How does a slotted waveguide antenna work?
How does a slotted waveguide antenna work?
A slot antenna consists of a metal surface, usually a flat plate, with one or more holes or slots cut out. When the plate is driven as an antenna by an applied radio frequency current, the slot radiates electromagnetic waves in a way similar to a dipole antenna.
Where are slot antennas most often used How is a slot antenna driven?
Slot antennas are often used at UHF and microwave frequencies instead of line antennas when greater control of the radiation pattern is required.
What is a slotted waveguide?
From Wikipedia, the free encyclopedia. A slot-waveguide is an optical waveguide that guides strongly confined light in a subwavelength-scale low refractive index region by total internal reflection.
Is an antenna a waveguide?
Antennas receive or radiate signal. Waveguide conveys signal from one place to another, similar to a wire or cable.
What is a waveguide slot array antenna?
A waveguide slot array antenna is mainly used for high gain flat antennas in millimeter-wave wireless communication systems due to their unique features such as lower loss in comparison with microstrip antennas, and simpler structure compared with reflector antennas [2].
What is the geometry of a slot antenna?
Geometry of the most common slotted waveguide antenna. The front end (the open face at the y=0 in the x-z plane) is where the antenna is fed. The far end is usually shorted (enclosed in metal). The waveguide may be excited by a short dipole (as seen on the cavity-backed slot antenna) page, or by another waveguide.
What is the frequency characteristics of a slotted waveguide?
To give an idea of the frequency characteristics of a slotted waveguide, a sample measurement of S11 as a function of frequency will be shown. The waveguide is designed to operate at 10 GHz. It is fed by a coaxial feed at the bottom as shown in Figure 4. Figure 4. Slotted waveguide antenna fed by a coaxial feed.
What is the input impedance of a waveguide?
The input impedance of the waveguide is a function of the slot impedance. Note that the above design parameters are only valid at a single frequency. As the frequency departs from where the waveguide was designed to work, there will be degradation in the performance of the antenna.
