Design of Product with several 4G and Wifi Antennas located

Design of 4G & Wifi antennas located in
a small volume using MWS
Whatever the environment
XXI-Lab support you !
Jean-Michel Monteix
Email: [email protected]
Web: http//ww.xxilab.com
Tel: +33 (0)6 72 39 08 09
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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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Introduction & objectives
•
•
•
•
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 many
antenna in a small volume as there are modem: 4 to 8 2/3/4G antenna & from 1 to
4 Wifi antenna.
Finally, the integration of these
antennas should be compatible with a
professional 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
Dimensions
Fréquences
690-940 – 1720-3130MHz
Fréquences
VSWR
<2.0:1
$$$
Gain
171x49x12mm
698-960 – 1710-2700MHz
VSWR
0.55-4dBi
50ohm
Gain
De 2 à 4dBi
Dimensions
H85.7xD145.6mm
Dimensions
228x20x5mm
Fréquences
698-960 – 1710-3500MHz
Fréquences
698-960 – 1710-2700MHz
VSWR
<3:1
$$$$$
Gain
Jusqu’à 2dBi
VSWR
<2.5:1
Gain
Jusqu’à 2dBi
$$$$
100x30x0.1mm
$$$$$
Dimensions
Increase of bandwidths has a direct impact on the antenna solution and antenna
dimensions
The use of off the shell antenna becomes more and more critical (4G)
2G
3G
G
P
S
Dimensions
45x13x5mm
Fréquences
698-960 – 1710-2690MHz
VSWR
<2.5:1typ / up to 7(doGP)
Gain
Jusqu’à 2dBi
W
i
f
i
2G
+64%
3G
+115%
+92%
4G
4G
4G
$$
.6
.7
698
.8
824
.9
960
1
1.1
1.2
1.3
1.4
1.5
1575
1.6
1.7
1710
1.8
1.9
1990
2
2.1
2.2
2170
2.3
2450
* For 1K QTY: estimate of solution cost (including support if needed) / $ < 0.5€ // $$ = 1€ // $$$ ≈ 5€ // $$$$ ≈ 10€ // $$$$$ > 10 to 20€
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2.4
2.5
2500
2.6
2.7
2700
Antenna design
from the simulation to the ‘’field’’
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Selection of antennas versus form factor
What volume ? What performance? How much Antenna ? What price?
•
•
Off the shell antenna
–
–
Advantage: low development fees…
Drawback: volume, cost,
performance/product
Custom antenna
–
–
Advantage: volume, performance
versus product, production cost
Drawback: development fees
What product ? What antenna ? What performance ? What location for antenna ?
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Antenna concept – from 3 to 4G
• The selected solution have been improved for 4G
Depending on product, a matching strategy will be helpful to cover all 4G bands
Matching not required
Matching 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
•
A tradeoff will done between antenna performance and mechanical design
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Product definition
• A first mechanical envelope will be done based on antenna simulation
results, then the 3D will be imported in CST
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Development of antennas based on mechanical data
• It is time to confirm the portability of our concept. If good, the antenna
will be designed then optimized
CST
CST
Every change will
taken into account
Up to the production
Creo
Creo
Import in
CST
Export to
Creo
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Export data for antenna manufacturing
• All prototypes will be launch based on the CST antenna component
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
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
Delta (8 ant 4G)
Simulation/Measurement
-3.7
-1.1
0.1
1.5
2.6
1.8
2.1
2.3
-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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A new solution to solve coupling issue - 4G / Wifi
• When 3G or 4G are at Pmax, Wifi communication drop, or when Wifi is at
Pmax, 3G or 4G sensivity drop
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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XXI–Lab ... eXperience, eXpertise, wIreless…

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