  We investigate the radio emitting structures of radio-quiet active galactic
nuclei with an emphasis on radio-quiet quasars to study their connection to
Seyfert galaxies. We present and analyse high-sensitivity VLA radio continuum
images of 14 radio-quiet quasars and six Seyfert galaxies. Many of the low
redshift radio-quiet quasars show radio structures that can be interpreted as
jet-like outflows. However, the detection rate of extended radio structures on
arcsecond scales among our sample decreases with increasing redshift and
luminosity, most likely due to a lack of resolution. The morphologies of the
detected radio emission indicate strong interactions of the jets with the
surrounding medium. We also compare the radio data of seven quasars with
corresponding HST images of the [OIII] emitting narrow-line region (NLR). We
find that the scenario of interaction between the radio jet and the NLR gas is
confirmed in two sources by structures in the NLR gas distribution as
previously known for Seyfert galaxies. The extended radio structures of
radio-quiet quasars at sub-arcsecond resolution are by no means different from
that of Seyferts. Among the luminosities studied here, the morphological
features found are similar in both types of objects while the overall size of
the radio structures increases with luminosity. This supports the picture where
radio-quiet quasars are the scaled-up versions of Seyfert galaxies. In addition
to known luminosity relations we find a correlation of the NLR size and the
radio size shared by quasars and Seyferts.
