Example Frequency Ranges Below we can see the span of frequencies that are commonly used in communications. Broadcast transmitters for AM, FM and Television use frequencies below 1000 MHz, Wi-Fi uses two bands at higher frequencies - 2.4 and 5GHz. Cellular phones use many different frequencies.
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Technology or device | Type of wireless signal |
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Transmitter | Receiver | Transceiver |
Examples: | Examples: | Examples: |
Sector Antenna | Focused Antenna |
Sector antennas send out a pie-shaped wedge of signal - it can be anywhere between 30 degrees and 120 degrees wide. These are often long, rectangular antennas that are separate or integrated in to a router. | A focused antenna sends out a narrow beam of signal - it is normally around 5 to 10 degrees wide, but it can be a little wider as well. These are often dishes or have a mesh bowl reflecting signal behind them. |
Antenna Type | Best Uses |
Omnidirectional Sector Focused | ______________________________ ______________________________ ______________________________ ______________________________ ______________________________ ______________________________ |