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A quad antenna is a self-resonant loop in a square shape; this one also includes a parasitic element.. Loop antennas may be in the shape of a circle, a square, or any other closed geometric shape that allows the total perimeter to be slightly more than one wavelength.
the upper half of a vertical full-wavelength loop antenna mounted on the ground (not to be confused with the visually similar but electrically different half-square antenna described below, under array antennas, [t] nor to be confused with the halo antenna, described next). The full loop is cut at two opposite points along its perimeter, and ...
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
In the radiation diagram (left) the square, light grey full-wave loop has maximum signal (magenta) broadside to its wires, with nulls off the left and right sides of the diagram; the small loop is the light grey octagon, with its maximum signal within the plane of the antenna-wire octagon, with nulls (black center point) broadside to them.
As can be seen in the above table, for linear antennas shorter than their fundamental resonant length (shorter than 1 / 2 λ for a dipole antenna, 1 / 4 λ for a monopole) the radiation resistance decreases with the square of their length; [24] for loop antennas the change is even more extreme, with sub-resonant loops ...
Flat antennas may have a stand or could be hung on a wall or a window. [15] Internally, the thin, flat square is a loop antenna with its circular metallic wiring embedded into conductive plastic. [citation needed]
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