Gemalto M2M GmbH EHS6-A 사용자 설명서
Cinterion
®
EHS6-A Hardware Interface Overview
Page 21 of 41
EHS6-A_HIO_v02.770
2014-08-13
Confidential / Preliminary
2.2 RF Antenna Interface
22
2.2.1
Antenna Installation
The antenna is connected by soldering the antenna pad (ANT_GSM, i.e., pad #59) and its
neighboring ground pads (GND, i.e., pads #58 and #60) directly to the application’s PCB. The
antenna pad is the antenna reference point (ARP) for EHS6-A. All RFd ata specified
throughout this document is related to the ARP.
antenna pad is the antenna reference point (ARP) for EHS6-A. All RFd ata specified
throughout this document is related to the ARP.
The distance between the antenna ANT_GSM pad (#59) and its neighboring GND pads (#58,
#60) has been optimized for best possible impedance. On the application PCB, special
attention should be paid to these 3 pads, in order to prevent mismatch.
attention should be paid to these 3 pads, in order to prevent mismatch.
The wiring of the antenna connection line, starting from the antenna pad to the application
antenna should result in a 50
line impedance. Line width and distance to the GND plane
needs to be optimized with regard to the PCB’s layer stack.
To prevent receiver desensitization due to interferences generated by fast transients like high
speed clocks on the application PCB, it is recommended to realize the antenna connection
line using embedded Stripline rather than Micro-Stripline technology.
line using embedded Stripline rather than Micro-Stripline technology.
For type approval purposes, the use of a 50
coaxial antenna connector (U.FL-R-SMT) might
be necessary. In this case the U.FL-R-SMT connector should be placed as close as possible
to EHS6-A‘s antenna pad.
to EHS6-A‘s antenna pad.