  We present an original design for large area gaseous detectors based on the
MICROMEGAS technology. This technology incorporates an insulating grid,
sandwiched between the micro-mesh and the anode-pad plane, which provides an
uniform 200 $\mu$m amplification gap. The uniformity of the amplification gap
thickness has been verified under several experimental conditions. The gain
performances of the detector are presented and compared to the values obtained
with detectors using cylindrical micro spacers. The new design presents several
technical and financial advantages.
