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LNB((Low Noise Block) is a component which consists of LNA（Low Noise Amplifier）and LNC (Low Noise Converter).
Usually there are two kinds Low Noise Block: LNB (Without feed plate) and LNBF (With feed plate), as shown in the following pictures:
1. Single output LNB: Generally there is only one LO output. Pol. Mode is vertical or horizontal, or only output one kind of pol. signal according to the input level.
Single output LNB
C-band Dual Feedhor
C-band LNB and Feedhorn
Single output LNBF
2. Double output LNBF: One is Single band LO double output, and the other is Dual Band LO double output.
Remarks: The two LNBF has similar appearance, but they are different in LO frequency. For C-band, the LO can only be 5150/5750MHz.
3. Four-way output LNBF: Dual band LO four-way output type, as shown in the following pictures:
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