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Calibration apparatus for smart antenna and method thereof

  • US 20060019712A1
  • Filed: 09/19/2005
  • Published: 01/26/2006
  • Est. Priority Date: 11/14/2001
  • Status: Abandoned Application
First Claim
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1. A calibration apparatus of an adaptive array antenna system, the calibration apparatus comprising:

  • calibrator means that generates the “

    Rx calibration signal” and

    performs the calibration procedure based on the “

    Rx calibration signal”

    received at each of receiving antenna elements of the array antenna means;

    additional antenna means that transmits the “

    Rx calibration signal”

    to the receiving antenna elements of the array antenna means with an arbitrary arrangement and spacing in a freuqency band of receiving RF (radio frequency); and

    array antenna means with an arbitrary arrangement and spacing of antenna elements that transfers the “

    Rx calibration signal”

    , which have been received from the additional antenna means, to the calibrator means, wherein the calibration procedure is performed by a step of compensating the differences or irregularities in phase characteristics at each of signal paths associated with each of the receiving antenna elements of the array antenna means utilizing φ

    RX, n (phase delay between each of receiving antenna elements of the array antenna means and each corresponding port of the calibrator means) that is related with the two sets of phase delay values φ



    RX, n (phase delay between the additional antenna means and the calibrator means) and φ



    RX, n (phase delay between the additional antenna means and each of the receiving antenna elements of the antenna array means) by a mathematical equation
    φ

    RX, n



    RX, n

    φ



    RX, n where φ



    RX, n is obtained in advance of the calibration procedure.

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