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In-plane microwave penetration depth $\lambda_{ab}$ and quaiparticleconductivity at 28 GHz are measured in underdoped single crystals of theFe-based superconductor PrFeAsO$_{1-y}$ ($T_c\approx 35$ K) by using asensitive superconducting cavity resonator. $\lambda_{ab}(T)$ shows flatdependence at low temperatures, which is incompatible with the presence ofnodes in the superconducting gap $\Delta({\bf k})$. The temperature dependenceof the superfluid density demonstrates that the gap is non-zero($\Delta/k_BT_c\gtrsim 1.6$) all over the Fermi surface. The microwaveconductivity below $T_c$ exhibits an enhancement larger than the coherencepeak, reminiscent of high-$T_c$ cuprate superconductors.

Microwave Penetration Depth and Quasiparticle Conductivity in PrFeAsO_1-y Single Crystals : Evidence for a Full-Gap Superconductor