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:
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:
patch antenna used is APAE868R2540JBDB2 (datasheet) from Abracon