Abstract: A new planar sparse geometry, referred to as the sparse H array was proposed by re-optimizing the sensors of open box array (OBA) based on difference co-array concept. The new structures has the same number of identifiable sources as the OBAs. It can decrease the mutual coupling effect between sensors by effectively reducing sensor pairs with closed space. Simulations of the direction-of-arrival estimation verify the better anti-coupling capability of the proposed PSAs than other geometries with the 2-D unitary ESPRIT algorithm used.