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OnBoard 2.4 GHz Mini SMD - Antenna

PRO-OB-607

9.90 x 4.30 x 2.00 mm

RoHS/RoHS II Compliant

MSL Level = 1

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General Implementation Guidelines

The antenna can be positioned in different ways, although there are some positions which are more beneficial. Below

picture shows a typical PCB with examples on different antenna positions. The optimal position is option 1 or 4.

= GND pin(s)

The antenna should be aligned with the PCB edge if possible, preferably with the GND pin(s) close to a corner.

The antenna enables that small electrical components are mounted inside the antenna keep-out block. This is a space-

efficient solution which has very little influence on the performance. It may have an impact on the antenna tuning, but

is fully possible if there is limited space on the PCB.

Another general aspect on surface mounted antennas is regarding the PCB population. If other electrical components

are positioned in the surrounding area of the antenna, some impact on the antenna tuning and radiated performance

may be expected. It is recommended that such components are distributed below a topographical slope that starts on

PCB level at the antenna keep-out block, and slowly increases the height.

It shall also be highlighted that plastic and metal parts in the near proximity of antennas may influence the antenna

tuning and/or performance. This aspect should be noted as a general guideline for all antennas. The effects are difficult

to estimate without detailed information, but it is common that a plastic housing above the antenna shifts the resonant

frequency down. It is recommended to measure the antenna in the actual device after implementation.

Optimal

1 & 4

3

6

2 & 5

1

2

3

4

5

6