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Near-field antenna array with signal processing

  • US 7,176,828 B2
  • Filed: 02/04/2005
  • Issued: 02/13/2007
  • Est. Priority Date: 08/07/2002
  • Status: Expired due to Fees
First Claim
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1. An electromagnetic antenna assembly for detecting moving insects in a region comprising:

  • an array of receiving elements that receive signals transmitted into a field of the array in the region at least at one frequency;

    mixer means that combines the received signals with a reference signal to extract in-phase (I) and quadrature (Q) IF signals from the received signals, wherein the I and Q signals are combined to form complex signal vectors;

    adjusting means that adjust phase and magnitude values of each of said complex signal vectors in real time to create a beamfront that is deliberately distorted such that the beamfront has a plurality of maxima and minima values;

    summing means that sum the adjusted complex signal vectors; and

    processing means that spatially and temporally filter said summed complex signal vectors to detect changes in the field over time corresponding to at least one path of said insects moving in said region.

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