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A three-element Yagi–Uda antenna used for long-distance communication in the shortwave bands by an amateur radio station. The longer reflector element ( left ), the driven element ( centre ), and the shorter director ( right ) each have a so-called trap (parallel LC circuit ) inserted along their conductors on each side, allowing the antenna ...
Polar plots of the horizontal cross sections of a (virtual) Yagi–Uda antenna. The outline connects points with equal field power. The radiation pattern of an antenna is a plot of the relative field strength of the radio waves emitted by the antenna at different angles in the far field. It is typically represented by a three-dimensional graph ...
The Yagi-Uda antenna, patented in 1926, allows directional transmission using radio waves, and is especially useful in the very high frequency and ultra high frequency radio bands . Antennas of this type were widely used for television and radio reception, and are still common in communication and radar systems.
Layout of Moxon antenna; radiates strongest towards the left. [a] The Moxon antenna design is rectangular, with slightly less than half of the rectangle being the driven element (radiator) and the other part (slightly more than half) being the reflector. It is a two element Yagi-Uda antenna with folded dipole elements, and no director(s).
A quad antenna is a type of directional wire radio antenna used on the HF and VHF bands. A quad is a Yagi–Uda antenna ("Yagi") made from loop elements instead of dipoles: It consists of a driven element and one or more parasitic elements ; however in a quad, each of the loop elements may be square, round, or some other shape.
Quad antennas are Yagi-Uda antennas made from loops instead of dipoles or monopoles, and are likewise used as a directional antennas on the HF bands for shortwave communication. They are sometimes preferred for longer wavelengths because (if square) they are half as wide as a Yagi built from dipoles and have slightly better directivity.