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2. Beam waveguide antenna - Wikipedia

   en.wikipedia.org/wiki/Beam_waveguide_antenna

   The first full scale beam waveguide antenna was the 64 meter antenna at the Usuda Deep Space Center, Japan, built in 1984 by the Japan Aerospace Exploration Agency. [6] After the Jet Propulsion Lab (JPL) tested this antenna and found it better than their conventional 64-meter antennas, [ 7 ] they too switched to this method of construction for ...

3. Moxon antenna - Wikipedia

   en.wikipedia.org/wiki/Moxon_antenna

   Moxon antenna for the 20-meter band.The antenna is the faint rectangle of wires held in tension by the bent X-shaped support frame. Moxon antenna for the 2-meter band. The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. [1]

4. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   The nulls in the radiation pattern of small receiving loops and ferrite core antennas are bi-directional, and are much sharper than the directions of maximum power of either loop or of linear antennas, and even most beam antennas; the null directionality of small loops is comparable to the maximal directionality of large dish antennas (aperture ...

5. Parabolic antenna - Wikipedia

   en.wikipedia.org/wiki/Parabolic_antenna

   The curved ends of the reflector are sometimes capped by flat plates, to prevent radiation out the ends, and this is called a pillbox antenna or cheese antenna. Shaped-beam antennas – Modern reflector antennas can be designed to produce a beam or beams of a particular shape, rather than just the narrow "pencil" or "fan" beams of the simple ...

6. Directional antenna - Wikipedia

   en.wikipedia.org/wiki/Directional_antenna

   Patch antenna gain pattern. A directional antenna or beam antenna is an antenna which radiates or receives greater radio wave power in specific directions. Directional antennas can radiate radio waves in beams, when greater concentration of radiation in a certain direction is desired, or in receiving antennas receive radio waves from one specific direction only.

7. CfA 1.2 m Millimeter-Wave Telescope - Wikipedia

   en.wikipedia.org/wiki/CfA_1.2_m_Millimeter-Wave...

   The 1.2 meter Millimeter ... this allowed the mini to mimic a smaller antenna with a half-degree beam. ... is 8.4+/-0.2 arcmin and the main beam efficiency 82%. The ...