| 摘要 |
A logarithmic periodic antenna is constructed with antenna elements implanted in a single plane in or on a surface of an insulating substrate. The substrate supports the co-planar antenna elements and keeps them in the desired configuration. The antenna elements are arranged in pairs, with the elements of a given pair being on alternate sides of a center conductor. The center conductor consists of two conducting strips, or feeders, which run down the middle of the antenna structure. Each of the feeders connects to a different one of a pair of elements, and each feeder connects to alternating elements of consecutive pairs, for example, to the "left" element of one pair and the "right" element of the next pair. The logarithmic periodic antennas may be used, without signal degradation, as both transmitting and receiving antennas in split-frequency communications systems. These antennas, which have minimal back and side lobe amplitudes, may be configured in an array by being mounted on a single mast and at the same height.
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