  Integrated sensing and communications (ISAC) has emerged as a means to
efficiently utilize spectrum and thereby save cost and power. At the higher end
of the spectrum, ISAC systems operate at wideband using large antenna arrays to
meet the stringent demands for high-resolution sensing and enhanced
communications capacity. However, the wideband implementation entails
beam-squint, that is, deviations in the generated beam directions because of
the narrowband assumption in the analog components. This causes significant
degradation in the communications capacity, target detection, and parameter
estimation. This article presents the design challenges caused by beam-squint
and its mitigation in ISAC systems. In this context, we also discuss several
ISAC design perspectives including far-/near-field beamforming,
channel/direction estimation, sparse array design, and index modulation. There
are also several research opportunities in waveform design, beam training, and
array processing to adequately address beam-squint in ISAC.
