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I am trying to design a gps data logger. I am not able to comprehend the chip antenna layout given here.

enter image description here

The pads 1 & 2 in the layout share the same terminal? Isn't it same as connecting the feed line to GND?

Thanks

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  • \$\begingroup\$ @Neil_UK: Follow the provided link to see the full datasheet. That's why it's there. \$\endgroup\$
    – Dave Tweed
    Jul 10, 2016 at 11:18

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You are correct that Pads 1 & 2 in the diagram share the same terminal, however this is not the same as connecting DC ground on both ends of the antenna. This is how the magnetic field is coupled into the antenna. The electric field travelling in the substrate is referenced to both the ground vias which is a coplanar waveguide mode of propagation. This RF short circuit forces a magnetic field to exist at the antenna pad and excites the resonant mode in the dielectric resonator antenna.

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    \$\begingroup\$ @R.Hirur Yes, in RF/antenna design it's usually better to think about the field mode forced by a termination. That is, open circuit forces electric field maximum, short circuit forces magnetic field (current density) maximum, instead of what would happen with idealized circuit components. \$\endgroup\$ Jul 10, 2016 at 13:30

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