A Near-Field Setup with Independent Amplitude and Phase Control of the Stimuli for Phased Antenna Testing

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1 Citation (Scopus)


This contribution discusses a near-field antenna setup capable of delivering multiple input signals with controllable (i.e., user defined) amplitude and phase relations to an antenna under test, operating in the X-band. The setup is based on a Cartesian modulation (phase and quadrature signals) of phase coherent signals, achieved employing broadband passive IQ-mixers controlled via high-resolution digital-to-analogue converters (DACs). A dedicated calibration procedure allows achieving independent phase and amplitude control on the different signal paths to compensate for loss and delay mismatches among the different channels. The capability to align the relative phases of the various paths with respect to one enables the direct testing of phased antenna arrays. The system calibration is elaborately described. The proposed Cartesian modulation is demonstrated by studying a complex antenna array, with a subset of its elements being controlled independently and phase delayed for actively controlling the far-field radiation pattern.
Original languageEnglish
Title of host publication11th European Conference on Antennas and Propagation, EuCap 2017
Place of PublicationPiscataway, NJ
Number of pages5
ISBN (Electronic)978-8-8907-0187-0
ISBN (Print)978-1-5090-3742-1
Publication statusPublished - 2017
EventEuCAP 2017: 11th European Conference on Antennas and Propagation - Paris, France
Duration: 19 Mar 201724 Mar 2017


ConferenceEuCAP 2017
Abbreviated titleEUCAP 2017


  • antenna phased arrays
  • antenna testing
  • digital-analogue conversion
  • mixers (circuits)
  • phase control
  • Cartesian modulation
  • broadband passive IQ-mixers
  • complex antenna array
  • delay mismatch compensation
  • far-field radiation pattern
  • high-resolution DAC
  • high-resolution digital-to-analogue converters
  • independent amplitude control
  • loss compensation
  • near-field antenna setup
  • phase coherent signals
  • phased antenna array testing
  • quadrature signal
  • Antenna arrays
  • Antenna measurements
  • Antenna radiation patterns
  • Calibration
  • Europe
  • Testing


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