Selection of ceramic GSM chip antenna
I. Size of GSM ceramic chip antenna
The size of the ceramic GSM chip antenna is 21 x 7 x 3 mm only. The distance for the selected ceramic chip antenna to the ground plane has to be to be 7 mm. There is a need for a gap of 2mm between the antenna and the plastic enclosure as well.
18.3 mm – 2 mm for the distance to the plastic enclosure – 3 mm for the antenna – 7 mm means, that there is still 7.3 mm left. The 7.3 mm can be used to design some more ground area to place some components for the matching circuit.
II. Ceramic GSM chip antenna with distance to the enclosure
The ceramic GSM chip antenna with is distance to the plastic enclosure will need 5 mm only.
III. Free space for GSM ceramic chip antenna
A part of the free space can be use to place some capacitors or inductors for the matching circuit. Worst case we will have a need for three parts (Pi-circuit).
Analyse of GSM ceramic chip antenna summary
The recommended antenna could fit on the free space left. Please take care, that the screws left and right of the antenna will me made with plastic.
If you still not sure which antenna to select and why, then do not hesitate to drop an email to harald.naumann (at) gsm-modem.de