  A $Q$-enhancement strategy for racetrack microresonators is put forward. The
design is based on the modification of the resonator geometry in order to
mitigate the two main sources of radiation loss in the presence of curved
waveguides: the discontinuities at the junctions between straight waveguides
and the bent sections, and the continuous loss at the curved waveguide sectors.
At the same time, the modifications of the geometry do not affect the
versatility of coupling of racetrack resonators in integrated optical circuits,
which is their main advantage over ring microresonators. The proposal is
applied to the design of high-$Q$ racetrack resonators for the silicon nitride
CMOS-compatible platform having bent radii amenable for large-scale photonic
integration. Numerical calculations show over $100\%$ improvement of the $Q$
factor in $\text{Si}_3\text{N}_4/\text{SiO}_2$ resonators.
