What Material Can the Reflector on Hdtv Antenna Be Made of
A corner reflector antenna is a type of directional antenna used at VHF and UHF frequencies.Information technology was invented by John D. Kraus in 1938.[3] [four] Information technology consists of a dipole driven element mounted in front of two flat rectangular reflecting screens joined at an angle, ordinarily ninety°.Corner reflectors have moderate gain of 10-xv dB, high front end-to-dorsum ratio of xx-xxx dB, and wide bandwidth. They are widely used for UHF telly receiving antennas, point-to-betoken advice links and data links for wireless WANs, and amateur radio antennas on the 144, 420, and 1296 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 exist confused with a corner reflector, a passive device used to reflect radio waves back toward the source.
The apartment reflecting surfaces can be metallic sheets, simply are more oft made of wire screen or rod elements parallel to the driven element, to reduce weight and wind loads on the antenna The angle θbetwixt the sides is well-nigh normally 90°. The gain increases equally the angle narrows, merely the increment beneath ninety° is minimal, and requires longer reflector screens exist used. All the same, angles downwardly to 45° have been used.
The spacing (S) of the driven chemical element in front of the point where the reflectors come across is approximately 0.5λ but is not very critical; for 90° antennas the proceeds doesn't vary more than 1.5 dB for S betwixt 0.25λ and 0.75λ.The radiation resistance of the dipole increases with this spacing, so the spacing tin be adjusted to match the driven element to the feed line.[two] Bowtie driven elements are often used for broad bandwidth applications like television antennas.
The antenna tin can be regarded as a form with a gain intermediate between a plane reflective array antenna and aparabolic antenna. It is particularly suitable in applications where a broadband directional antenna around one to i one/2 wavelengths in size is needed.A parabolic dish this size has no reward in gain over the corner reflector, so its simplicity of design and construction make it attractive.
Source:WIKIPEDIA
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