TIWI5
ANTENNA DESIGN GUIDE
The information in this document is subject to change without notice.
330-0093-R1.3
Copyright © 2012-2016 LSR
Page 22 of 23
5.3
Module Integration Considerations – Substitute Antenna Systems
The module’s certification is only valid for the list of approved antennas presented in section
5.2. However, substitute antennas may be used in place of the approved antenna only if the
antennas are of the same type and the peak gain is less than or equal to the peak gain of the
similar approved antenna. Also the antennas should have similar in-band and out-of-band
characteristics.
5.4
Module Integration Considerations – Circuit Implementation
It is recommended that all connection PCB (printed circuit board) traces to the power supply
and digital control terminal be as short as possible. Though not necessarily required in all cases,
it is a best practice to provide an optional shunt capacitor placement at the module pin on all
active and routed power supply and digital control lines. Further, a series damping resistor
placement should be incorporated between the module pin/shunt capacitor node and the
source/sink of the digital control signals. This provides for effective bypassing and decoupling of
digital lines from the radio module, in the event that the application circuit has longer power
supply and digital routing.
5.5
Module Integration Considerations - Top Assembly
In addition to the recommendations given for the antenna systems and the module placement
onto a product PCB, it is recommended that all wiring and interconnect systems within the
product be not routed anywhere close the module and its associated circuitry on the PCB, doing
so could change the emission characteristics of the module.
5.6
Testing Requirements for End-Product
Once the module is integrated and the product realized in a mobile configuration, the product
must be tested and follow the verification process for Unintentional Conducted and Radiated
Emissions in accordance to the FCC and IC guidelines. The module needs to be powered and
placed in the receive mode for this test. The receiver must be tuned to its lowest frequency
channel, mid-frequency channel, and highest frequency channel. Both the WLAN and BT
receivers must be active for the test. The supporting test data does not need to be submitted to
the FCC or IC.
5.7
SAR Testing Requirements for End-Product
Since the TiWi5 radio module was certified in a mobile configuration, the end-product does not
require SAR testing if the end-product is not used within 20cm of the human body, nor used in
conjunction with another radio transmitter.
For portable configurations (antenna-to-body separations of less than 20 cm), the module
integrator must have the module certification re-evaluated, which will include a modification to
the existing certification and additional testing for exposure and SAR requirements.
