Which of the following descriptions of the function of the coupler is wrong? (Multiple choice)

Question

Options

• ACombine multiple input signals into one output, and then filter and separate the mixed signal in
• BDivide one signal into multiple outputs
• CTake the required signal energy from the trunk line to the near-end antenna, and allocate more
• DConnect the AP's radio port to the antenna port

• A
  81% (55)
• C
  19% (13)

Explanation

Options A, B, and D are all incorrect descriptions of a coupler's function because they describe other devices entirely. Option A describes the behavior of a combiner/multiplexer, which merges signals and then separates them - that is not what a coupler does. Option B describes a splitter or power divider, which evenly divides one signal into multiple equal outputs, whereas a coupler asymmetrically taps only a small portion of signal energy from the main line. Option D describes a simple RF cable or pigtail connector that links an AP radio port to an antenna - a purely passive connection with no signal sampling capability.

Option C is the only correct description: a coupler (specifically a directional coupler in a Distributed Antenna System) taps a small, controlled amount of signal energy from the trunk line to feed a nearby antenna, while passing the bulk of the remaining signal power forward to serve more distant antennas.

Memory tip: Think of a coupler like a tap on a water main - it draws off a small stream for local use while keeping the main flow going strong downstream. If a question describes combining, splitting equally, or just connecting ports, those are other devices, not a coupler.

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