My board is 35 mm x 20 mm with RF communications aimed at around 920Mhz (915-930 acceptable) and I intend to have the antenna output run to some kind of fixed antenna on the PCB. The signal will travel through a 0402 component which can be moved to divert to a uFL connector to allow for the use of an external antenna if needed.
I'm having a lot of trouble finding an antenna that does not drop abysmally in effectiveness when paired with my PCB dimensions.
Every design for either chip or PCB antennas I have found require a large (relatively) ground area in the non-antenna segments of the board which is several times larger than my entire board.
Documentation about the effect of the ground size:
Antenova (Chip).
Linx (Chip) Abracon (Chip vs. Trace)PCB trace antennas also specify ground dimensions for reference designs so I'm assuming that they have the same issue.
The best PCB trace antenna I've found (size-wise) is from
TI's DN024, which fits vertically but will require matching (especially as my board is likely to be different thickness than the 0.8 they tested with)
Here is the TI PCB trace antenna next to my (unfinished) board.
Is there any design or method that can avoid dropping from 60% to 10% efficiency without significantly increasing the board size to increase ground area?
This is my first RF design (and first PCB) and I do not have the ability to run simulations, so any help would be appreciated.