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Yagi-Uda antenna History". History of antenna invention and its patents. D. Jefferies, "Yagi-Uda antennas Archived 2005-12-25 at the Wayback Machine". 2004. 'Yagi–Uda emitter used for AESA(active electronically scanned array)' low-frequency radars patents.google.com; Yagi-Uda Antenna. Simple information on basic design, project and measure of ...
Adding a reflector to a dipole, to make a 2 element Yagi, increases the gain by about 5 dB over the dipole. Adding a director to this, to give a 3 element Yagi, gives a gain of about 7 dB over a dipole. As a rule of thumb, each additional parasitic element beyond this adds about 1 dB of gain. [2]
It is easier to design a multiband quad antenna than a multiband Yagi antenna. Higher gain The 2-element quad has almost the same gain as a 3-element Yagi: about 7.5 dB over a dipole. Likewise, a 3-element quad has more gain than a 3-element Yagi. However, adding quad elements produces diminishing returns:
Also called a Moxon rectangle; it is a rectangular-shaped, folded version of a two-element Yagi-Uda, hence a minimal parasitic array. [14] Quad Although "quad" can refer to a single quadrilateral-shaped loop, the term usually refers to two or more loops stacked side by side as a parasitic array; at first glance, quads resemble a box kite frame.
It is a two element Yagi-Uda antenna with folded dipole elements, and no director(s). Because of the folded ends, the element lengths are approximately 70% of the equivalent dipole length. The two-element design gives modest directivity (about 2.0 dB ) with a null towards the rear of the antenna, yielding a high front-to-back ratio : Gain up to ...
[3] All practical antennas are at least somewhat directional, although usually only the direction in the plane parallel to the earth is considered, and practical antennas can easily be omnidirectional in one plane. The most common directional antenna types are [citation needed] the Yagi–Uda antenna, the log-periodic antenna, and
As with the Moxon antenna, the design omits the directors found in a Yagi-Uda. Its antenna gain is between 5dBi and 6dBi, the forward/reverse attenuation is up to 20 dB. The hexbeam consists of six arms of non-conductive materials such as fiberglass or plastic pipes, and insulated metallic wire is used to form the elements.
However, a Yagi with the same number of elements as a log-periodic would have far higher gain, as all of those elements are improving the gain of a single driven element. In its use as a television antenna, it was common to combine a log-periodic design for VHF with a Yagi for UHF, with both halves being roughly equal in size.
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