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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>福建省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>開(kāi)封車(chē)載天線(xiàn),天線(xiàn)</p><p><span>***更新：</span>2020-09-20 07:02:21</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="n4kmjyp" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">泉州市天陸通信科技有限公司</a></p><p><span>聯(lián)系人：</span>景經(jīng)理</p><p><span>郵箱: </span>3131314848@qq.com</p><p><span>電話(huà): </span>18520272999</p><p><span>傳真: </span>0595_22002867</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>0595-22001867</p><p><span>地址: </span>福建省泉州市豐澤區(qū)北峰工業(yè)區(qū)豐盛路20號(hào) </p><p>[當(dāng)前離線(xiàn)] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="28rtak8" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="ezgyvc3" class="box"><p><p style="text-indent:25px">車(chē)載天線(xiàn)是指設(shè)計(jì)安裝在車(chē)輛上的移動(dòng)通訊天線(xiàn)，zui常見(jiàn)就是吸盤(pán)天線(xiàn)。由于吸盤(pán)天線(xiàn)安裝擺放容易，所以在一些簡(jiǎn)易設(shè)臺(tái)場(chǎng)合常常用吸盤(pán)天線(xiàn)代替基地天線(xiàn)。車(chē)載天線(xiàn)結(jié)構(gòu)上有縮短型、四分之一波長(zhǎng)、中部加感型、八分之五波長(zhǎng)、雙二分之一波長(zhǎng)等形式的天線(xiàn)，理論上它們的效率依次增加，同樣工作頻段的天線(xiàn)的長(zhǎng)度也依次增加。由于車(chē)輛本身有限高，加上過(guò)長(zhǎng)的天線(xiàn)在車(chē)輛高速行進(jìn)時(shí)形成的風(fēng)阻，過(guò)橋洞、進(jìn)入地下車(chē)庫(kù)都是問(wèn)題，所以車(chē)載天線(xiàn)并不是越長(zhǎng)越好，一般要求轎車(chē)天線(xiàn)不超過(guò)70厘米，面包車(chē)類(lèi)要求天線(xiàn)更短?？s短型天線(xiàn)體積小巧，雖然增益不高，但適合使用于需要隱蔽天線(xiàn)的場(chǎng)合。一般的*車(chē)輛建議安裝高增天線(xiàn)，尤其是在活動(dòng)區(qū)域范圍比較大的車(chē)輛，350MHZ高增益天線(xiàn)多分為八分之五波長(zhǎng)加感的形式，開(kāi)封車(chē)載天線(xiàn)，在距天線(xiàn)頂部二分之一波長(zhǎng)距離處有一個(gè)加感線(xiàn)圈。400MHZ頻段雙二分之一波長(zhǎng)天線(xiàn)具有較高的增益，它的外觀特征是天線(xiàn)的振子上有兩個(gè)加感線(xiàn)圈。八分之五波長(zhǎng)天線(xiàn)和中部加感型天線(xiàn)也有較高的增益，且價(jià)格比較便宜，因此得到廣的使用。在作為臨時(shí)固定臺(tái)天線(xiàn)使用的場(chǎng)合可以考慮選用增益高的吸盤(pán)天線(xiàn)，開(kāi)封車(chē)載天線(xiàn)，天線(xiàn)的長(zhǎng)度不必有過(guò)多限制，開(kāi)封車(chē)載天線(xiàn)。天線(xiàn)不可放在室內(nèi)使用，同時(shí)也造成高駐波。還有害人體。開(kāi)封車(chē)載天線(xiàn)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="開(kāi)封車(chē)載天線(xiàn),天線(xiàn)" src="http://tyunfile.71360.com/UpLoadFile/2019/11/27/9/637104422094453986_qztl_9965526.jpg"></div><p> 天線(xiàn)的作用與地位 </p> <p> 無(wú)線(xiàn)電發(fā)射機(jī)輸出的射頻信號(hào)功率，通過(guò)饋線(xiàn)（電纜）輸送到天線(xiàn)，由天線(xiàn)以電磁波形式輻射出去。電磁波到達(dá)接收地點(diǎn)后，由天線(xiàn)接下來(lái)（**接收很小很小一部分功率），并通過(guò)饋線(xiàn)送到無(wú)線(xiàn)電接收機(jī)?？梢?jiàn)，天線(xiàn)是發(fā)射和接收電磁波的一個(gè)重要的無(wú)線(xiàn)電設(shè)備，沒(méi)有天線(xiàn)也就沒(méi)有無(wú)線(xiàn)電通信。