Resistance of microstrip line
=============================

The resistance of the microstrip line depends on the physical dimensions of the
microstrip and the resistance of its surface.

..
    TODO: find link

.. py:currentmodule:: symplyphysics.laws.electricity.circuits.transmission_lines.microstrip_lines.microstrip_line_resistance

.. py:data:: resistance

    :attr:`~symplyphysics.symbols.electrodynamics.electrical_resistance` of the microstrip line.

Symbol:
    :code:`R`

Latex:
    :math:`R`

Dimension:
    :code:`impedance`


.. py:data:: length

    :attr:`~symplyphysics.symbols.classical_mechanics.length` of the microstrip.

Symbol:
    :code:`l`

Latex:
    :math:`l`

Dimension:
    :code:`length`


.. py:data:: width

    Width (see :attr:`~symplyphysics.symbols.classical_mechanics.length`) of the microstrip.

Symbol:
    :code:`w`

Latex:
    :math:`w`

Dimension:
    :code:`length`


.. py:data:: thickness

    :attr:`~symplyphysics.symbols.classical_mechanics.thickness` of the microstrip.

Symbol:
    :code:`t`

Latex:
    :math:`t`

Dimension:
    :code:`length`


.. py:data:: surface_resistance

    :attr:`~symplyphysics.symbols.electrodynamics.electrical_resistance` of the surface of the microstrip.

Symbol:
    :code:`R_s`

Latex:
    :math:`R_\text{s}`

Dimension:
    :code:`impedance`


.. py:data:: law

    :code:`R = (1.4 + 0.217 * log(w / (5 * t))) * R_s * l / (2 * (w + t))`


    Latex:
        .. math::
            R = \left(1.4 + 0.217 \log \left( \frac{w}{5 t} \right)\right) \frac{R_\text{s} l}{2 \left(w + t\right)}