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#19
March 23rd 10, 12:27 PM
posted to rec.radio.amateur.antenna
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Radiation penetration/absorbtion
Richard Fry wrote:
On Mar 22, 8:56 pm, tom wrote: Do you have any web references to gridded cavity antennas? A good source is the paper from which I posted a few "fair use" clips, and was published in the Sept 1979 edition of the IEEE Transactions on Broadcasting. I'm not aware of any web link to it, and it is a copyrighted work. But probably your local public library would be able to access it through inter-library services, and provide you with a copy. This design was developed by Harris Corporation, and has evolved/ improved over the years especially in the crossed-dipole element used to excite the cavity. The design is now available through several manufacturers. The first link below shows a description of it from the 2004 catalog of Dielectric Communications, who bought the design from Harris. The picture shows an array of 12 layers of 3-around cavities that was built by Harris as a master FM antenna (9 stations) for the Senior Road Tower Group in Houston. The second link below shows the measured axial ratio for an omnidirectional version of the antenna. http://i62.photobucket.com/albums/h8...vity_Array.gif http://i62.photobucket.com/albums/h8...xial_Ratio.gif RF Thanks. Gives me plenty to start from. tom K0TAR |
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