Index: src_plugins/export_openems/export_openems.c
===================================================================
--- src_plugins/export_openems/export_openems.c	(revision 22987)
+++ src_plugins/export_openems/export_openems.c	(revision 22988)
@@ -574,6 +574,7 @@
 	fprintf(ctx->f, "mesh.x = mesh.x .+ offset.x;\n");
 	fprintf(ctx->f, "mesh.y = offset.y .- mesh.y;\n");
 	fprintf(ctx->f, "mesh.z = z_bottom_copper .- mesh.z .+ offset.z;\n");
+	fprintf(ctx->f, "mesh = AddPML(mesh, %d); %% add %d cells around the exterior of the existing mesh of \"perfectly matched\" impedance. 8 is just an example\n", mesh->pml, mesh->pml);
 	fprintf(ctx->f, "CSX = DefineRectGrid(CSX, unit, mesh);\n");
 	fprintf(ctx->f, "\n");
 }
Index: src_plugins/export_openems/mesh.c
===================================================================
--- src_plugins/export_openems/mesh.c	(revision 22987)
+++ src_plugins/export_openems/mesh.c	(revision 22988)
@@ -47,7 +47,7 @@
 typedef struct {
 	PCB_DAD_DECL_NOINIT(dlg)
 	int dens_obj, dens_gap, min_space, smooth, hor, ver, noimpl;
-	int bnd[6], subslines, air_top, air_bot, dens_air, smoothz, max_air, def_subs_thick, def_copper_thick;
+	int bnd[6], pml, subslines, air_top, air_bot, dens_air, smoothz, max_air, def_subs_thick, def_copper_thick;
 	unsigned active:1;
 } mesh_dlg_t;
 static mesh_dlg_t ia;
@@ -959,6 +959,7 @@
 
 	mesh.layer = CURRENT;
 
+	mesh.pml = ia.dlg[ia.pml].default_val.int_value;
 	mesh.dens_obj = ia.dlg[ia.dens_obj].default_val.coord_value;
 	mesh.dens_gap = ia.dlg[ia.dens_gap].default_val.coord_value;
 	mesh.min_space = ia.dlg[ia.min_space].default_val.coord_value;
@@ -1141,6 +1142,13 @@
 							ia.bnd[n+1] = PCB_DAD_CURRENT(ia.dlg);
 					PCB_DAD_END(ia.dlg);
 				}
+
+				PCB_DAD_BEGIN_HBOX(ia.dlg);
+					PCB_DAD_LABEL(ia.dlg, "PML cells:");
+					PCB_DAD_INTEGER(ia.dlg, "");
+						ia.pml = PCB_DAD_CURRENT(ia.dlg);
+						PCB_DAD_MINMAX(ia.dlg, 0, 32);
+				PCB_DAD_END(ia.dlg);
 			PCB_DAD_END(ia.dlg);
 
 			PCB_DAD_BEGIN_VBOX(ia.dlg);
Index: src_plugins/export_openems/mesh.h
===================================================================
--- src_plugins/export_openems/mesh.h	(revision 22987)
+++ src_plugins/export_openems/mesh.h	(revision 22988)
@@ -29,6 +29,7 @@
 	pcb_mesh_lines_t line[PCB_MESH_max];   /* actual lines of the mesh */
 	const char *bnd[6];                    /* temporary: boundary conditions */
 	pcb_coord_t z_bottom_copper;           /* z coordinate of the bottom copper layer, along the z-mesh (0 is the top copper) */
+	int pml;                               /* add pml cells around the exterior of the existing mesh of "perfectly matched" impedance */
 	unsigned smooth:1;                     /* if set, avoid jumps in the meshing by gradually changing meshing distance */
 	unsigned noimpl:1;                     /* when set, do not add extra implicit mesh lines, keep the explicit ones only */
 } pcb_mesh_t;