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A frequency scanning array (Fig.9) has been made by placing a thin slot in the stub elements of a comb line [10] giving a beam scan of 3.4°/ percent frequency change at 17GHz with side lobe levels around -10dB. In the rampart line (Fig.10), mitred corners are taken as radiating elements and with appropriate spacing[11] , both linear and circular polarization can be obtained.
By making use of mutual coupling between two short circuited λm,/4 patches with their radiating edges adjacent, the
This has been made use, of in a circularly polarized bandwidth is increased to twice that of the single element.antenna for an aircraft NAVSTAR receiving system shown in Fig. 11 for low angle radiation[12]. By series feeding an array of patch radiators so that their size and spacing increases log periodically, a new wide-band antenna has been formed[13]. The results of a feasibility study on such an antenna using electro- magnetic coupling to overlaid patches are shown, together with a sketch of the antenna, in Fig.12. Pattern control limits the available bandwidth for this nine-element array to about 30 percent.

2007-11-19 17:58:51 · 4 個解答 · 發問者 Meggie 1 in 社會與文化 語言

有沒有不是翻譯軟體翻的~比較人性化一點

2007-11-19 18:21:16 · update #1

4 個解答

用同一個翻譯機器的當然一樣

2007-11-20 19:29:38 · answer #1 · answered by Ken 4 · 0 0

回答的兩位大大怎麼番的一模一樣

2007-11-19 18:44:50 · answer #2 · answered by michaelfnck 3 · 0 0

依知識+的規定﹐一次翻譯量不可以超過5行﹐ 也不可以變相方式將同一篇文章以每5行分開發問﹐請參考
http://tw.help.yahoo.com/know/question/question-19.html
如果我違規回答﹐而且也被選為「最佳解答」之後, 你的版面遲早還是會遭人檢舉並被管理員「強制移除」﹐移除後﹐我的「最佳解答」記錄就會被一筆勾銷﹐等於做白工﹐因此﹐有實力的人不會回應你發問。如果需要我服務﹐請與我聯絡(利用「寄信給他」的功能)﹐我會給你變通的解決之道。

2007-11-19 18:15:24 · answer #3 · answered by november_kimo 7 · 0 0

頻率掃描列陣(Fig.9) 由安置做了一個稀薄的槽孔在梳子的殘餘部分元素排行[ 10 ] 給3.4./ 百分之頻率變動射線掃瞄在17GHz 以旁邊耳垂水平在-10dB 附近。在壘線(Fig.10), 被斜接的角落被採取作為放熱元素和與適當的spacing[11 ], 線性並且圓極化可能被獲得。由利用相互聯結在二之間短的巡迴的?m, /4 補釘以他們放熱邊緣毗鄰, 這做了用途, 對圓地被對立的帶寬增加到兩次那唯一element.antenna 為航空器NAVSTAR 接受系統被顯示在圖11 為低角度radiation[12 ] 。由系列哺養一一些補釘幅射器以便他們的大小和間距增量階段性地採伐, 新多種頻率的天線是formed[13 ] 。可行性研究的結果關於這樣天線的使用表的磁性聯結對overlaid 補釘被顯示, 與天線的剪影一起, 在Fig.12 。樣式控制極限可利用的帶寬為這個九元素列陣對大約百分之30

2007-11-19 18:06:15 · answer #4 · answered by Benny 2 · 0 0

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