Research and development efforts have been underway for several years to explore a novel antenna concept that can directly accept microwave energy in an azimuthally symmetric mode , with a boresight peak 本文從理論推導(dǎo)、數(shù)值仿真等方面研究了后兩類(lèi)天線,即可以直接輻射軸對(duì)稱(chēng)模式高功率微波的天線- vlasov天線和cobra天線。
Many high - power microwave ( hpm ) sources utilize an azimuthally symmetric output mode such as the tm 01 circular waveguide or the coaxial tem mode as output mode . if radiated directly these azimuthally symmetric modes will generate a doughnut - shaped pattern , with a null on boresight 許多高功率微波源產(chǎn)生的微波模式都是圓波導(dǎo)軸對(duì)稱(chēng)模式,由于其輸出端口的口徑場(chǎng)分布具有圓對(duì)稱(chēng)性,將導(dǎo)致軸向?yàn)榱愕沫h(huán)狀遠(yuǎn)場(chǎng)方向圖。
The extension suggested by the author and his colleagues includes : application of the tunneling technique should not restricted to carrying layer 2 protocols also for other layer protocols ; application modes for tunneling should include the symmetric mode ( i . e . between terminals and between servers ) . indeed , in the later stage of our research , ietf published a new draft standard called l2tpv3 ( in 2003 ) , and the second extension as suggested above has been added in 本論文對(duì)早期第二層隧道協(xié)議擴(kuò)展建議的思路包括:將隧道中繼的思想拓寬到包括二層協(xié)議在內(nèi)的各層協(xié)議的包裝中繼的應(yīng)用范圍;將傳統(tǒng)隧道中繼限于非對(duì)稱(chēng)應(yīng)用模式(即終端對(duì)服務(wù)器的訪問(wèn)模式)推廣到兩類(lèi)對(duì)稱(chēng)應(yīng)用模式(終端對(duì)終端和服務(wù)器對(duì)服務(wù)器) 。