Corner reflector antenna - Wikipedia, the free encyclopedia. Construction of typical corner reflector antenna. A corner reflector antenna is a type of directional antenna used at VHF and UHF frequencies.[1][2] It was invented by John D. Kraus in 1. 93. 8.[3][4] It consists of a dipoledriven element mounted in front of two flat rectangular reflecting screens joined at an angle, usually 9.
В°.[1] Corner reflectors have moderate gain of 1. B,[2] high front- to- back ratio of 2. B, and wide bandwidth. They are widely used for UHF television receiving antennas, point- to- point communication links and data links for wireless WANs, and amateur radio antennas on the 1. MHz bands.[2] They radiate linearly polarized radio waves and can be mounted for either horizontal or vertical polarization.
The corner reflector antenna should not be confused with a corner reflector, a passive device used to reflect radio waves back toward the source. The flat reflecting surfaces can be metal sheets, but are more often made of wire screen or rod elements parallel to the driven element, to reduce weight and wind loads on the antenna.[2] The angle Оё between the sides is most commonly 9. В°.[1] The gain increases as the angle narrows, but the increase below 9. В° is minimal, and requires longer reflector screens be used.
3 Felber: “Fractal Antennas” ABSTRACT Fractal antenna theory is built, as is the case with conventional antenna theory, on.
Chapter 2 ELECTROMAGNETIC HORN ANTENNAS Paul Wade N1BWT © 1994,1998 A horn antenna is the ideal choice for a rover station. It offers moderate gain in a small. Loop Efficiency (Kempton) May 2006 2 Why Measure Antenna Efficiency? • Do we trust Simulations more than Measurements? • Can measurements ‘validate’ or.
A corner reflector antenna is a type of directional antenna used at VHF and UHF frequencies. [1] [2] It was invented by John D. Kraus in 1938. [3] [4] It consists of.
However, angles down to 4. В° have been used.[2]The spacing (S) of the driven element in front of the point where the reflectors meet is approximately 0. О» but is not very critical; for 9.
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В° antennas the gain doesn't vary more than 1. B for S between 0. О» and 0. 7. 5О».[2][1] The radiation resistance of the dipole increases with this spacing, so the spacing can be adjusted to match the driven element to the feed line.[2] Bowtie driven elements are often used for wide bandwidth applications like television antennas.[1]The antenna can be regarded as a form with a gain intermediate between a plane reflective array antenna and a parabolic antenna. It is particularly suitable in applications where a broadband directional antenna around one to 1 1/2 wavelengths in size is needed.[5] A parabolic dish this size has no advantage in gain over the corner reflector, so its simplicity of design and construction make it attractive. Variations[edit]The single driven element can be replaced by a Yagi array.
UHF Yagi television antennas very often use a corner reflector. These antennas actually function more like two separate antennas: the corner reflector and driven element serves to provide broad bandwidth gain at the lower end of the UHF band, while the Yagi array is cut to give extra gain at the high end of the band. Monopole versions for use at lower frequencies have been built by placing vertical reflecting screens behind a vertical monopole antenna. MHz homemade corner reflector. Corner reflector UHF TV antenna from 1. Modern UHF TV antenna consisting of 3 Yagi arrays in front of a common corner reflector. Large 1. 20 ft high two bay corner reflector antenna for military troposcatter communication link, Massachusetts, 1.
The words antenna (plural: antennas [2] in US English, although both 'antennas' and 'antennae' are used in International English [3]) and aerial are used interchangeably. This paper presents a motion-free technique for characterizing the focal length of any spherical convex or concave lens. The measurement system uses a Gaussian Beam.
Dual stacked corner reflector UHF TV antenna. Stacking 2 antennas increases horizontal gain 3 d. B. Vertical monopole corner reflector for HF transmission. References[edit]^ abcde. Stutzman, Warren L.; Thiele, Gary A. Antenna Theory and Design. John Wiley and Sons.
ISBN 9. 78. 04. 70. Straw, R. Dean (2.
The ARRL Antenna Book (1. American Radio Relay League. ISBN 0. 87. 25. 98. John D. Kraus, US patent 2. Corner reflector antenna, filed January 3. January 2. 0, 1. 94. Kraus, John D. (1.
Antennas(PDF) (2 ed.). Tata- Mc. Graw Hill. ISBN 0. 07. 03. 54.
Kraus, John D. (November 1. The square- corner reflector beam antenna for ultra high frequencies"(PDF). QST (USA: American Radio Relay League). Retrieved June 2, 2. Further reading[edit].