我們在給(gei)客戶介紹(shao)產品(pin)時，都(dou)(dou)會(hui)提到天(tian)(tian)線(xian)二字。接觸(chu)過無(wu)線(xian)網(wang)橋的(de)朋友都(dou)(dou)會(hui)知道(dao)，無(wu)線(xian)網(wang)橋都(dou)(dou)是(shi)有天(tian)(tian)線(xian) ，只是(shi)分為(wei)內(nei)(nei)(nei)置(zhi)天(tian)(tian)線(xian)和外(wai)置(zhi)天(tian)(tian)線(xian)。內(nei)(nei)(nei)置(zhi)的(de)由于(yu)看不(bu)到，常常誤以為(wei)沒有天(tian)(tian)線(xian)。很(hen)多客戶會(hui)問是(shi)帶天(tian)(tian)線(xian)的(de)好還(huan)是(shi)不(bu)帶天(tian)(tian)線(xian)的(de)好，今天(tian)(tian)，小編在這(zhe)里正式回復下，無(wu)論哪一種無(wu)線(xian)網(wang)橋，都(dou)(dou)是(shi)有天(tian)(tian)線(xian)的(de)，只是(shi)內(nei)(nei)(nei)置(zhi)和外(wai)置(zhi)的(de)區(qu)別。

　　無線(xian)(xian)(xian)(xian)網橋(qiao)信(xin)(xin)號(hao)發射(she)(she)原(yuan)理：發射(she)(she)端網橋(qiao)輸(shu)(shu)(shu)出(chu)的射(she)(she)頻(pin)信(xin)(xin)號(hao)功率通過饋線(xian)(xian)(xian)(xian)(電(dian)纜)輸(shu)(shu)(shu)送(song)到天(tian)(tian)線(xian)(xian)(xian)(xian)，再由(you)天(tian)(tian)線(xian)(xian)(xian)(xian)以電(dian)磁波形式輻射(she)(she)出(chu)去(qu)，當電(dian)磁波到達接收地點后，由(you)天(tian)(tian)線(xian)(xian)(xian)(xian)接收下來，并(bing)通過饋線(xian)(xian)(xian)(xian)送(song)到接收端網橋(qiao)。可知(zhi)天(tian)(tian)線(xian)(xian)(xian)(xian)是(shi)無線(xian)(xian)(xian)(xian)網橋(qiao)信(xin)(xin)號(hao)的發射(she)(she)設備，沒有天(tian)(tian)線(xian)(xian)(xian)(xian)，無線(xian)(xian)(xian)(xian)網橋(qiao)的信(xin)(xin)號(hao)沒法發射(she)(she)出(chu)去(qu)，也(ye)就(jiu)沒有無線(xian)(xian)(xian)(xian)電(dian)通信(xin)(xin)。也(ye)就(jiu)是(shi)說，我(wo)們常說的無線(xian)(xian)(xian)(xian)網橋(qiao)傳輸(shu)(shu)(shu)實際是(shi)通過天(tian)(tian)線(xian)(xian)(xian)(xian)傳輸(shu)(shu)(shu)的。

　　而且天(tian)(tian)(tian)(tian)線(xian)的(de)分類很多，根(gen)據(ju)不(bu)(bu)同(tong)(tong)(tong)(tong)頻率網橋，不(bu)(bu)同(tong)(tong)(tong)(tong)距離(li)，不(bu)(bu)同(tong)(tong)(tong)(tong)環境，不(bu)(bu)同(tong)(tong)(tong)(tong)場合使(shi)用不(bu)(bu)同(tong)(tong)(tong)(tong)的(de)天(tian)(tian)(tian)(tian)線(xian)。按安裝方式(shi)不(bu)(bu)同(tong)(tong)(tong)(tong)，有(you)內置天(tian)(tian)(tian)(tian)線(xian)和外(wai)置天(tian)(tian)(tian)(tian)線(xian)；按方向(xiang)的(de)區分，有(you)定向(xiang)天(tian)(tian)(tian)(tian)線(xian)和全(quan)向(xiang)天(tian)(tian)(tian)(tian)線(xian)；按頻率區分有(you)2.4G天(tian)(tian)(tian)(tian)線(xian)和5.8G天(tian)(tian)(tian)(tian)線(xian)；按外(wai)形區分有(you)八木天(tian)(tian)(tian)(tian)線(xian)，平板天(tian)(tian)(tian)(tian)線(xian)，鍋狀天(tian)(tian)(tian)(tian)線(xian)……如此多的(de)天(tian)(tian)(tian)(tian)線(xian)，選(xuan)擇會不(bu)(bu)會很困難？

