Air Force Colors Volume 3: Pacific & Home Front 1942-1947 - by Dana Bell

By Dana Bell

Air strength colours Vol 3:1945-47

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Additional resources for Air Force Colors Volume 3: Pacific & Home Front 1942-1947 - Specials series (6152)

Sample text

DB relative to 1m 2); G is the boresight gain (in dB); and Fis the operating frequency (in MHz). 6 is a nomograph which can be used to determine the gain of an antenna from its diameter and the operating frequency. Note that this is specifically for a 55% efficient antenna. 5-m-diameter antenna with 55% efficiency will have a gain of approximately 32 dB at 10 GHz. This nomograph assumes that the surface of the dish is a parabola accurate to a small part of a wavelength at the operating frequency; otherwise, there is a gain reduction.

There is a relationship between the size of an antenna's reflector, the operating frequency, the efficiency, the effective antenna area, and the gain. This relationship is presented below in several useful forms. 4 shows the gain versus the beamwidth of a parabolic antenna with 55% efficiency. This efficiency is what you expect in a commercially available antenna which covers a relatively small frequency bandwidth (about 10%). "{ c ' ,: . ,<\(;'. 8 1 2 4 6 8 10 3-d8 8eamwidth in Degrees 20 40 60 100 There is a well-defined tradeoff of gain versus beamwidth for any type of antenna.

When used as a receiving antenna array, the phase shifters cause a signal received from the selected direction to add in phase at the signal combiner.

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