無載天線 的英文怎麼說
中文拼音 [wúzǎitiānxiàn]
無載天線
英文
unloaded antenna-
Associated with three research projects, this work is mainly concerned with array elements, array structure and calculations of array impedances versus operating frequencies. in the dissertation, the author ' s major contributions are as follows : a new types of array structure, known as circular reflection array, is proposed and studied. a detailed analysis to the new structure with two cases is presented
本文緊密結合「十五」國防預研「軟體無線電天線」和海軍預研「智能天線在艦艇上的應用」及「機載微帶天線」等項目，著重對智能天線陣列的陣列單元、陣列結構、陣列阻抗的頻率特性計算等技術進行了分析和研究，所取得的主要成果如下： 1However, in hf band, the band of the antennas is narrow, and the input impedance of monopole antenna with limited height undergoes rapid variation with frequency
但是，在hf頻段，有限高無加載單極子天線帶寬相對較窄，輸入阻抗隨頻率劇烈變化，難于和50的同軸饋線匹配。We manfucture cdma, gsm, phs base station antennas ; 800mhz trunking repeater digital antenna and indoor antennas ; wireless public telephone antennas ; the band antennas and microwave antennas
我公司生產終端天線（數字電視天線，車載娛樂系統天線，無線供話天線，網卡天線，手機天線） ； cdma ， gsm ， phs基站天線，室內信號分佈天線；微波天線等。In order to limit such mutual interference, the operators of the adjacent satellites will follow the radio regulations by itu, to take appropriate measures and limit the power density of the carriers, as well as the antenna size
為了限制相互之間的干擾，兩顆鄰星的操作者會按照國際電聯制訂的《無線電規則》 ，對載波功率譜密度和地面天線口徑作適當的限制。Recently, multiple input multiple output ( mimo ) system which originates from the employment of multiple antennas at transmitter and receiver has many advantages such as large system capacity, high spectral efficiency. on the other hand, orthogonal frequency division multiplexing ( ofdm ) which bases on the orthogonal transmission of sub - carriers also has some obvious merits such as strong anti - multipath ability, high spectral efficiency. the combination of the two techniques mimo - ofdm, has become a hotspot recently and regarded as promising technique for future next - generation mobile communication systems
近來，在無線通信系統中的收發兩端同時使用多根天線的多入多出（ mimo ， multiple - input - multiple - output ）通信結構，具有系統容量大、頻譜效率高等優點;基於正交的多路子載波并行傳輸的正交頻分復用（ ofdm ， orthogonalfrequencydivisionmultiplexing ）技術，具有抗多徑能力強、頻譜效率高等優點，二者的結合，即mimo - ofdm技術，被認為是構建下一代移動通信系統的框架技術。Photoenthusiasts could download digital images and video from their cameras to computers or home theaters via uwb wireless, eliminating the rat ' s nests of cables we often use today
影像狂熱人士只要透過超寬頻無線，就可以把相機里的數位影像和錄影畫面下載到電腦上或是家庭電影院里，而且不會有我們今天經常使用的纜線，像鼠窩般地糾結纏繞。分享友人