User Manual
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.2 RF Antenna Interface
- 2.3 Sample Application
- 3 Operating Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
Cinterion
®
ELS31-V/ELS51-V Hardware Interface Overview
2.2 RF Antenna Interface
17
ELS31-V_ELS51-V_HIO_v00.502 2015-12-07
Confidential / Preliminary
Page 14 of 35
2.2 RF Antenna Interface
The RF interface has an impedance of 50. ELS31-V /ELS51-V is capable of sustaining a total
mismatch at the antenna line without any damage, even when transmitting at maximum RF
power.
The external antenna must be matched properly to achieve best performance regarding radi-
ated power, modulation accuracy and harmonic suppression. Antenna matching networks are
not included on the ELS31-V / ELS51-V module and should be placed in the host application if
the antenna does not have an impedance of 50
.
Regarding the return loss ELS31-V / ELS51-V provides the following values in the active band:
Table 3: 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