Electronic – this symbol, and it belong to which-system or convensions

antennasymbol [~]transmission line

Common textbook symbol antenna

This is a very common- symbol used in school-textbooks as a symbol for antenna.

This website (http://www.chegg.com/homework-help/questions-and-answers/figure-shows-arrangement-generating-traveling-electromagnetic-wave-shortwave-radio-region–q1017746) mentioned this as the symbol of Transmission line.

enter image description here (http://s3.amazonaws.com/answer-board-image/8700a5dc-2c5e-473c-89d3-2a6dde823364.gif).

However, I did-not found any information about this symbol in google and wikipedia. As well, outside school-textbooks I yet not seen this symbol in any professional circuit diagram. What is this symbol? and in which sign-convention it is/was used?

Best Answer

This symbol is the common way to draw a twisted pair.

Note that this is common, in literature, and very intuitive, but this isn't the standard way.

This is a twisted pair in standards:

enter image description here

And this is antenna:

enter image description here

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