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

[摘要] 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 beforemultipath 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 alow-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 conventionaltechniques.

[学科分类] 电子、光学、磁材料