　　一、內置天(tian)線和外置天(tian)線

　　1，內置天線

　　內(nei)置(zhi)天(tian)線(xian)是指天(tian)線(xian)一體化無(wu)線(xian)網橋，體積小(xiao)，安裝方便，一般用(yong)于(yu)近距離無(wu)線(xian)傳輸系統中，一般10公里(li)內(nei)都(dou)可以使(shi)用(yong)內(nei)置(zhi)天(tian)線(xian)。

　　2，外置天線

　　外置(zhi)天(tian)線(xian)一般較大(da)，如果傳(chuan)輸的距(ju)離比較遠(yuan)，比如10公(gong)里以上(shang)，就建議采(cai)用(yong)高增益外置(zhi)天(tian)線(xian)。外置(zhi)天(tian)線(xian)的遠(yuan)距(ju)離傳(chuan)輸一般是點(dian)(dian)對點(dian)(dian)傳(chuan)輸。因為傳(chuan)輸距(ju)離遠(yuan)，角度(du)會(hui)相對比較小(xiao)。全向(xiang)天(tian)線(xian)除外。

　　二、定向天線(xian)和全(quan)向天線(xian)

　　1，定向天線

　　在水平方向圖(tu)上表現為一(yi)定角度范圍輻射(she)(she)，主要輻射(she)(she)范圍象個倒立的(de)不太完整的(de)圓錐(zhui)，一(yi)般應(ying)用于傳輸距離遠、覆蓋(gai)范圍小、目(mu)標密度大(da)、頻率利(li)用率高的(de)環境(jing)。定向天線的(de)信號只(zhi)能向前面傳遞。采(cai)用定向發(fa)射(she)(she)天線的(de)目(mu)的(de)，是增加(jia)輻射(she)(she)功(gong)率的(de)有效利(li)用率，增加(jia)保密性，增加(jia)抗干擾能力。

　　2，全向天線

　　即在(zai)水平方(fang)向(xiang)圖(tu)上表現為360°都均(jun)勻(yun)輻射(she)，輻射(she)范(fan)(fan)圍(wei)比較(jiao)象一個蘋果(guo)，具有無(wu)無(wu)方(fang)向(xiang)性(xing)，一般應用在(zai)傳輸距離近、覆蓋范(fan)(fan)圍(wei)大的(de)環(huan)境中。全向(xiang)天線(xian)的(de)信號向(xiang)四(si)面八方(fang)發射(she)，價(jia)格(ge)便宜，增(zeng)益比較(jiao)小，一般在(zai)12dBi以下。

　　三，2.4G天(tian)線和5.8G天(tian)線

　　頻(pin)率的(de)(de)(de)選(xuan)(xuan)擇非(fei)常簡單(dan)，就是(shi)(shi)無線(xian)(xian)網(wang)(wang)(wang)橋(qiao)的(de)(de)(de)頻(pin)率是(shi)(shi)多(duo)少是(shi)(shi)來選(xuan)(xuan)擇相應(ying)的(de)(de)(de)天(tian)線(xian)(xian)。如果(guo)無線(xian)(xian)網(wang)(wang)(wang)橋(qiao)是(shi)(shi)2.4G的(de)(de)(de)，就選(xuan)(xuan)擇2.4G的(de)(de)(de)天(tian)線(xian)(xian)；無線(xian)(xian)網(wang)(wang)(wang)橋(qiao)是(shi)(shi)5.8G的(de)(de)(de)，就選(xuan)(xuan)擇5.8G的(de)(de)(de)天(tian)線(xian)(xian)。千萬(wan)不用(yong)將2.4G的(de)(de)(de)天(tian)線(xian)(xian)用(yong)在5.8G的(de)(de)(de)網(wang)(wang)(wang)橋(qiao)或(huo)者(zhe)5.8G的(de)(de)(de)天(tian)線(xian)(xian)用(yong)在2.4G的(de)(de)(de)網(wang)(wang)(wang)橋(qiao)中，會導致無法傳輸信號。

　　看著文字覺得天線有些復雜。其實很簡單的(de)。只要把你的(de)具體情況跟萊安(an)工作人員說清楚(chu)，我們會幫你配置好。完(wan)全不(bu)用自己去思考選擇。