frequency bandwidth造句
例句與造句
- 20m frequency bandwidth occupied by the data flow : 20 188 204 2 1 . 35 16 . 7m
20m數(shù)據(jù)流所占用的頻率帶寬為： - The minimum detectable electric field strength is 10 ~ 20 mv / m at frequency bandwidth of 3 hz . the dynamic range is 80 db at 250 mhz
在200mhz的頻率下的全向性達(dá)到3db , 2ghz頻率下全向性為1 . 5db 。 - Switching power amplifier is popularly used because of its virtues of low power losses , high efficiency and high frequency bandwidth
開關(guān)型功率放大器因其損耗小、效率高、通頻帶寬等優(yōu)點(diǎn)，廣泛取代了早期低效率的線性功放，成為目前功率放大器研究的重點(diǎn)。 - Comparing with the system which does not space - time code , space - time coding can obtain transmit diversity and increase channel capacity without frequency bandwidth loss
與空間未編碼系統(tǒng)相比,空時(shí)編碼可以在不犧牲帶寬的情況下起到發(fā)射分集和提高功率增益的作用。 - Artificial neural network ( ann ) method is proposed to use in active control system after the analysis of the effective frequency bandwidth of tmd control system
在分析了被動(dòng)tmd用于風(fēng)振控制存在有效頻帶窄的問題后，提出了采用神經(jīng)網(wǎng)絡(luò)提供主動(dòng)控制力的主動(dòng)控制方法。 - It's difficult to find frequency bandwidth in a sentence. 用frequency bandwidth造句挺難的
- As far as the wide slot antenna is concerned , a broad s11 - 10db frequency bandwidth of 158 % and an operating frequency band of 1 . 9 ~ 16 . 25 ghz are produced by applying this method to it
對寬槽天線而言,應(yīng)用這種方法得到了阻抗帶寬為158 %的超寬帶寬槽天線,工作頻率為1 . 9 ~ 16 . 25ghz 。 - The relationship between the body dynamic frequency bandwidth and the precision of the dynamic surveying with incomplete inertial sensors is clarified which can be a guideline for practical inertial system designs
通過頻域分析，闡明了載體姿態(tài)運(yùn)動(dòng)頻帶寬度與動(dòng)態(tài)測量精度的關(guān)系，對實(shí)際工程中慣性系統(tǒng)設(shè)計(jì)具有重要的指導(dǎo)作用。 - Usually the frequency bandwidth of microstrip patch antenna is relatively narrow . however , it can be effectively broadened with the employment of the micro - electro - mechanism systems technique to fabricate microstrip antenna with multilayer dielectric substrates and patch
通常微帶貼片天線的頻帶較窄，而利用微電子機(jī)械系統(tǒng)（ mems ）技術(shù)制作具有多層介質(zhì)和貼片結(jié)構(gòu)的微帶天線，可以有效地?cái)U(kuò)展天線的帶寬。 - The vertical delay stacked source obtains optimum matching with wall rock by controlling the charge mode and the excitation velocity , and maximum utilizes its energy . thus the seismic signal with the high frequency abundance and frequency bandwidth wide be obtained
垂直延遲迭加震源通過控制裝藥方式和控制炸藥速度來達(dá)到與圍巖的最佳匹配，最大限度的利用其激發(fā)的能量，激發(fā)出高頻成份豐富、頻帶寬、高頻能量高的地震信號(hào)。 - Become a kind of new electronics circuit - current - mode circuit . it is replacing the traditional design method of the voltage - mode in the high frequency high - speed signal processing realm 。 this thesis mainly discussed the modified second - generation current conveyors based on the current - mode kinds of new cuicuit components , they are stronger modified standard current - mode parts in fuctions on this foundation . mainly including the modified differential difference current conveyor ( mddccii ) 、 the fully balanced second generation current conveyor ( fbccii ) 、 ( full balances ) four - terminal floating nullor ( fbftfn ) and the current differencing buffered amplifier ( cdba ) , they are all function very strong standard current - mode parts , they all can provide some circuit functions of better than general operation amplifier , because they have the voltage importation and the current importation , therefore use it since can carry out the voltage - mode signal processing circuit expediently , can also carry out the current - mode signal processing circuit expediently , and have to increase the benefit bandwidth to accumulate more widely than the voltage - mode , but have their advantages more according to the current - mode filter of the modified current conveyor , because it constitutes in brief , the filter wave function is stronger and they are better than in general use operation amplifier of many advantages , be easy to composing for example 、 high speed 、 frequency bandwidth 、 the power supply voltage requests low 、 consume small , the impedance is different from etc . advantages , otherwise they have biggish dynamic range , and flexible circuit synthesize , so they are the best active parts
