Source: http://radiotec.ru/article/19837
Timestamp: 2019-04-25 21:56:57+00:00

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A Vivaldi antenna with corrugated side edges as alternative to the ultra-wideband petal-shaped radiator for multi-element video pulse scanning antenna array is considered. Using in radars of ultra-short video-pulse probing signals allow substantially to enlarge their technical characteristics. Particularly, low-frequency parts baseband spectrum of such signals (about some hundreds of MHz) contain a notable value of their power, which is less decayed in mediums with a loss. This circumstance permit in radars with pointed probing signals to detect objects under vegetation covers or underlying surfaces. It is obviously that antenna systems of such perspective radars in the form antenna array (AA) can have ultra-wideband radiator elements with working frequency range, corresponding to a probing signal spectrum. If a main lobe of AA must scan, then a partial radiation pattern of radiator elements must have specified width in the pointed planes.
Vivaldi antennas may be suitable for radiator elements of such AA. At that we have to notice that perfection of their feed part broaden working band mainly aside of upper frequencies, whereas decrease of lower frequencies is achieved usually only at the expense of the radiator lateral dimension.
The increase of antenna dimensions is always extremely undesirable, particularly for air-borne radars. This is the reason that so at-tractive idea to corrugate of Vivaldi antenna side edges to obtain improved low-frequency characteristics without antenna lateral di-mension increase. Unfortunately there is not a method for optimal corrugate edges in not numerous publications on that subject. And so in this article determination of slot numbers, their forms, arrangement and dimensions have been realized by rule of thumb. New corrugate edge variants of Vivaldi antennas are considered and for better of all standing-wave ration is determined in the working frequency band. CST Microwave Studio is used for simulation here.
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