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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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Evaluation Board Outline & Matching Circuit

The evaluation board (PRO-EB-609) is developed to simplify antenna testing and evaluation. It has an arbitrary size

of 48 x 18 mm and includes an SMA connector. The purpose is to give a reference design for an optimal antenna

implementation. The evaluation board can also be used to test other implementations by cutting and soldering the PCB

into any device.

Evaluation board outline

The evaluation board has a matching circuit implemented next to the antenna. This is aimed to enable optimization

possibilities for the user. The component positions are sized for 0402 (1005 metric) SMD components.

Matching circuit

The antenna needs a matching circuit to adjust the resonant frequency balance. When delivered, the evaluation board

is tuned for optimum balance at the 2.4 GHz band. The component values for this setup are:

C1 = 0.4 pF

C2 = 0.6 pF

C3 = 1.1 pF

However, it is common that the resonant frequency will shift during implementation in an arbitrary device. Therefore,

this matching may be changed for compensation of such effects. This is further described in General Implementation

Guidelines section below.

C3

C1

C2

Antenna feed

Transmission line

C1

C2

C3