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I'm struggling with a basic antenna design around a 868 MHz patch antenna. The datasheet of the vendor is particularly sparse in regards of layout guidelines.

A rough preliminary sketch of the layout already raises a lot of questions:

preliminary layout sketch

Strategy here is to connect the antenna feedline directly to a balun with a 50 ohms stripwire. The balun and CPU aka RF receiver chip are enclosed in a shielding box.

A first question is, can I leave the top plane with this stripwire with a via and pass A) the shield ground like depicted in the image? and B) Can this stripwire be surrounded with the ground plane that is needed to complete the antenna?

Second, is the orientation of the stripwire connection to the feedline of importance?

To guarantee proper matching I figure I should have to connect the stripwire in the direction of the resonance, in the x axis, given an orientation like the image below:

enter image description here

patch antenna used is APAE868R2540JBDB2 (datasheet) from Abracon

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  • \$\begingroup\$ You really need to link to the datasheet. Your answers should be in it. Maybe they are in it, but implicit in the way things are drawn or described rather than explicitly written out. \$\endgroup\$ – JRE Feb 13 at 12:21
  • \$\begingroup\$ In microstrip patch antenna design, if it is fed directly to patch using via connection then orientation of feed-line ( stripwire) doesn't matter but if feedline is an electromagnetically coupled line ( no direct connection with patch) then orientation matter. \$\endgroup\$ – Anil Pandey Feb 15 at 11:08
  • \$\begingroup\$ @Anil Pandey, the line should not rely on em coupling for passing the signal, so the patch is connected directly to my balun with a copper trace \$\endgroup\$ – JSierens Feb 22 at 10:25

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