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The infrared part of the electromagnetic spectrum covers the range from roughly 300 GHz to 400 THz (1 mm – 750 nm). It can be divided into three parts: [1] Far-infrared, from 300 GHz to 30 THz (1 mm – 10 μm). The lower part of this range may also be called microwaves or terahertz waves.
This graph includes a range of frequencies from 0 to 1 THz; the microwaves are the subset in the range between 0.3 and 300 gigahertz. Microwaves travel solely by line-of-sight paths; unlike lower frequency radio waves, they do not travel as ground waves which follow the contour of the Earth, or reflect off the ionosphere ( skywaves ). [ 13 ]
Super high frequency (SHF) is the ITU designation [1] [2] for radio frequencies (RF) in the range between 3 and 30 gigahertz (GHz). This band of frequencies is also known as the centimetre band or centimetre wave as the wavelengths range from one to ten centimetres.
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
LC circuit equivalent for microwave resonant cavity. Microwave resonant cavities can be represented and thought of as simple LC circuits, see Montgomery et al pages 207-239. [15] For a microwave cavity, the stored electric energy is equal to the stored magnetic energy at resonance as is the case for a resonant LC circuit.
The actual range of parameters for which Douville and James present evidence is 0.25 ≤ w/h ≤ 2.75 and 2.5 ≤ ε r ≤ 25. They report a VSWR of better than 1.1 (i.e., a return loss better than −26 dB) for any percentage mitre within 4% (of the original d ) of that given by the formula.
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