從第二代電流傳輸器ccii入手,重點(diǎn)研究了以下幾種改進(jìn)型的第二代電流傳輸器:改進(jìn)的差動(dòng)差分電流傳輸器mddccii 、全平衡第二代電流傳輸器fbccii 、多輸出四端浮地零器ftfn 、全平衡四端浮地零器fbftfn 、電流差分緩沖放大器cdba的電路結(jié)構(gòu)及其模型。然后在此基礎(chǔ)上系統(tǒng)地研究了基于這幾種改進(jìn)型的第二代電流傳輸器的濾波器的設(shè)計(jì)方法,主要方法和結(jié)果如下:利用mddccii設(shè)計(jì)了差分式連續(xù)時(shí)間電流模式低通、帶通濾波器;電流模式跳耦結(jié)構(gòu)考爾低通濾波器;利用fbccii設(shè)計(jì)了帶通二階節(jié)濾波器及電流模式雙二階通用濾波器;設(shè)計(jì)了基于多輸出端ftfn的電流模式二階通用濾波器電路;通過數(shù)字化開關(guān)選擇的基于fbftfn的電流模式通用濾波器;設(shè)計(jì)了基于最少個(gè)數(shù)電流緩沖放大器(兩個(gè)cdba )的多功能通用電流模式濾波器及其在非理想因素情況下分析。設(shè)計(jì)濾波器的主要方法是采用級聯(lián)設(shè)計(jì)、運(yùn)算模擬(信號(hào)流圖法)和反饋設(shè)計(jì)(跳耦法) 。 - In order to solve this problem , this research adopts the electrical self - regulation circuit in series , on the basis of the unchanged of transfer function of electromagnetism rate transducer , extend frequency bandwidth of the transducer , improving its capability . after the self - regulation , the transducer has high passing feature and inferior lower lever cut - off frequency ( below 1 hz )
為了解決普通電磁式速度傳感器不能檢測超低頻振動(dòng)信號(hào)的問題,本研究采用了一種串聯(lián)式電子補(bǔ)償電路,在保持電磁式速度傳感器的傳遞函數(shù)性質(zhì)(高通)不變的前提下,拓展了傳感器的頻寬,改善了傳感器的性能。 - Simulation comparisons verify the superior performance of the tri - state pwm technology . experimental results indicate that the current - controlled tri - state pwm switching power amplifier based on sample - hold strategy has high frequency bandwidth and fast dynamic response in a wide load range , which can well meet the demands of high - speed magnetic bearing
仿真結(jié)果驗(yàn)證了電流三態(tài)調(diào)制技術(shù)的優(yōu)越性能；實(shí)驗(yàn)表明本文研制的基于采樣-保持策略電流三態(tài)調(diào)制開關(guān)功放具有結(jié)構(gòu)簡單、效率高、紋波小、電流動(dòng)態(tài)響應(yīng)快、頻帶寬、受負(fù)載影響小等優(yōu)點(diǎn)，能很好地滿足高速磁軸承的要求。 - A patch antenna with air holes in the substrate has been designed . the finite - difference time - domain ( fdtd ) method together with the perfectly matched layer ( pml ) boundary treatment has been used to study the performance of the antenna . it is shown that the surface waves are significiently suppressed , the frequency bandwidth is improved , the sidelobe levels are reduced and consequently the gain in the forward direction is improved by 14 db ( about 4 db higher than the value reported previously )
設(shè)計(jì)了一種基底鉆周期圓孔結(jié)構(gòu)的電磁(光子)晶體貼片天線，用fdtd方法并結(jié)合pml吸收邊界條件對該天線進(jìn)行了研究，結(jié)果表明本文所設(shè)計(jì)的基底鉆孔型電磁晶體貼片天線取得了多方面的性能改善，與普通天線相比，基底中的表面波受到很大抑制，天線的帶寬增加，遠(yuǎn)場方向圖上天線的旁瓣和背瓣被明顯削弱，向前輻射的增益由原來的12db增加到26db ，增加了14db ，比文獻(xiàn)上報(bào)道的gonzalo等人的研究結(jié)果提高了4db 。 - The modulating signal is generated in the way of direct digital synthesizer technology . the signal has many characteristics such as ultra wide frequency bandwidth , ultra high frequency resolution and ultra good phasic continuity , etc . thus it can be achieved the high frequency and amplitude stability of the modulating signal
本文采用了數(shù)字頻率合成技術(shù)( dds )來產(chǎn)生調(diào)制信號(hào),它具有超寬的頻率帶寬、超高的頻率分辨率和相位連續(xù)性等特點(diǎn),可以實(shí)現(xiàn)聲光調(diào)制信號(hào)的頻率和振幅的高穩(wěn)定性。 - We design the qmf based on the criteria of minimum frequency bandwidth and the qmf that possess linear phase , and give a example of a signal decomposed and restructured . 4 . in the research of channel dropping filters , we use 5 rank butterworth filter to approach the digital filter . we design lc unpower netwok and rc power network . we manufacture lc lowpass and highpass filter ， and test their performance ; we simulate the appliance of the channel dropping filters in the system
4 .在頻帶分割濾波器的設(shè)計(jì)方法中，用5階巴特沃斯濾波器逼近最小頻寬正交鏡像濾波器，對無源和有源濾波器進(jìn)行了仿真設(shè)計(jì)；設(shè)計(jì)并制作了無源lc低通和高通濾波器，測試了它們的性能；并對分割濾波器在系統(tǒng)中的應(yīng)用進(jìn)行了計(jì)算機(jī)仿真。