diff --git a/qucs-filter/filter.cpp b/qucs-filter/filter.cpp
index e2307618..f8881a44 100644
--- a/qucs-filter/filter.cpp
+++ b/qucs-filter/filter.cpp
@@ -415,6 +415,30 @@ QString Filter::getMS_Via(double height, int x, int y, int rotate)
     return code;
 }
 
+QString Filter::getMS_Open(double width, int x, int y, int rotate)
+{
+    QString code;
+    switch (rotate)
+    {
+        case 0: // No rotation
+            code = QString("<MOPEN MS93 1 %1 %2 -20 -50 0 0 \"Sub1\" 0 \"%3 mm\" 1 \"Hammerstad\" 0 \"Kirschning\" 0 \"Kirschning\" 0>\n").arg(x).arg(y).arg(QString::number(width*1e3, 'f', 2));
+            break;
+
+        case 1: // CTRL+R
+            code = QString("<MOPEN MS93 1 %1 %2 15 -12 0 1 \"Sub1\" 0 \"%3 mm\" 1 \"Hammerstad\" 0 \"Kirschning\" 0 \"Kirschning\" 0>\n").arg(x).arg(y).arg(QString::number(width*1e3, 'f', 2));
+            break;
+
+        case 2: // 2 x (CTRL+R)
+            code = QString("<MOPEN MS93 1 %1 %2 -20 -50 0 2 \"Sub1\" 0 \"%3 mm\" 1 \"Hammerstad\" 0 \"Kirschning\" 0 \"Kirschning\" 0>\n").arg(x).arg(y).arg(QString::number(width*1e3, 'f', 2));
+            break;
+
+        case 3: // 3 x (CTRL+R)
+            code = QString("<MOPEN MS93 1 %1 %2 15 -20 0 3 \"Sub1\" 0 \"%3 mm\" 1 \"Hammerstad\" 0 \"Kirschning\" 0 \"Kirschning\" 0>\n").arg(x).arg(y).arg(QString::number(width*1e3, 'f', 2));
+            break;
+    }
+    return code;
+}
+
 QString Filter::getWireString(int x1, int y1, int x2, int y2)
 {
   return QString("<%1 %2 %3 %4 \"\" 0 0 0>\n").arg(x1).arg(y1).arg(x2).arg(y2);
diff --git a/qucs-filter/filter.h b/qucs-filter/filter.h
index a861f469..9c6fddbf 100644
--- a/qucs-filter/filter.h
+++ b/qucs-filter/filter.h
@@ -70,6 +70,8 @@ public:
   static QString getTeeString(int x, int y, double width1, double width2, double width3);
   static QString getWireString(int x1, int x2, int x3, int x4);
   static QString getMS_Via(double height, int x, int y, int rotate);
+  static QString getMS_Open(double width, int x, int y, int rotate);
+
 
 protected:
   static QString num2str(double);
diff --git a/qucs-filter/quarterwave_filter.cpp b/qucs-filter/quarterwave_filter.cpp
index d48751c6..d664fd03 100644
--- a/qucs-filter/quarterwave_filter.cpp
+++ b/qucs-filter/quarterwave_filter.cpp
@@ -92,7 +92,11 @@ QString *QuarterWave_Filter::createSchematic(tFilter *Filter, tSubstrate *Substr
 
           c_s += getLineString(isMicrostrip, W_line, L_line, x, 180, 0); // Series line
           c_s += getTeeString(x+ 60 + x_space, 180, W_line, W_line, W_res);
-          c_s += getLineString(isMicrostrip, W_res, L_res, x+60 + x_space, 60, 1); // Shunt quarter-wavelength resonator
+          c_s += getLineString(isMicrostrip, W_res, L_res, x + 60 + x_space, 60, 1); // Shunt quarter-wavelength resonator
+
+          if (Filter->Class == CLASS_BANDSTOP){// If MS bandstop, add MOPEN
+              c_s += getMS_Open(W_res, x + 60 + x_space, 0, 1); // MS open
+          }
 
           w_s += getWireString(x+30, 180, x+30+x_space, 180);
           w_s += getWireString(x+60 + x_space, 90, x+60 + x_space, 150);
@@ -106,14 +110,15 @@ QString *QuarterWave_Filter::createSchematic(tFilter *Filter, tSubstrate *Substr
           w_s += getWireString(x+30, 180, x+90+2*x_space, 180);// Join series lines
           w_s += getWireString(x+60 + x_space, 90, x+60 + x_space, 180); // Join middle point with the stub
       }
-      if (Filter->Class == CLASS_BANDPASS) // If bandpass, shunt resonators
+      if (Filter->Class == CLASS_BANDPASS){
+          // If bandpass, shunt resonators
           if (isMicrostrip){
               c_s += getMS_Via(0.5, x+40 + x_space, 30, 2); // MS via diameter = 0.5 mm
           }
           else{
               c_s += QString("<GND * 1 %1 30 0 0 1 0>\n").arg(x + 60 + x_space);
           }
-
+      }
 
     x += 120 + 2 * x_space;
   }