  Sinuous antennas exhibit many desirable properties for ground penetrating
radar (GPR) applications such as ultra-wide bandwidth, polarization diversity,
and a low-profile form factor. However, sinuous antennas are dispersive since
the active region moves with frequency along the structure. This is an
undesirable quality for pulsed-radar applications since the radiated pulse will
be distorted. Such distortion may be detrimental to close-in sensing
applications such as GPR. This distortion may be compensated in processing with
accurately simulated or measured phase data. However, antenna performance may
deviate from that simulated or measured due to the dielectric loading of the
ground. In such cases, it may be desirable to employ a dispersion model based
on antenna design parameters which may be optimized in-situ. Dispersion
compensation models previously investigated for other antennas may be similarly
applied to sinuous antennas. This paper explores the dispersive properties of
the sinuous antenna and presents a simple model that may be used to compress
dispersed pulses.
