right now Insertion loss is computed on first frequency point. (#4416)

Co-authored-by: maxcapodi78 <Shark78>

pyaedt/generic/touchstone_parser.py

@@ -105,13 +105,16 @@ def get_insertion_loss_index(self, threshold=-3):
 
         """
         temp_list = []
-        freq_idx = 0
-        s_db = self.s_db[freq_idx, :, :]
+        s_db = self.s_db[0:2, :, :]
         for i in self.port_tuples:
             if i[0] != i[1]:
-                loss = s_db[i[0], i[1]]
+                loss = s_db[0, i[0], i[1]]
                 if loss > threshold:
                     temp_list.append(i)
+                elif loss < -90:
+                    loss = s_db[1, i[0], i[1]]
+                    if loss > threshold:
+                        temp_list.append(i)
         return temp_list
 
     def plot_insertion_losses(self, threshold=-3, plot=True):