adj.双线的，双丝的，双股的
A new backfire antenna fed by a bifilar backfire belix is described in this Paper.
本文提出一种用双线背射螺旋作馈源的新式背射天线.
The element employs a bifilar wound wire grid on an insulating substrate.
元件系用双股绕线网缠绕在一块绝缘基板上.
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