天線(xiàn)品種繁多，以供不同頻率、不同用途、不同場(chǎng)合、不同要求等不同情況下使用。對(duì)于眾多品種的天線(xiàn)，進(jìn)行適當(dāng)?shù)姆诸?lèi)是必要的：按用途分類(lèi)，可分為通信天線(xiàn)、電視天線(xiàn)、雷達(dá)天線(xiàn)等；按工作頻段分類(lèi)，可分為短波天線(xiàn)、超短波天線(xiàn)、微波天線(xiàn)等；按方向性分類(lèi)，可分為全向天線(xiàn)、定向天線(xiàn)等；按外形分類(lèi)，可分為線(xiàn)狀天線(xiàn)、面狀天線(xiàn)等；等等分類(lèi)。潮州5G天線(xiàn)GPS天線(xiàn)就是指通過(guò)接受衛(wèi)星信號(hào),從而進(jìn)行定位或者導(dǎo)航所用到的天線(xiàn).影響GPS天線(xiàn)有哪些因素呢？</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="開(kāi)封車(chē)載天線(xiàn),天線(xiàn)" src="http://tyunfile.71360.com/UpLoadFile/2019/11/27/9/637104422023928519_qztl_7147621.jpg"></div><p style="text-indent:25px">保護(hù)車(chē)載天線(xiàn)需要注意哪些？ ?天線(xiàn)處于車(chē)頂正中位置時(shí)發(fā)射效果比較好，但是這樣的話(huà)天線(xiàn)很高，過(guò)隧道或林蔭路的時(shí)候容易被掛到天線(xiàn)。下面請(qǐng)看車(chē)載天線(xiàn)需要注意哪些？ ?1：不使用仿造天線(xiàn)（因?yàn)橘|(zhì)量沒(méi)有保證），要么用鉆石天線(xiàn)，要么就用協(xié)會(huì)天線(xiàn)。保證天線(xiàn)本身具有1.5以下的駐波比。并且保證阻抗，電抗匹配。 ?2：天線(xiàn)不可以放倒使用，放倒以后駐波會(huì)很大，損傷機(jī)器。 ?3：天線(xiàn)不可放在室內(nèi)使用，同時(shí)也造成高駐波。還有害人體。 ?4：盡量不要總是拆卸天線(xiàn)，日久容易造成接觸不良產(chǎn)生高駐波，影響機(jī)器壽命。 ?5：下雨天注意接頭不能夠進(jìn)水，如果進(jìn)水，也會(huì)駐波高。平時(shí)也注意接頭的檢查。有沒(méi)有松曠的狀況。 ?6：經(jīng)常檢查饋線(xiàn)出車(chē)端，有沒(méi)有破損，如果有破損建議更換，因?yàn)橐矔?huì)造成電波泄漏，形成駐波，危害人體。如果斷了的就不能發(fā)射了。 ?7：車(chē)隊(duì)或者近距離通聯(lián)用小功率發(fā)射，也會(huì)增加車(chē)臺(tái)使用壽命。也對(duì)自己的健康有益。 ?8：如果是車(chē)載天線(xiàn)，車(chē)上的整流器對(duì)電瓶的輸出電壓要保證在15V以下。平時(shí)可以用電表測(cè)量。需要注意的是：熄火的時(shí)候電壓一般在12.5V左右，待速的電壓應(yīng)該在13.5V左右，提高轉(zhuǎn)速3千轉(zhuǎn)，只要不超過(guò)14V就說(shuō)明整流器沒(méi)有問(wèn)題。電臺(tái)也會(huì)得到很好的保護(hù)。 </p><p> GPS天線(xiàn)的分類(lèi) </p> <p> 1 如果是從極化方式上來(lái)看的話(huà)，GPS天線(xiàn)大致能夠分為垂直計(jì)劃以及圓形極化。 </p> <p> 如果**是以目前的技術(shù)，垂直極化的效果還是比不上圓形極化的。故除非是特殊情況，普通的GPS天線(xiàn)基本都是采用圓形極化。 </p> <p> ⒉如果是從放置方式來(lái)分，那么GPS天線(xiàn)能夠分為內(nèi)置天線(xiàn)以及外置天線(xiàn)。 </p> <p> 其實(shí)天線(xiàn)的裝配位置是非常重要的，在早期的時(shí)候GPS手持機(jī)基本都是采用外翻式的天線(xiàn)，而這時(shí)候天線(xiàn)和整機(jī)的內(nèi)部基本上都是隔離的，而EMI則幾乎不會(huì)對(duì)其造成任何的影響，而且收星的效果非常的好。而如今由于小型化的潮流，GPS天線(xiàn)基本都是采用的內(nèi)置，那么天線(xiàn)則必須要在所有金屬器件上方，殼內(nèi)還需要進(jìn)行電鍍同時(shí)進(jìn)行良好的接地，遠(yuǎn)離EMI干擾源，例如CPU、SD卡、SDRAM、晶振、DC/DC。按方向性分類(lèi)，可分為全向天線(xiàn)、定向天線(xiàn)等；</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="開(kāi)封車(chē)載天線(xiàn),天線(xiàn)" src="http://tyunfile.71360.com/UpLoadFile/2019/11/27/9/637104422024084813_qztl_8772465.jpg"></div><p> WIFI天線(xiàn)有怎樣的作用?WIFI天線(xiàn)能夠分作兩種，內(nèi)置天線(xiàn)和外置天線(xiàn)，內(nèi)置天線(xiàn)作用于手機(jī)電腦、投影儀，路由器等等。