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Leakage of polarized Galactic diffuse emission into total intensity canpotentially mimic the 21-cm signal coming from the epoch of reionization (EoR),as both of them might have fluctuating spectral structure. Although we aresensitive to the EoR signal only in small fields of view, chromatic sidelobesfrom further away can contaminate the inner region. Here, we explore theeffects of leakage into the 'EoR window' of the cylindrically averaged powerspectra (PS) within wide fields of view using both observation and simulationof the 3C196 and NCP fields, two observing fields of the LOFAR-EoR project. Wepresent the polarization PS of two one-night observations of the two fields andfind that the NCP field has higher fluctuations along frequency, andconsequently exhibits more power at high-$k_\parallel$ that could potentiallyleak to Stokes $I$. Subsequently, we simulate LOFAR observations of Galacticdiffuse polarized emission based on a model to assess what fraction ofpolarized power leaks into Stokes $I$ because of the primary beam. We find thatthe rms fractional leakage over the instrumental $k$-space is $0.35\%$ in the3C196 field and $0.27\%$ in the NCP field, and it does not change significantlywithin the diameters of $15^\circ$, $9^\circ$ and $4^\circ$. Based on theobserved PS and simulated fractional leakage, we show that a similar level ofleakage into Stokes $I$ is expected in the 3C196 and NCP fields, and theleakage can be considered to be a bias in the PS.

Polarization leakage in epoch of reionization windows: III. Wide-field effects of narrow-field arrays