What is the purpose of a waveguide?

A waveguide is a structure that guides waves, such as electromagnetic waves or sound, with minimal loss of energy by restricting the transmission of energy to one direction.

What is a waveguide antenna?

A beam waveguide antenna is a particular type of antenna dish, at which waveguides are used to transmit the radio beam between the large steerable dish and the equipment for reception or transmission, like e.g. RF power amplifiers.

What is waveguide wavelength?

Guide wavelength is defined as the distance between two equal phase planes along the waveguide. The guide wavelength is a function of operating wavelength (or frequency) and the lower cutoff wavelength, and is always longer than the wavelength would be in free-space.

What is a rectangular waveguide?

A rectangular waveguide is a hollow metallic tube with a rectangular cross section. The conducting walls of the waveguide confine the electromagnetic fields and thereby guide the electromagnetic wave. TE modes (Transverse Electric) have no electric field component in the direction of propagation.

How are waveguides used in a microwave transmitter?

Waveguides are metallic transmission lines that are used at microwave frequencies, typically to interconnect transmitters and receivers (transceivers) with antennas. OK, some purists will tell you that waveguide is not a transmission line, because it doesn’t have two conductors, but we don’t draw such a distinction here.

Which is an example of a waveguide antenna?

Typical waveguide application: antenna feed for military radar. In the microwave region of the electromagnetic spectrum, a waveguide normally consists of a hollow metallic conductor. These waveguides can take the form of single conductors with or without a dielectric coating, e.g. the Goubau line and helical waveguides.

What are the disadvantages of a microwave waveguide?

It is completely shielded (excellent isolation between adjacent signals can be obtained), it can transmit extremely high peak powers and it has very low loss (often almost negligible) at microwave frequencies. One disadvantage of waveguide is its high cost.

How is a DFW converted to a substrate integrated waveguide?

Therefore a new concept emerged: substrate integrated waveguide. SIW is a transition between microstrip and dielectric-filled waveguide (DFW). Dielectric filled waveguide is converted to substrate integrated waveguide (SIW) by the help of vias for the side walls of the waveguide.