外置天線(xiàn)作用于路由器，機(jī)頂盒，基站，攝像頭等等，很多人會(huì)有疑惑，這種WIFI天線(xiàn)有什么作用呢。天線(xiàn)是發(fā)射和接收電磁波的一個(gè)重要設(shè)備，天線(xiàn)把接收到的信號(hào)傳給之后輸出?，F(xiàn)在的路由器等很多產(chǎn)品都需求安裝wifi天線(xiàn)，沒(méi)有天線(xiàn)承受信號(hào)的才能就很差，簡(jiǎn)單影響上網(wǎng)速度。小音響沒(méi)有一個(gè)WIFI天線(xiàn)，接收到的信號(hào)距離會(huì)很短。網(wǎng)絡(luò)的盛行也帶動(dòng)了wifi天線(xiàn)的開(kāi)展，在信號(hào)較弱的地區(qū)運(yùn)用作用很大，能**增強(qiáng)無(wú)線(xiàn)信號(hào)。曾經(jīng)的路由器只是一根天線(xiàn)，現(xiàn)在已經(jīng)開(kāi)展到兩根、三根。沒(méi)有天線(xiàn)路由器接收的信號(hào)很差，給工作和學(xué)習(xí)帶來(lái)很大影響，所以它的作用還是很重要的。4G天線(xiàn)的分析是判定給定4G天線(xiàn)結(jié)構(gòu)的方向和阻抗特性。開(kāi)封車(chē)載天線(xiàn)</p><p style="text-indent:25px">3G天線(xiàn)向集成化方向開(kāi)展。開(kāi)封車(chē)載天線(xiàn)</p><p> 4G天線(xiàn)的規(guī)劃面臨著哪些挑戰(zhàn)?有很多要素會(huì)影響手持移動(dòng)通訊設(shè)備的4G天線(xiàn)功用。雖然這些要素是有關(guān)的，但一般可以分紅三大類(lèi)：天線(xiàn)標(biāo)準(zhǔn)、多副天線(xiàn)之間的互耦以及設(shè)備運(yùn)用模型。天線(xiàn)標(biāo)準(zhǔn)天線(xiàn)標(biāo)準(zhǔn)取決于三個(gè)要素：作業(yè)帶寬、作業(yè)頻率和輻射功率。的帶寬懇求越來(lái)越高，其推動(dòng)力來(lái)自美國(guó)的FCC頻率分配和全球范圍內(nèi)的運(yùn)營(yíng)商周游協(xié)議；不相同區(qū)域運(yùn)用不相同的頻段。‘帶寬和天線(xiàn)標(biāo)準(zhǔn)是直接有關(guān)的’且‘功率和天線(xiàn)標(biāo)準(zhǔn)是直接有關(guān)的’--這一般意味著，更大標(biāo)準(zhǔn)的天線(xiàn)可以供給更大的帶寬和更高的功率。除了帶寬外，天線(xiàn)標(biāo)準(zhǔn)還取決于作業(yè)頻率。在北美區(qū)域，運(yùn)營(yíng)商VerizonWireless和AT&TMobility挑選推廣的LTE商品作業(yè)在700MHz頻段，這在幾年前是FCCUHF-TV再分配頻段的一部分。這些新的頻段（17，704－746MHz和13，746－786MHz）比北美運(yùn)用的傳統(tǒng)蜂窩頻段（5，824－894MHz）要低。這個(gè)改變是無(wú)窮的，因?yàn)轭l率越低，波長(zhǎng)越長(zhǎng)，因此需求更長(zhǎng)的天線(xiàn)才干堅(jiān)持輻射功率不變。為了保證輻射功率，天線(xiàn)標(biāo)準(zhǔn)有必要做大。但是，設(shè)備體系規(guī)劃人員還需求增加更大的顯示器和更多的功用，因此可用的天線(xiàn)長(zhǎng)度和悉數(shù)體積遭到極大束縛，然后降低了天線(xiàn)帶寬和功率。開(kāi)封車(chē)載天線(xiàn)</p><p style="text-indent:25px">泉州市天陸通信科技有限公司位于福建省泉州市豐澤區(qū)北峰工業(yè)區(qū)豐盛路20號(hào) 。公司自成立以來(lái)，以質(zhì)量為發(fā)展，讓匠心彌散在每個(gè)細(xì)節(jié)，公司旗下玻璃鋼天線(xiàn)，車(chē)載天線(xiàn)，船舶天線(xiàn)，對(duì)講機(jī)天線(xiàn)深受客戶(hù)的喜愛(ài)。公司從事通信產(chǎn)品多年，有著創(chuàng)新的設(shè)計(jì)、強(qiáng)大的技術(shù)，還有一批**的專(zhuān)業(yè)化的隊(duì)伍，確保為客戶(hù)提供良好的產(chǎn)品及服務(wù)。泉州市天陸通信憑借創(chuàng)新的產(chǎn)品、專(zhuān)業(yè)的服務(wù)、眾多的成功案例積累起來(lái)的聲譽(yù)和口碑，讓企業(yè)發(fā)展再上新高。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/1351193.html</p></div></div></div></div></div><div id="wamj7rw" class="page-right twoColRt"><div id="pe8mdkr" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="nxpmofh" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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