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clearfix"><section class="container clearfix tcPro"><section class="home-main container clearfix"><div id="pjp5nlj" class="twoCol"><div id="tnbptr3" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_txcp/">通信產(chǎn)品</a>?<a href="http://www.cdcfah.com/cp/second-txcp_tianxianyk/">天線</a>?<a href="http://www.cdcfah.com/cp/third-tianxianyk_txtxhv/">通信天線</a>?蘇州玻璃鋼天線歡迎咨詢泉州市天陸通信科技供應(yīng)</p><div id="v5bhxlh" class="leftbox clearfix"><h1>蘇州玻璃鋼天線歡迎咨詢泉州市天陸通信科技供應(yīng)</h1><div id="3xvlzf5" class="proBig"><div id="tp3jhdp" class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/27/9/637104422024553695_qztl_8905960.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="5bj7pft" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/27/9/637104422024553695_qztl_8905960.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="flbzxl5" 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>蘇州玻璃鋼天線</p><p><span>***更新：</span>2020-06-21 17:19:48</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="53xv3dr" 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: </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] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="nthfdbh" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="5pntzx3" class="box"><p><p style="text-indent:25px">車載天線**理想的安裝位置就是車頂?shù)恼?*，天線利用磁性吸盤吸附在車頂上，雖然它與金屬材質(zhì)的車頂通常是絕緣的，但是兩者之間存在不小的電容，在高頻狀態(tài)下形成通路，車頂就被當(dāng)作天饋系統(tǒng)的地網(wǎng)，和天線共同構(gòu)成車載電臺(tái)的天線系統(tǒng)。 ? ? ? 不過實(shí)際生活中，受各種外在條件的限制，譬如天線較長(zhǎng)影響進(jìn)入車庫(kù)，另外為防止磨刮車漆、顛簸脫落，或者使用高增益的較大，蘇州玻璃鋼天線、較重的天線時(shí)，車載天線往往并沒有安裝在此位置，而是利用不銹卡鋼座安裝在汽車的行李架、備胎架、前后護(hù)杠、側(cè)面邊框、后備箱蓋甚至排氣管上，更有甚者直接放入車內(nèi)。改變車載天線的位置，實(shí)際上改變的是天線系統(tǒng)的地網(wǎng)，駐波比自然也會(huì)跟著改變。除了車頂正**，在其他位置天線還能調(diào)整到理想的工作狀態(tài)嗎？回答是肯定的，只要安裝時(shí)使用駐波比功率表（即SWR表），或直接使用天線測(cè)試儀，邊測(cè)量邊調(diào)整選擇的位置，蘇州玻璃鋼天線，保證天線駐波比小于1，蘇州玻璃鋼天線.5，就完全可以放在車頂以外的其他任意地方。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="蘇州玻璃鋼天線" src="http://tyunfile.71360.com/UpLoadFile/2019/11/27/9/637104422024553695_qztl_8905960.jpg"></div><p> 車載天線是指設(shè)計(jì)安裝在車輛上的移動(dòng)通訊天線，常見的就是吸盤天線。由于吸盤天線安裝擺放容易，所以在一些簡(jiǎn)易設(shè)臺(tái)場(chǎng)合常常用吸盤天線代替基地臺(tái)天線。選購(gòu)車載天線。車載天線結(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，理論上它們的效率依次增加，同樣工作頻段的天線的長(zhǎng)度也依次增加。由于車輛本身有限高，加上過長(zhǎng)的天線在車輛高速行進(jìn)時(shí)形成的風(fēng)阻，過橋洞、進(jìn)入地下車庫(kù)都是問題，所以車載天線并不是越長(zhǎng)越好，一般要求轎車天線不超過70厘米，面包車類要求天線更短?？s短型天線體積小巧，雖然增益不高，但適合使用于需要隱蔽天線的場(chǎng)合。一般的警用車輛建議安裝高增天線，尤其是在活動(dòng)區(qū)域范圍比較大的車輛，350MHZ高增益天線多分為八分之五波長(zhǎng)加感的形式，在距天線頂部二分之一波長(zhǎng)距離處有一個(gè)加感線圈。400MHZ頻段雙二分之一波長(zhǎng)天線具有較高的增益，它的外觀特征是天線的振子上有兩個(gè)加感線圈。八分之五波長(zhǎng)天線和中部加感型天線也有較高的增益，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)天線使用的場(chǎng)合可以考慮選用增益高的吸盤天線，天線的長(zhǎng)度不必有過多限制。由于吸盤天線是根據(jù)汽車使用環(huán)境而設(shè)計(jì)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="蘇州玻璃鋼天線" src="http://tyunfile.71360.com/UpLoadFile/2019/11/27/9/637104422023928519_qztl_1900394.jpg"></div><p>為了比較天線接納信號(hào)的才能好壞。把無方向性的半波振子天線(其方向?yàn)閮蓚€(gè)圓）的靈敏度定為0db，相比之下，靈敏度高方向性好的4G天線就出現(xiàn)了增益。抱負(fù)的全向4G天線的增益定義為1. 實(shí)際上所謂抱負(fù)的全向天線在實(shí)際國(guó)際是不存在的，可是在此抱負(fù)的條件下,能夠很簡(jiǎn)單核算出在空間的微波功率散布狀況。與發(fā)射功率一樣的一個(gè)實(shí)際的天線的比較大輻射指向方位測(cè)得的功率相比，就能夠得出天線的增益. 趁便說一下，前面先生說半波振子是全向天線，增益為1 的說法不必定穩(wěn)當(dāng)，它在H面上是全向的，但在E面上，主瓣半功率寬度為90度，天線增益大于1。4G天線的增益和有源電路的增益是有根本差異的。4G天線增益的丈量測(cè)驗(yàn)設(shè)備為信號(hào)源，頻譜儀或別的信號(hào)接納設(shè)備和點(diǎn)源輻射器。1．先用抱負(fù)（當(dāng)然是近似抱負(fù)）點(diǎn)源輻射天線，參加一功率；然后再距離天線必定的方位上，用頻譜儀或接納設(shè)備測(cè)驗(yàn)接納功率。測(cè)得的接納功率為P12．換用被測(cè)天線，參加一樣的功率，在相同的方位上重復(fù)上述測(cè)驗(yàn)，測(cè)得接納功率為P2;3．核算增益：G=10Lg(P2/P1)就這樣，得到了天線的增益。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/340359.html</p></div></div></div></div></div><div id="bp5b3zf" class="page-right twoColRt"><div id="xlbr33r" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="njhnjz7" 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