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2. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   Horn A horn antenna has a flaring metal horn attached to a waveguide. It is a simple antenna with moderate gain of 15 to 25 dBi, used for applications such as radar guns, radiometers, and as feed antennas for parabolic dishes. Slot Consists of a waveguide with one or more slots cut in it to emit the microwaves. Linear slot antennas emit narrow ...

3. Horn antenna - Wikipedia

   en.wikipedia.org/wiki/Horn_antenna

   Another more recent horn-reflector design is the cass-horn, which is a combination of a horn with a cassegrain parabolic antenna using two reflectors. [ 25 ] 15-meter (50 ft) Holmdel horn antenna at Bell Labs in Holmdel, New Jersey, USA, with which Arno Penzias and Robert Wilson discovered cosmic microwave background radiation in 1964.

4. Parabolic antenna - Wikipedia

   en.wikipedia.org/wiki/Parabolic_antenna

   For a typical parabolic antenna, k is approximately 70. [14] For a typical 2 meter satellite dish operating on C band (4 GHz), this formula gives a beamwidth of about 2.6°. For the Arecibo antenna at 2.4 GHz, the beamwidth was 0.028°. Since parabolic antennas can produce very narrow beams, aiming them can be a problem.

5. Antenna feed - Wikipedia

   en.wikipedia.org/wiki/Antenna_feed

   The antenna feed system or antenna feed is the cable or conductor, and other associated equipment, which connects the transmitter or receiver with the antenna and makes the two devices compatible. [ 1 ] [ 2 ] In a radio transmitter, the transmitter generates an alternating current of radio frequency , and the feed system feeds the current to ...

6. Feed horn - Wikipedia

   en.wikipedia.org/wiki/Feed_horn

   Feed horn (right) on a military radar antenna. The feed horn must be shaped to produce a radiation pattern tailored to adequately illuminate the reflector. A feed horn (or feedhorn) is a small horn antenna used to couple a waveguide to e.g. a parabolic dish antenna or offset dish antenna for reception or transmission of microwaves.

7. Antenna measurement - Wikipedia

   en.wikipedia.org/wiki/Antenna_measurement

   One typical embodiment uses a horn feed antenna and a parabolic reflector to accomplish this. The CATR is used for microwave and millimeter wave frequencies where the 2 D 2 λ {\displaystyle \ {\frac {\ 2D^{2}\ }{\lambda }}\ } far-field distance is large, such as with high-gain reflector antennas.