ANTENA YAGI UDA PDF

When working at Tohoku University , he wrote several articles that introduced a new antenna designed by his colleague Shintaro Uda to the English-speaking world. The Yagi antenna , patented in , allows directional communication using electromagnetic waves , and is now installed on millions of houses throughout the world for radio and television reception. He participated in establishing the Chiba Institute of Technology. He was the fourth president of Osaka University from February to December

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Documentation Help Center. The yagiUda class creates a classic Yagi-Uda array comprised of an exciter, reflector, and N - directors along the z-axis. The reflector and directors create a traveling wave structure that results in a directional radiation pattern. The exciter, reflector, and directors have equal widths and are related to the diameter of an equivalent cylindrical structure by the equation.

For a given cylinder radius, use the cylinder2strip utility function to calculate the equivalent width. A typical Yagi-Uda antenna array uses folded dipole as an exciter, due to its high impedance. The Yagi-Uda is center-fed and the feed point coincides with the origin. In place of a folded dipole, you can also use a planar dipole as an exciter. The default Yagi-Uda uses folded dipole as three directors, one reflector, and a folded dipole as an exciter. By default, the dimensions are chosen for an operating frequency of MHz.

Name is the property name and Value is the corresponding value. You can specify several name-value pair arguments in any order as Name1 , Value1 , Properties not specified retain default values. Antenna Type used as exciter, specified as the comma-separated pair consisting of 'Exciter' and an object.

Example: 'Exciter',dipole. Example: 'NumDirectors', Example: 'DirectorLength',[0. Example: 'DirectorSpacing',[0. Example: 'ReflectorLength',0. Example: 'ReflectorSpacing', 0. Lumped elements added to the antenna feed, specified as a lumped element object handle. For more information, see lumpedElement. Example: 'Load',lumpedelement. Example: yu. Tilt angle of the antenna, specified as a scalar or vector with each element unit in degrees. For more information, see Rotate Antennas and Arrays.

Example: 'Tilt', Example: ant. Example: 'Tilt',[90 90] , 'TiltAxis',[0 1 0;0 1 1] tilts the antenna at 90 degrees about the two axes, defined by vectors. The wireStack antenna object only accepts the dot method to change its properties. Three-element vectors of Cartesian coordinates in meters. In this case, each vector starts at the origin and lies along the specified points on the X-, Y-, and Z-axes. Two points in space, each specified as three-element vectors of Cartesian coordinates.

In this case, the antenna rotates around the line joining the two points in space. A string input describing simple rotations around one of the principal axes, 'X', 'Y', or 'Z'. Example: 'TiltAxis',[0 1 0]. Example: 'TiltAxis',[0 0 0;0 1 0]. Plot the radiation pattern of a Yagi-Uda array antenna at a frequency of MHz.

Antenna Theory. Analysis and Design , 3rd Ed. New York: Wiley, A modified version of this example exists on your system. Do you want to open this version instead? Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:. Select the China site in Chinese or English for best site performance. Other MathWorks country sites are not optimized for visits from your location.

Toggle Main Navigation. Search Support Support MathWorks. Search MathWorks. Off-Canvas Navigation Menu Toggle. Description The yagiUda class creates a classic Yagi-Uda array comprised of an exciter, reflector, and N - directors along the z-axis. Properties expand all Exciter — Antenna type used as exciter dipoleFolded default object. NumDirectors — Total number of director elements 3 default scalar.

Total number of director elements, specified as a scalar. Note Number of director elements should be less than or equal to DirectorLength — Director length 0. Director length, specified as a scalar or vector in meters. DirectorSpacing — Spacing between directors 0. Spacing between directors, specified as a scalar or vector in meters. ReflectorLength — Reflector length 0. Reflector length, specified as a scalar in meters. ReflectorSpacing — Spacing between exciter and reflector 0.

Spacing between exciter and reflector, specified as a scalar in meters. Load — Lumped elements [1x1 LumpedElement] default lumped element object handle.

Tilt — Tilt angle of antenna 0 default scalar vector. Example: 'Tilt',90 Example: ant. Note The wireStack antenna object only accepts the dot method to change its properties. TiltAxis — Tilt axis of antenna [1 0 0] default three-element vector of Cartesian coordinates two three-element vectors of Cartesian coordinates 'X' 'Y' 'Z'.

Tilt axis of the antenna, specified as: Three-element vectors of Cartesian coordinates in meters. Open Live Script. Calculate Cylinder to Strip Approximation. References [1] Balanis, C. No, overwrite the modified version Yes.

Select a Web Site Choose a web site to get translated content where available and see local events and offers. Select web site. Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays.

Radiation pattern and phase of antenna or array; Embedded pattern of antenna element in array.

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Yagi Antenna Theory: Yagi Antenna Basics

In understanding the basic Yagi antenna theory, the different elements of the Yagi antenna react in a complex and interrelated way. One of the major keys to understanding Yagi theory is a knowledge of the phases of the currents flowing in the different elements of the antenna. The parasitic elements of the Yagi antenna operate by re-radiating their signals in a slightly different phase to that of the driven element. In this way the signal is reinforced in some directions and cancelled out in others. As the additional antenna elements in the Yagi are not directly driven but pick up power from the driven element, these additional elements are referred to as parasitic elements. One limitation of the design of Yagi anennas is that the power in these additional elements is not directly driven.

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Hidetsugu Yagi

Documentation Help Center. The yagiUda class creates a classic Yagi-Uda array comprised of an exciter, reflector, and N - directors along the z-axis. The reflector and directors create a traveling wave structure that results in a directional radiation pattern. The exciter, reflector, and directors have equal widths and are related to the diameter of an equivalent cylindrical structure by the equation. For a given cylinder radius, use the cylinder2strip utility function to calculate the equivalent width. A typical Yagi-Uda antenna array uses folded dipole as an exciter, due to its high impedance. The Yagi-Uda is center-fed and the feed point coincides with the origin.

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Yagi–Uda antenna

A Yagi—Uda antenna , commonly known as a Yagi antenna , is a directional antenna consisting of multiple parallel elements in a line, [1] usually half-wave dipoles made of metal rods. The reflector element is slightly longer than the driven dipole, whereas the directors are a little shorter. The waves from the multiple elements superpose and interfere to enhance radiation in a single direction, achieving a very substantial increase in the antenna's gain compared to a simple dipole. The largest and best-known use is as rooftop terrestrial television antennas , [3] but it is also used for point-to-point fixed communication links, [2] in radar antennas, [4] and for long distance shortwave communication by shortwave broadcasting stations and radio amateurs. The antenna was invented in by Shintaro Uda of Tohoku Imperial University , Japan , [5] with a lesser role played by his colleague Hidetsugu Yagi. However the "Yagi" name has become more familiar with the name of Uda often omitted.

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Category:Yagi-Uda antennas

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