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Jean-Michel Monteix
Email: [email protected]
Tel: +33 (0)6 72 39 08 09 Web: http//ww.xxilab.com
XXILab ... eXperience, eXpertise, wIreless
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Design of 4G & Wifi antennas located ina small volume using MWS
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Outline
Introduction & objectives
Problems to face Volume, BW & Sij
Antenna design from the simulation to the field
Selection and placement of antennas versus form factor
Product definition
Development of antennas based on mechanical data
Export data for antenna manufacturing
Optimization, comparison of results & field tests
A new solution for solving coupling issue between 4G & Wifi
Conclusion
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To be able to stream live TV (HD TV or soon VHD TV) on cellular network, several
2/3/4G modem are required: this allows to use at the same time several
communication channel.
In addition, to be portable, these communication tools must be small and capable
of functioning whatever of the country. This device could be attached on a camera
or put in a backpack
Therefore from an antenna point, we had to provide a product including as manyantenna in a small volume as there are modem: 4 to 8 2/3/4G antenna & from 1 to
4 Wifi antenna.
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Introduction & objectives
Finally, the integration of these
antennas should be compatible with aprofessional use in harsh environment
(shock ) and the cost of these
antennas should be as low as possible.
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Problems to face Volume, BW & Sij
2G 2G
.7
698 824 960
.8 .9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7
1575 1710 1990 2170 2450 2700
.6
3G 3G
4G 4G 4G
+64%
+115%+92%
2500
G
P
S
W
i
f
i
Increase of bandwidths has a direct impact on the antenna solution and antenna
dimensions
The use of off the shell antenna becomes more and more critical (4G)
Dimensions 100x30x0.1mm
Frquences 690-940 1720-3130MHz
VSWR
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Antenna design
from the simulation to the field
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Selection of antennas versus form factor
Off the shell antenna Advantage: low development fees
Drawback: volume, cost,
performance/product
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Custom antenna Advantage: volume, performance
versus product, production cost
Drawback: development fees
What product ? What antenna ? What performance ? What location for antenna ?
What volume ? What performance? How much Antenna ? What price?
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The selected solution have been improved for 4G
Antenna concept from 3 to 4G
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Depending on product, a matching strategy will be helpful to cover all 4G bands
Matching requiredMatching not required
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Placement of antennas versus form factor
A parametric investigation have been done to optimize the placement of 8
4G & 4 Wifi antenna
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A tradeoff will done between antenna performance and mechanical design
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A first mechanical envelope will be done based on antenna simulationresults, then the 3D will be imported in CST
Product definition
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It is time to confirm the portability of our concept. If good, the antenna
will be designed then optimized
Development of antennas based on mechanical data
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Every change willtaken into account
Up to the production
CST
Creo
CST
Creo
Export toCreo
Import inCST
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All prototypes will be launch based on the CST antenna component
Export data for antenna manufacturing
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For first prototypes: Export to gerber
For Advanced prototypes & production, we need a unique reference:Export to Creo then CAD layout : panel schematic & production file
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Optimization, comparison of results & field tests
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700 824 960 1710 1990 2170 2500 2700
Simulation realized gain (dB)
Mean gain over the 8 4G ant
-2.9 -0.3 0.3 1.3 2.1 0.9 1.2 2.2
Active measurement normalized
radiated power
Mean gain over the 8 4G antenna
-3.7 -1.1 0.1 1.5 2.6 1.8 2.1 2.3
Delta (8 ant 4G)
Simulation/Measurement
-0.8 -0.8 -0.2 +0.2 +0.5 +0.9 +0.9 +0.1
Very good correlation between simulation & measurement
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When 3G or 4G are at Pmax, Wifi communication drop, or when Wifi is at
Pmax, 3G or 4G sensivity drop
A new solution to solve coupling issue - 4G / Wifi
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Narrow band antenna solution
could be of interest
-12dB isolation are not enough in that case,
a new target have been set to -20dB in 3G
and better than -12dB at 2.5GHz 4G
Today, based on the simulation study, we achieve -20dB between 3G & Wifi
and -15dB at 2.5GHz for 4G. With this, all problems disappeared
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Conclusion
Microwave Studio an essential tool to:
Design product with several multiband antenna
Understand physics & solve problems
Ensure non-regression, up to & during production
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