  This paper presents a novel technique to build squint-free massive phased
arrays. This is accomplished by explicitly implementing a spatial IDFT to
cancel out the DFT imposed by the array nature which causes beam squint. In
addition, the paper analyzes the beam-squint issue, which arises from two
mechanisms: the coherent bandwidth limitations and the systematic delay spread
in the array. These mechanisms reduce the signal-to-noise ratio and cause
inter-symbol interference. This work also highlights the importance of
utilizing OFDM modulation to enhance signal quality by mitigating the
self-interference issue. A numerical solver is used to simulate and verify the
IDFT squint-free implementation and to estimate the signal quality limitations
in massive arrays.
