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What causes high return loss in an RF transmission system?

Given: Return Loss is the decrease of forward energy in a system when some of the power is
being reflected back toward the transmitter.
What causes high return loss in an RF transmission system?

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A.
A Voltage Standing Wave Ratio (VSWR) of 1:1

B.
An impedance mismatch between devices in the RF system

C.
Cross-polarization of the RF signal as it passes through the RF system

D.
The use of different connector types in the RF system (e.g. N-type and SMA-type)

E.
Low output power at the transmitter and use of a high-gain antenna

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