vhf band 中文意思是什麼

vhf band 解釋
甚高頻帶
  • vhf : vhf ＝ very high frequency 【無線電】甚高頻。
  • band : n 1 帶，繩；帶形物；箍；箍條；嵌條；鑲邊；鋸條； 〈pl 〉 （法官等的）寬領帶。2 束縛，羈絆；義務；...
  1. Proposed by the european broadcasting union, eureka 147 is widely applied in europe, canada and part of asia. the technology operates in the new l - band or vhf band iii. its 1. 5 mhz bandwidth can accommodate a maximum of about 1. 2 mbps of data

    Eureka147是現時歐洲廣播聯會（ europeanbroadcastingunion ）推廣的制式，被歐洲、加拿大和部份亞洲地區所採用，它的設計是需要另外在新的Ｌ頻帶或甚高頻帶vhfbandiii操作，頻寬1
  2. Rthk tested dab in l band in 1998. since then, dab technologies have undergone improvements ; rthks current test of dab vhf band iii is expected to offer a better indoor and outdoor performance. moreover, the price of the receivers has gone down substantially

    港臺於1998年測試dab時，是以l頻帶l band進行，這幾年來dab技術上有所改進，今次dab測試極高頻帶vhf band iii ，相信有較佳的室內和室外接收的效果，而接收器的價格也經已回落。
  3. Many technologies of electrically small antennas and wide band antennas are discussed in theory, simulation and experiment. and some novel electrically small or wide band antennas are proposed. the loaded monopole is analyzed in depth integrating the genetic algorithm ( ga ) with the method of moments ( mom ) in order to increase the gain and decrease the vswr of antennas used at hf / vhf band

    在本論文的研究過程中，通過合理利用各種現有的天線寬帶化和小型化的理論成果、有效的綜合各種技術措施，運用矩量法和遺傳優化演算法等數值方法，深入研究了加載單極子天線問題，旨在全面提高高頻/甚高頻頻段內的天線增益和降低電壓駐波比，以獲得較高增益的、基本滿足駐波要求的小型超寬帶天線。
  4. Upstream channels cover in 5 65mhz, which is a part of the bandwidth of high frequency （ hf ） and very high frequency （ vhf ）. it is liable to incur noises ingress onto the band. since hfc system has the tree - and - branch topology between the fiber - node and subscriber units, subscriber units belonging to one fiber - node share the same upstream channel, forming the " noise funneling " effect

    上行頻帶位於5 - 65mhz之間，這一頻帶為高頻（ hf ）和甚高頻（ vhf ）的一部分，此頻帶易受噪聲干擾；此外，由於從光節點到用戶端為樹型分支結構，同一光節點的多個用戶共享同一通道，形成了漏斗效應。
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