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2. Horn antenna - Wikipedia

   en.wikipedia.org/wiki/Horn_antenna

   Pyramidal horn (fig. a) – a horn antenna with the horn in the shape of a four-sided pyramid, with a rectangular cross section. They are a common type, used with rectangular waveguides, and radiate linearly polarized radio waves. [12] Sectoral horn – A pyramidal horn with only one pair of sides flared and the other pair parallel. It produces ...

3. Harold Irving Ewen - Wikipedia

   en.wikipedia.org/wiki/Harold_Irving_Ewen

   With a $500 grant from the AAA&S, Ewen was able to purchase components to construct a pyramidal horn antenna and a 21-cm receiver. With the instrument assembled, a galactic 21-cm signal was successfully detected on March 25, 1951. [6] This unexpected result was soon confirmed by Dutch and Australian astronomers. [8]

4. File:Horn antenna types.svg - Wikipedia

   en.wikipedia.org/wiki/File:Horn_antenna_types.svg

   English: Common types of horn antenna. They are: (a) Pyramidal horn (b) E-plane sectoral horn (c) H-plane sectoral horn (d) Conical horn (e) Exponential horn. Date: 6 ...

5. 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 ...

6. Radiation pattern - Wikipedia

   en.wikipedia.org/wiki/Radiation_pattern

   The top shows the directive pattern of a horn antenna, the bottom shows the omnidirectional pattern of a simple vertical dipole antenna. In the field of antenna design the term radiation pattern (or antenna pattern or far-field pattern) refers to the directional (angular) dependence of the strength of the radio waves from the antenna or other ...

7. Direction finding - Wikipedia

   en.wikipedia.org/wiki/Direction_finding

   [26]: 257 For a rectangular horn, Gain ≈ 30000/BW h.BW v, where BW h and BW v are the horizontal and vertical antenna beamwidths, respectively, in degrees. For a circular aperture, with beamwidth BW c, it is Gain ≈ 30000/BW c 2. Two antenna types, popular for DF, are cavity-backed spirals and horn antennas.