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RF question for multiple transceivers on one antenna

Discussion in 'Radio and Wireless' started by pgib8, Aug 8, 2016.

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  1. pgib8


    Jul 26, 2015

    I'm thinking about how one would integrate 3 transceivers on a single antenna, in such a way that in TX mode only one transceiver will ever transmit, and in RX mode, all 3 transceivers will be listening on 3 independent frequencies at the same time.

    Attached is the concept I'm thinking of, the frequency is about 900MHz.

    There are two key components that I'm thinking.
    A: TX/RX switches isolate the 2 other receivers during TX so that the TX power doesn't get to them.
    B: Power dividers ensure during RX that receivers get a fair share of RX signal, ensuring one of the receivers doesn't suck up most of the signal.

    The LNA should compensate for losses, especially for splitting the RX signal.

    Right away my first question is if I should add a 3rd power divider. As it stands in my concept drawing, one transceiver gets 50% signal, while the other two get 25% each. If I add a 3rd power divider, I can provide each transceiver with equal 25%, and the one remaining output port, I could just solder a 50 Ohm resistor to it.
    I'm not sure which has more advantage. Perhaps doing the equal 25% has the advantage that I can crank up the LNA a little higher.

    Attached Files:

  2. Sunnysky


    Jul 15, 2016
    ensure Tx is disabled before switch to Rx
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