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OnBoard 868/915/868+2400 MHz - Antenna

PRO-OB-471

34.00 x 11.53 x 4.93 mm

RoHS/RoHS II Compliant

MSL Level = 1

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Evaluation Board Outline & Matching Circuit (“SMD 868” or “SMD 915”)

The evaluation board is developed to simplify antenna (PRO-OB-471) testing and evaluation. It has an arbitrary size

of 120 x 50 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. For this antenna the evaluation board is available with three different tuning options, two of which is:

1.

Evaluation board “SMD 868” (PRO-EB-472) for 860-870 MHz operation

2.

Evaluation board “SMD 915” (PRO-EB-476) for 902-928 MHz operation.

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.

M

atching circuit

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

is tuned for optimum balance for 868 MHz or 915 MHz using the following (can be replaced by equivalent):

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

this matching may be changed with other values/components/brands for compensation of such effects. This is further

described in General Implementation Guidelines section below.

Component

“SMD 868” (PRO-EB-472)

“SMD 915” (PRO-EB-476)

C4

N/A

N/A

C5

5.6 pF (Murata GJM1555C1H5R6WB01)

1.5 nH (Murata LQW15AN1N5B00)

C6

2.2 pF (Murata GJM1555C1H2R2WB01)

5.6 pF (Murata GJM1555C1H5R6WB01)

C6

C4

C5

Antenna feed

Transmission line

C6

C5

C4