design of 4g and wifi antennas

8/12/2019 design of 4g and wifi antennas

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Jean-Michel Monteix

Email: [email protected]

Tel: +33 (0)6 72 39 08 09 Web: http//ww.xxilab.com

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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.


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


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


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


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


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


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

-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


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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