  The hypothesis that tidal forces on the Sun are related to the modulations of
the solar-activity cycle has gained increasing attention. The works proposing
physical mechanisms of planetary action via tidal forcing have in common that
quasi-alignments between Venus, Earth, and Jupiter (V-E-J configurations) would
provide a basic periodicity of $\approx 11.0$ years able to synchronize the
operation of solar dynamo with these planetary configurations. Nevertheless,
the evidence behind this particular tidal forcing is still controversial. In
this context we develop, for the first time, the complete Sun's tide-generating
potential (STGP) in terms of a harmonic series, where the effects of different
planets on the STGP are clearly separated and identified. We use a modification
of the spectral analysis method devised by Kudryavtsev (J. Geodesy. 77, 829,
2004; Astron. Astrophys. 471, 1069, 2007b) that permits to expand any function
of planetary coordinates to a harmonic series over long time intervals. We
build a catalog of 713 harmonic terms able to represent the STGP with a high
degree of precision. We look for tidal forcings related to V-E-J configurations
and specifically the existence of periodicities around $11.0$ years.
  Although the obtained tidal periods range from $\approx$ 1000 years to 1
week, we do not find any $\approx$ 11.0 years period. The V-E-J configurations
do not produce any significant tidal term at this or other periods. The Venus
tidal interaction is absent in the 11-year spectral band, which is dominated by
Jupiter's orbital motion. The planet that contributes the most to the STGP in
three planets configurations, along with Venus and Earth, is Saturn. An
$\approx 11.0$ years tidal period with a direct physical relevance on the
11-year-like solar-activity cycle is highly improbable.
