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What is a stacked patch antenna?

  • A.A patch with a second ground plane above it to shape the radiation pattern
  • B.A parasitic patch mounted above the driven one on a second layer
  • C.Several patches printed side by side and fed from a common line
  • D.A patch printed on both sides of the same substrate for dual polarisation

Answer: B

Stacking places a second resonant patch above the fed one, and the two coupled resonances give a much wider impedance bandwidth or a second operating band. Bandwidths of fifteen to twenty per cent are achievable against two or three for a single patch. Side by side patches form an array, printing on both sides describes a different structure, and a second ground plane above would short the radiation out. Coupling two resonators to broaden a response is a standard filter technique applied here to an antenna.

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