What can an impedance mismatch in the RF cables and connectors cause?

Question

Options

• AIncreased range of the RF signal
• BFewer MCS values in the MCS table
• CIncreased amplitude of the RF signal
• DExcessive VSWR

• A
  2% (1)
• B
  2% (1)
• C
  7% (3)
• D
  88% (38)

Explanation

VSWR stands for Voltage Standing Wave Ratio, which is a measure of how well the impedance of the RF cable and connectors matches the impedance of the transmitter and the antenna. Impedance is the opposition to the flow of alternating current in an RF circuit, and it depends on the frequency, resistance, capacitance, and inductance of the components. A perfect impedance match would have a VSWR of 1:1, meaning that all the power is transferred from the transmitter to the antenna, and none is reflected back. However, in reality, there is always some degree of mismatch, which causes some power to be reflected back to the transmitter, creating standing waves along the cable. This reduces the efficiency and performance of the wireless system, and can also damage the transmitter. Excessive VSWR can be caused by using poor quality or damaged cables and connectors, or by using components that have different impedance ratings.

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