  The second phase of the T2K experiment is expected to start data taking in
autumn 2022. An upgrade of the Near Detector (ND280) is under development and
includes the construction of two new Time Projection Chambers called High-Angle
TPC (HA-TPC). The two endplates of these TPCs will be paved with eight
Micromegas type charge readout modules. The Micromegas detector charge
amplification structure uses a resistive anode to spread the charges over
several pads to improve the space point resolution. This innovative technique
is combined with the bulk-Micromegas technology to compose the "Encapsulated
Resistive Anode Micromegas" detector. A prototype has been designed, built and
exposed to an electron beam at the DESY II test beam facility.
  The data have been used to characterize the charge spreading and to produce a
RC map. Spatial resolution better than 600 $\mu$m and energy resolution better
than 9% are obtained for all incident angles. These performances fulfil the
requirements for the upgrade of the ND280 TPC.

Instrumentation and Detectors;High Energy Physics - Experiment