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FSS JODY-W263 Integration Instructions Rev 02.docx
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5.2.2.2 Integrated Antenna Design
If integrated antennas are used, the transmission line is terminated by the antennas themselves.
Follow the guidelines mentioned below:
•
The antenna design process should start together with the mechanical design of the
product. PCB mock-ups are useful in estimating overall efficiency and radiation path of
the intended design during early development stages.
•
Use antennas designed by an antenna manufacturer providing the best possible return
loss (or VSWR).
•
Provide a ground plane large enough according to the related integrated antenna
requirements. The ground plane of the application PCB may be reduced down to a
minimum size that must be similar to one quarter of wavelength of the minimum
frequency that has to be radiated, however overall antenna efficiency may benefit from
larger ground planes. Proper placement of the antenna and its surroundings is also
critical for antenna performance. Avoid placing the antenna close to conductive or RF-
absorbing parts such as metal objects or ferrite sheets as they may absorb part of the
radiated power, shift the resonant frequency of the antenna or affect the antenna
radiation pattern.
•
It is highly recommended to strictly follow the specific guidelines provided by the
antenna manufacturer regarding correct installation and deployment of the antenna
system, including PCB layout and matching circuitry.
•
Further to the custom PCB and product restrictions, antennas may require
tuning/matching to reach the target performance. It is recommended to plan
measurement and validation activities with the antenna manufacturer before releasing
the end-product to manufacturing.
•
The receiver section may be affected by noise sources like hi-speed digital busses. Avoid
placing the antenna close to busses as DDR or consider taking specific countermeasures
like metal shields or ferrite sheets to reduce the interference.
Take care of interaction between co-located RF systems like LTE sidebands on 2.4 GHz band.
Transmitted power may interact or disturb the performance of JODY-W2 modules where specific
LTE filter is not present.
6
Antenna Reference Design
6.1
Scope
This document defines the essential specifications necessary to implement the JODY-W2
antenna reference designs as used in certification. It is part of the equipment certification
application issued to FCC and ISED. The information contained herein and its references should
be sufficient to guide a skilled person to implement the design on a host carrier. It will provide
the designer with PCB layout details and expected performance specifications.
