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据美国防部 G·Gamoto 在1980年的美应用超导电会议上宣称,国防部所属的海军实验室已成功地制出潜艇水上通讯用甚低频小型超导天线系统。众所周知,比30赫更低的电磁波不仅可以绕地球传播,而且还可沿洋面水域传播。随着频率的降低,电磁波在水中的趋肤深度增大。因而,潜艇与潜艇、潜艇与海岸指挥机关即可利用甚低频(30～300赫)
According to G. Gamoto, US Department of Defense, at the 1980 US Conference on Applied Superconductivity, the Department of Defense’s naval laboratory has successfully produced very small-scale, very small, superconducting antenna systems for submarine waterborne communications. It is well known that electromagnetic waves lower than 30 Hz can not only circumnavigate the Earth but also spread along the ocean surface waters. As the frequency decreases, the skin depth of electromagnetic waves in the water increases. Thus, submarines and submarines, submarines and coastal command organs can make use of very low frequency (30 ~ 300 Hz)