Discussion
What is a slot loaded patch used for?
Answer: D
Cutting a U shaped or straight slot in the patch lengthens the current path for one mode and so introduces a second, lower resonance that can be placed at a wanted band. It is widely used in handset antennas covering several cellular bands. Gain follows the aperture, cross polar performance depends on the feed and symmetry, and surface waves live in the substrate rather than in the patch metal. Perturbing a resonator to add a mode is a compact alternative to adding a second resonator.
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