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How can the bandwidth of a patch antenna be increased?

  • A.By using a thicker substrate of lower permittivity
  • B.By using a thinner substrate of higher permittivity to confine the field
  • C.By making the patch physically longer than its resonant length
  • D.By increasing the size of the ground plane beneath the substrate

Answer: A

A thicker, lower permittivity substrate lets more field fringe into the air, which raises the radiated energy relative to the stored energy and so lowers the quality factor. The costs are a larger antenna, greater surface wave excitation and a probe feed inductance that must be compensated. Thin high permittivity substrates do the opposite, patch length sets the frequency, and ground plane size affects the back radiation rather than the bandwidth.

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