描述
需要說明的是,通常所說的“全向天線”不是嚴(yán)格的說法,全向天線應(yīng)指在三維立體空間的全向,但工程界也往往把某個(gè)平面內(nèi)方向圖為圓周的天線稱為全向天線,如鞭狀天線,它在徑向的主瓣是圓,但仍有軸向的副瓣。
常見天線的增益:鞭狀天線6-9dBi,GSM基站用八木天線15-17dBi,拋物面定向天線則很容易做到24dBi。
無線電發(fā)射機(jī)輸出的射頻信號(hào),通過饋線(電纜)輸送到天線,由天線以電磁波形式輻射出去。電磁波到達(dá)接收地點(diǎn)后,由天線接收下來(僅僅接收很小很小一部分功率),并通過饋線送到無線電接收機(jī)。因此在無線網(wǎng)絡(luò)的工程中,計(jì)算發(fā)射裝置的發(fā)射功率與天線的輻射能力非常重要。
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