Integration Manual
Table Of Contents
- Contents
- Tables
- Figures
- 0. Document History
- 1. Introduction
- 2. Product Concept
- 3. Application Interface
- 4. Antenna Interface
- 5. Electrical, Reliability and Radio Characteristics
- 6. Mechanics
- 7. Board-to-Board Application Connector
- 8. Reference Approval
HMS1 Hardware Interface Description
Confidential / Preliminary
s
HMS1_HD_V01.62 Page 23 of 39 2006-08-21
4. Antenna Interface
The RF interface has an impedance of 50Ω. HMS1 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, modulation accuracy and harmonic suppression.
Antenna matching networks are not included on the HMS1 PCB and should be placed in the
host application.
The connection of the antenna or other equipment must be decoupled from DC voltage. This
is necessary because the antenna connector is DC coupled to ground via an inductor for
ESD protection.
4.1. Antenna Installation
To suit application requirements the HMS1 module adapts an internal antenna from Skycross
that is connected to the two antenna pads:
Figure 4: Internal antenna for HMS
4.1.1. Test Antenna
For production and type approval test the HMS1 module also provides a subminiature
coaxial switch from Hirose Ltd. The product name is:
MS-156NB
For detailed specifications and latest product information please contact your Hirose dealer
or visit the Hirose home page, for example
http://www.hirose.com.