1 Introduction

The quasar 3C395 (1901+319; z=0.635) presents at milliarcsecond scales a radio structure which basically consists of two components (hereafter A and B), which are stationary with respect to each other and have a separation of $\sim$16 mas, at a position angle of 118$^{\circ}$. A third weak and extended component (C) appears located between the two in maps made at frequencies lower than 15 GHz (Lara et al. 1994, 1997). A flux density monitoring at 5.0, 8.0 and 14.5 GHz made by the University of Michigan Radio Astronomy Observatory (UMRAO) shows that 3C395 exhibits strong variability which presumably is the result of activity within component A. In fact, high resolution space Very Long Baseline Interferometry (VLBI) observations resolve component A into a core-jet structure with bends. The existence of this complex structure might clarify the apparent contradiction between the lack of observed structural changes from lower resolution VLBI observations and the flux density variability (Lara et al. 1999). The stationary component B has been interpreted as the result of a local bend in the jet towards the observer, while component C seems more related to the emission of a complex underlying jet flow (see Lara et al. 1994, 1997, 1999). Polarimetric observations of 3C395 have recently been reported by Taylor (2000), who presents, in the framework of a study of Faraday Rotation Measure (RM) in the inner jets of a sample of quasars, polarization sensitive VLBA observations at frequencies between 4.6 and 15.2 GHz. Taylor finds a strong gradient in the RM of component A, with the highest value ($\sim$+1200 radm^-2) at the western end of this component. It is now clear that the understanding of the activity and evolution of 3C395 requires the study of the structure of component A at sub-milliarcsecond resolution. Accordingly, we present in this paper polarization-sensitive observations of the quasar 3C395 made with the VLBA at 8.4, 15.4 and 22.2 GHz, with angular resolutions reaching 0.32 mas ($\simeq$1.24 pc) at 22.2 GHz.