User's Manual
Table Of Contents
- Contents
- Figures
- Tables
- Document History
- Introduction
- Product concept
- Application Interface
- Antenna interface
- Electrical, reliability and radio characteristics
- Mechanics
- Reference Approval
- List of parts and accessories
MC46 Hardware Interface Description
DRAFT
MC46_HD_V02.8xb Page 63 of 98 21.08.2003
4 Antenna interface
The RF interface has an impedance of 50". MC46 is capable of sustaining a total mismatch
at the antenna connector or pad without any damage, even when transmitting at maximum
RF power.
The external antenna must be matched properly to achieve best performance regarding
radiated power, DC-power consumption and harmonic suppression. Matching networks are
not included on the MC46 PCB and should be placed in the host application.
Regarding the return loss MC46 provides the following values:
Table 21: Return loss
State of module Return loss of module Recommended return loss of application
Receive > 8dB > 12dB
Transmit not applicable > 12dB
Idle < 5dB not applicable
The connection of the antenna or other equipment must be decoupled from DC voltage.
4.1 Antenna installation
To suit the physical design of individual applications MC46 offers two alternative approaches
to connecting the antenna:
· Recommended approach: U.FL-R-SMT antenna connector from Hirose assembled on
the component side of the PCB (top view on MC46). See Chapter 4.1.2 for details.
· Antenna pad and grounding plane placed on the bottom side. See Chapter 4.1.1.
Figure 27: U.FL-R-SMT connector Figure 28: Antenna pad and GND pad