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network-programmingsignalswireless

Signal Level at the Input of Antenna

I am taking a Wireless Networks course and I have a midterm next week. While I am studying to this lesson I got stuck in one question which I dont have any clue for.

The question is the following ;

A transmitter generates a 15 dBm signal and is connected to an antenna using a cable that induces a 3dB loss.The cable has two connectors that induce a loss of 2 dB each. What is the signal level at the input of the antenna?

In my notes, I don't have any formulas or clue about how I'm gonna solve this one.

Could anyone help me about it please?

Thanks by advance.

Solution

  • I'm taking the same course, below you can see the answer

    1. Signal loss for 2 connectors = 2 * 2dBm = +4dBm
    2. Signal loss for the cable = +3dBm
    3. Total Loss = 4dBm + 3dBm = +7dBm Therefore, signal level at the input of the antenna = +15dBm - 7dBm = +8dBm