Ultra wideband (UWB) technology plays a significant role in wireless communication. The
complex antenna transfer function (CATF) of an UWB antenna provides important
information required for better channel designs and communication systems. In this
dissertation the CATF of a Double ridge guide horn (DRGH) antenna is determined and
used as a standard antenna for UWB measurements. Two methods were used: the two
antenna method in an anechoic chamber and a modified gain-transfer method in a compact
antenna test range (CATR). Measurements were performed with a vector network analyser
(VNA) in the frequency domain, in the anechoic chamber and the CATR. The distance
measurements required to calculate the CATF from the S-parameter measurements were
performed in the time domain. The CATF of the standard antenna was determined using
two identical antennas and then it was shown that a modified gain-transfer method can be
used to determine the CATF of any unknown antenna in a CATR, using the standard
antenna as a reference. Some of the challenges were to obtain the correct equations and
measurement method to obtain the CATF in a CATR. The standard antenna was used to
investigate uncertainty contributions for the measurements in the CATR.
Dissertation (MEng)--University of Pretoria, 2013.
Jacobs, Ockert Botha; Odendaal, J.W. (Johann Wilhelm); Joubert, Johan(Institute of Electrical and Electronics Engineers, 2013)
We present a quad-ridge horn antenna as a feed for
a reflector antenna for use in radio astronomy applications. The
antenna uses elliptically shaped sidewalls to limit the variation of
beamwidth over a wide frequency ...
Hildebrand, Louis Trichardt(University of Pretoria, 2010-01-27)
The design of antenna arrays involves, amongst others, the selection of the array elements and geometry, as well as the element excitations. The feeding network to obtain the desired excitations can become quite complex, ...
Mayhew-Ridgers, Gordon(University of Pretoria, 2005-09-21)
The principal contributions of this study include the development of a new capacitive feeding mechanism for wideband probe-fed microstrip patch antennas as well as the implementation of a spectral-domain moment-method ...