User's Manual

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Regarding the return loss, the Module provides the following values in the active band:

Table 6-1 Return Loss in the Active Band

State of Module

Return Loss of

Module

Recommended Return Loss of

Application

Receive ≥ 8dB ≥ 12dB

Transmit not applicable ≥ 12dB

The connection of the antenna or other equipment must be de coupled from DC voltage. This is necessary

because the antenna connector is DC coupled to ground via an inductor for ESD protection.

6.1 Antenna Installation

To suit the physical design of individual applications, the MC2261 offers two alternative approached to

connecting the antenna:

■ Recommended approach:

MM9329-2700B antenna connector manufactured by MURATA assembled on

the component side of the PCB (top view on Module). See Section 4.3 for details.

■ Antenna pad and grounding plane placed on the bottom side. See Section 4.2 for details.

The

MM9329-2700B connector has been chosen as antenna reference point (ARP) for the ZTEMT

reference equipment submitted to type approve the MG2639 Module. All RF data specified throughout this

manual are related to the ARP. For compliance with the test results of the ZTEMT type approval you are

advised to give priority to the connector, rather than using the antenna pad.

Note: Both solutions can be applied alternatively. This means,if the antenna is connected to the pad, then

the connector on the Module must be left empty,and when the antenna is connected to the Module

connector, the pad is useless,

6.2 Antenna Pad

The antenna pad of the module is soldered to the board on the customer design to connect with RF line.

For proper grounding connect the RF line to the ground plane on the bottom of the MG2639 Module which

must be connected to the ground plane of the application.

Consider that according to GSM recommendations as 50Ω connector is mandatory for type approval

measurements. It must be ensured that the RF line which is connected to antenna pad should be controlled

on 50Ω.

Notes on soldering

■ To prevent damage to the Module and to obtain long-term solder joint properties, you are advised to

maintain the standards of good engineering practice for soldering.

Material Properties

■ MG2639 Module PCB: FR4

■ Antenna pad: Gold plated pad

6.3 Antenna connector

The MG2639 Module uses a microwave coaxial connector supplied by Murata Ltd. The product name is

MM9329-2700B. The position of the antenna connector on the Module PCB can be seen in Figure 6-3.

Figure 6-3 Specification of

MM9329-2700B connector