**Waveguides**
==============

A *waveguide* is a structure that guides waves by restricting the transmission of energy
to one direction. Common types of waveguides include acoustic waveguides which direct
sound, optical waveguides which direct light, and radio-frequency waveguides which direct
electromagnetic waves other than light like radio waves.

.. _critical_wavelength_waveguide_def:

**Critical wavelength of waveguide**

The **critical wavelength** of a waveguide is such that signals with a wavelength
greater than the critical one become attenuated and do not propagate in the waveguide.

.. py:currentmodule:: symplyphysics.laws.electricity.circuits.waveguides

**Contents:**

.. toctree::
    :maxdepth: 4


    laws.electricity.circuits.waveguides.attenuation_coefficient_in_dielectric
    laws.electricity.circuits.waveguides.attenuation_coefficient_in_dielectric_in_rectangular_waveguide
    laws.electricity.circuits.waveguides.attenuation_coefficient_in_metal
    laws.electricity.circuits.waveguides.attenuation_coefficient_in_metal_in_rectangular_waveguide_for_transverse_electric_waves
    laws.electricity.circuits.waveguides.attenuation_coefficient_in_metal_in_rectangular_waveguide_for_transverse_magnetic_waves
    laws.electricity.circuits.waveguides.characteristic_resistance_of_rectangular_waveguide_for_transverse_electric_waves
    laws.electricity.circuits.waveguides.characteristic_resistance_of_rectangular_waveguide_for_transverse_magnetic_waves
    laws.electricity.circuits.waveguides.critical_wavelength_in_rectangular_waveguide
    laws.electricity.circuits.waveguides.group_velocity_of_wave_in_rectangular_waveguide
    laws.electricity.circuits.waveguides.maximum_electric_field_intensity_of_main_wave_in_rectangular_waveguide
    laws.electricity.circuits.waveguides.maximum_voltage_in_coaxial_line
    laws.electricity.circuits.waveguides.phase_velocity_of_wave_in_rectangular_waveguide
    laws.electricity.circuits.waveguides.power_carried_by_coaxial_waveguide
    laws.electricity.circuits.waveguides.power_carried_by_main_wave_of_rectangular_waveguide
    laws.electricity.circuits.waveguides.specific_capacitance_of_coaxial_waveguide
    laws.electricity.circuits.waveguides.specific_conductivity_of_coaxial_waveguide
    laws.electricity.circuits.waveguides.specific_inductance_of_coaxial_waveguide
    laws.electricity.circuits.waveguides.specific_resistance_of_coaxial_waveguide
    laws.electricity.circuits.waveguides.surface_resistance_of_metal
    laws.electricity.circuits.waveguides.wave_resistance_of_coaxial_waveguide
    laws.electricity.circuits.waveguides.wavelength_in_rectangular_waveguide