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2. Sector antenna - Wikipedia

   en.wikipedia.org/wiki/Sector_antenna

   Typical GSM sector antenna outdoor unit. A sector antenna is a type of directional microwave antenna with a sector-shaped radiation pattern.The word "sector" is used in the geometric sense; some portion of the circumference of a circle measured in degrees of arc. 60°, 90° and 120° designs are typical, often with a few degrees 'extra' to ensure overlap and mounted in multiples when wider or ...

3. Waveguide (radio frequency) - Wikipedia

   en.wikipedia.org/wiki/Waveguide_(radio_frequency)

   In radio-frequency engineering and communications engineering, a waveguide is a hollow metal pipe used to carry radio waves. [1] This type of waveguide is used as a transmission line mostly at microwave frequencies, for such purposes as connecting microwave transmitters and receivers to their antennas, in equipment such as microwave ovens, radar sets, satellite communications, and microwave ...

4. All American Five - Wikipedia

   en.wikipedia.org/wiki/All_American_Five

   The term All American Five (abbreviated AA5) is a colloquial name for mass-produced, superheterodyne radio receivers that used five vacuum tubes in their design. These radio sets were designed to receive amplitude modulation (AM) broadcasts in the medium wave band, and were manufactured in the United States from the mid-1930s until the early 1960s.

5. Microwave antenna - Wikipedia

   en.wikipedia.org/wiki/Microwave_antenna

   Radio bands where microwave antennas are commonly deployed in 2016 FCC [2] C band: 4 to 8 GHz: 3.75 cm to 7.5 cm 4 GHz, 6 GHz X band: 8 to 12 GHz: 25 mm to 37.5 mm 10 GHz, 11 GHz K u band: 12 to 18 GHz: 16.7 mm to 25 mm 12 GHz, 18 GHz K band: 18 to 26.5 GHz: 11.3 mm to 16.7 mm 18 GHz K a band: 26.5 to 40 GHz: 5.0 mm to 11.3 mm 23 GHz, 31 GHz Q band

6. Lens antenna - Wikipedia

   en.wikipedia.org/wiki/Lens_antenna

   Beginning the same year, Indian physicist Jagadish Chandra Bose in his landmark 6–60 GHz (50–5 mm) microwave experiments may have been the first to construct lens antennas, using a 2.5 cm cylindrical sulfur lens in a waveguide to collimate the microwave beam from his spark oscillator, [13] and patenting a receiving antenna consisting of a ...

7. Globalstar - Wikipedia

   en.wikipedia.org/wiki/Globalstar

   On March 6, 2021, Globalstar announced to customers that the Sat-Fi2 (Satellite Wifi Hotspot) and Sat-Fi2 RAS (Remote Antenna Station) services would be discontinued as of March 12, 2021. On September 7, 2022, Apple announced a cooperation with Globalstar Inc that "would allow iPhone 14 users to send emergency messages" via satellite, starting ...