Added divide by zero ignore for s11, s21, zin, yin

tools/plot_antenna_params.py

@@ -101,15 +101,19 @@ def calculate_antenna_params(filename, tltxnumber=1, tlrxnumber=None, rxnumber=N
     delaycorrection = np.exp(1j * 2 * np.pi * freqs * (dt / 2))
 
     # Calculate s11 and (optionally) s21
-    s11 = np.abs(np.fft.fft(Vref) / np.fft.fft(Vinc))
+    with np.errstate(divide='ignore'):
+        s11 = np.abs(np.fft.fft(Vref) / np.fft.fft(Vinc))
     if tlrxnumber or rxnumber:
-        s21 = np.abs(np.fft.fft(Vrec) / np.fft.fft(Vinc))
+        with np.errstate(divide='ignore'):
+            s21 = np.abs(np.fft.fft(Vrec) / np.fft.fft(Vinc))
 
     # Calculate input impedance
-    zin = (np.fft.fft(Vtotal) * delaycorrection) / np.fft.fft(Itotal)
+    with np.errstate(divide='ignore'):
+        zin = (np.fft.fft(Vtotal) * delaycorrection) / np.fft.fft(Itotal)
 
     # Calculate input admittance
-    yin = np.fft.fft(Itotal) / (np.fft.fft(Vtotal) * delaycorrection)
+    with np.errstate(divide='ignore'):
+        yin = np.fft.fft(Itotal) / (np.fft.fft(Vtotal) * delaycorrection)
 
     # Convert to decibels (ignore warning from taking a log of any zero values)
     with np.errstate(divide='ignore'):