Articles | Volume 8
Adv. Radio Sci., 8, 243–250, 2010
Adv. Radio Sci., 8, 243–250, 2010

  01 Oct 2010

01 Oct 2010

A time domain spherical near-field measurement facility for UWB antennas employing a hardware gating technique

M. D. Blech1, M. M. Leibfritz2, R. Hellinger3, D. Geier1, F. A. Maier4, A. M. Pietsch1, and T. F. Eibert5 M. D. Blech et al.
  • 1Institut für Hochfrequenztechnik, Universität Stuttgart, Stuttgart, Germany
  • 2Rohde & Schwarz GmbH & Co. KG, Munich, Germany
  • 3Robert Bosch GmbH, Leonberg, Germany
  • 4Hüttinger Elektronik, Freiburg, Germany
  • 5Lehrstuhl für Hochfrequenztechnik, Technische Universität München, Munich, Germany

Abstract. A spherical near-field antenna measurement facility employing a time domain hardware gating technique is presented. On-off keyed sinusoidal impulses are used as stimuli requiring wideband antennas with a bandwidth in excess of 400 MHz. The received signal is evaluated in the time interval after reaching the steady state and before multipath components arising in the non-ideal anechoic chamber distort the signal.

An application specific pulse generator synthesizing sinusoidal impulses with a sub-nanosecond settling time and a low-cost equivalent time (ET) sampling receiver developed and optimized for this particular purpose are described.

Measurement results of typical ultra-wideband (UWB) antennas show a significant improvement of the measured antenna pattern compared to conventional techniques.