Phased antenna arrays are important in many applications including radar and communications.
This thesis seeks to understand the accumulation of error from different components in a RowCard configuration of a Butler Matrix and its impact on a multi-modal circular phased array for a
band of 2-18 GHz. We present a method to generate a Row-Card Butler Matrix and simulate its
phase output, for the ideal case and the case with error. We create and apply a notional model of
RMS phase error as a function of frequency, using data for commercially available digital phase
shifters and an ultrawideband digital phase shifter found in the literature. We use the error model
to introduce phase error at the theoretical Butler Matrix inputs as represented in the equation for
the radiation pattern of a matrix-fed circular antenna array. The results with and without error are
very similar, suggesting that further investigation is required.
