Theoretical studies and numerical simulation of wakefield excitation in planar dielectric resonator by regularudsequence of relativistic electron bunches are carried out. It is shown, that in resonator case at conservation of fieldudpeaking, i.e. maintenance of multimode condition, the number of bunches, participating in wakefield summing, isudincreased. As a result the amplitude of the field, used for charged particle acceleration, essentially increases inudcomparison with a section of the dielectric waveguide of the same length. Thus, legitimacy of the resonator conceptudfor wakefield method of charged particle acceleration is proved. Numerical calculations are carried out for plannedudexperiment on accelerator "Almaz-2" on wakefield excitation in the rectangular dielectric resonator by a sequence ofudbunches with charge 0.32 nC and energy 4 MeV each.
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