Focused Connected Array Antenna as a Broadband Beam-Steering Feed for Quasi-Optical Systems

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This paper proposes a broadband and efficient integrated focal plane array solution based on a near-field focused connected array of slots. The focused aperture provides (1) broadband and highly efficient illumination of the quasioptical system, and (2) scanning capabilities within a focusing system. The connected array antenna in turn allows for a fully integrated solution that can synthesize a focused aperture while providing broadband impedance matching. Focused connected array antennas enable the coupling to a reflector system over bandwidths in excess of one octave and with aperture efficiencies in excess of 60%. To demonstrate the concept we present two printed circuit board (PCB) prototypes operating in the band 3-6 GHz and yielding more than 60% reflector aperture efficiency under broadside illumination and allowing to scan one beamwidth at the lowest frequency with a frequency-averaged scan loss of 0.2 dB. The feasibility of scaling this concept to THz frequencies and with dynamic beam-steering capabilities is discussed in the context of a superconducting device.

Original languageEnglish
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Publication statusE-pub ahead of print - 2022


  • Aperture antennas
  • aperture efficiency
  • Apertures
  • Broadband antennas
  • broadband array
  • Broadband communication
  • connected array
  • focused aperture
  • Focusing
  • Lenses
  • near-field
  • Reflector antennas
  • scanning


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