Waveguide – Definition and Pronunciation
What is Waveguide?
Waveguide is a material medium (a transmission line) that confines and guides a propagating electromagnetic wave. At microwave frequencies, a waveguide normally consists of a hollow metallic conductor (pipe), usually rectangular, elliptical, or circular in cross-section. The cross-section area depends on the frequency: higher frequencies require smaller cross-sectional areas. This type of waveguide may, under certain conditions, contain a solid or gaseous dielectric material. It is typically used in earth stations to connect the HPAs to the antenna.
Examples of Waveguide
It was shown that wave scattering on random inhomogeneities of the refractive index leads to a non-coherent redistribution of the energy between the waveguide modes, the loss of coherence results in additional attenuation of the trapped modes. Using the language of quantum mechanics, we have found the perturbations to the eigenvalues of the discrete spectrum of the localised states.
From “Scattering Mechanism of Over-horizon UHF Propagation”.
The measured data for frequencies 65, 170, 520 and 3 300 MHz have been compared with the theory for the respective frequencies. The elevated M-inversion forms the single mode waveguide at the frequency 65 MHz.
From “Comparison of Experimental Results with the Deterministic Theory of Elevated Duct Propagation”.
The major reason for this is that such a waveguide has a multi-mode or multi-ray nature that, in turn, may require a different approach to obtaining the analytical solution, depending on the geometry of the problem (positions of the transmitter and receiver relative to the elevated duct “boundaries”, range and frequency).
From “Impact of Elevated M-inversions on the UHF/EHF Field Propagation beyond the Horizon”.
Pronunciation of Waveguide
