Resonant behavior of the barrier of YBa2Cu3O7 grain boundary Josephson junctions fabricated on bicrystalline substrates with different geometries

► A resonant behavior in the dielectric constant of the barrier of YBa2Cu3O7 GBJJs is analyzed. ► A value for the length L of the normal N region assuming a SNINS model for the barrier is estimated. ► The L dependence on the critical current density Jc has been investigated. ► A single representation for all the geometries independently on rotation axes is plotted. ► The resonance frequency position is affected by the oxygen content of the barrier.