over a > 3.42:1 (110%) bandwidth for a 50 Ohm input impedance. This covers the official UWB frequency band of 3.1 - 10.6 GHz. The antenna radiates a bidirectional radiation pattern with the required polarization purity, at an antenna efficiency of between 90 and 97%.

Typical total gain patterns at (a) fmin, (b) fcentre and (c) fmax Typical total gain patterns at (a) fmin, (b) fcentre and (c) fmax Reflection coefficient performance Reflection coefficient performance

Jorge R. Costa, Carla R. Medeiros and Carlos A. Fernandes, "Performance of a Crossed Exponentially Tapered Slot Antenna for UWB Systems," IEEE Transactions on Antennas and Propagation, vol. 57, no. 5, pp. 1345-1352, May 2009.

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