  We study the response of several microwave resonators made from
superconducting NbTiN thin-film meandering nanowires with large kinetic
inductance, having different circuit topology and coupling to the transmission
line. Reflection measurements reveal the parameters of the circuit and analysis
of their temperature dependence in the range 1.7-6 K extract the
superconducting energy gap and critical temperature. The lumped-element LC
resonator, valid in our frequency range of interest, allows us to predict the
quasiparticle contribution to internal loss, independent of circuit topology
and characteristic impedance. Our analysis shows that the internal quality
factor is limited not by thermal-equilibrium quasiparticles, but an additional
temperature-dependent source of internal microwave loss.
