Updated text descriptions of plotting modules.

tools/Jupyter notebooks/plot_antenna_params.ipynb

@@ -6,7 +6,9 @@
    "source": [
     "# Plotting antenna parameters\n",
     "\n",
-    "In the ``tools`` sub-package is a module called ``plot_antenna_params`` which can be used to plot parameters from a model containing an antenna. The antenna in the model must be fed using the ``#transmission_line`` command and can optionally, include a receiver antenna with a ``#rx`` command. The module takes an argument which is the name of the output file and several optional arguments:\n",
+    "In the ``tools`` sub-package is a module called ``plot_antenna_params`` which can be used to plot parameters from a model containing an antenna. These include s11 and, optionally, s21 as well as the input impedance. The module will also plot incident, reflected, and total voltages and currents at the antenna terminals. \n",
+    "\n",
+    "The antenna in the model must be fed using the ``#transmission_line`` command and can, optionally, include a receiver antenna with a ``#rx`` command (for s21 parameter calculation). The module takes an argument which is the name of the output file and several optional arguments:\n",
     "\n",
     "* ``--tl-num`` is the transmission line number of the transmitting antenna (default=1)\n",
     "* ``--rx-num`` is the receiver number for the receiver antenna (default=None)\n",