MODEL TESTS OF A SURFACE-WAVE TRANSMISSION LINE FOR LONG DISTANCE COMMUNICATION,
SIGNAL CORPS ENGINEERING LABS FORT MONMOUTH N J
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It appears entirely possible to construct a Surface-Wave Transmission Line SWTL for long distance transmission with 100 Mc or more bandwidth having an average loss of 3 to 5 db per mile. For instance, if the conductor diameter is 0.4 inch and the outer diameter of the line 1 inch, and if the dielectric layer consists of natural polyethylene with a light protecting coat, the calculated loss is 2.2 dbmile at 100 Mcs and 3.4 dbmile at 200 Mcs. The actual loss will be about 10 higher due to imperfections of the conductor surface which are always present. If the supporting loss is 0.5 dbmile then the loss of a straight line section will be about 3 dbmile at 100 Mcs and 4.2 dbmile at 200 Mcs. At these frequencies the line is not affected by rain. Dry snow and thin layers of ice have little effect on the transmission loss. Therefore such a line should be applicable in areas where severe icing conditions occur rarely or not at all.
- Electrical and Electronic Equipment
- Non-Radio Communications