DESIGN OF PRINTED DIPOLE ARRAYWITH REFLECTOR

Authors: Jean Marie FLOC’HJean Michel DENOUALPhilippe RENAUDIN

Presented by: Jean-Marie FLOC’H

Outline

• Goals• Single dipole• Array without reflector• Array with reflector• 4 element dipole array with reflector and one director• 4 element dipole array with reflector and one director• 2 x 4 array• 4 x 4 array• conclusion

Goals

• Dipole array with high gain• Simple feeding structure• Compact structure• Limitation of the backside radiation

without metallic reflectorwithout metallic reflector• Increase the gain• Have the capability to have special current

distribution with simple feeding• Have the capability to integrate the

antenna on the PCB

Single Dipole

Measurement and SimulationGain at 0°°°°and 180°°°° (2.54 dBi and2.4dBi)

Single Dipole (3D)

Single Dipole with reflector

Measurement and SimulationIncrease the gain at 0 °°°° and decrease at 180 °°°°

(5.4 dBi and -1.7 dBi)

Single Dipole with reflector (3D)

Single Dipole with reflector et director

-25,00

-20,00

-15,00

-10,00

-5,00

0,00

2 2,2 2,4 2,6 2,8 3 3,2 3,4 3,6 3,8 4

S11

(dB

)Measurement and Simulation

Increase the gain at 0 °°°° and decrease at 180 °°°°(7.4 dBi and -5dBi)

-40,00

-35,00

-30,00

Frequency (GHz)

measurement simulation

Single Dipole with reflector et director (3D)

Dipole with multi directors

8

10

12

14

16

18

n in

dB

i

Simulated gain

Measured gain

0

2

4

6

8

0 5 10 15 20 25 30 35

Number of directors

Gai

n Measured gain

Example of 8 director antenna

Simulated and measured Reflection coefficient

Antenna with 8 directors

Simulated and measured radiation pattern of the ant enna with 8 directors at 3 GHz in E and H plan.

Antenna with 8 directors (3D)

Dipole array without reflector

Feeding micro strip line

Simulated radiation pattern of the array without re flectorsat 3 GHz in E and H plan.

Back side of the micro strip line

at 3 GHz in E and H plan.

Measured radiation pattern Gain in bore side = 8dBiGain in back side = 2.5 dBi

Dipole array with reflector

Back side of the micro strip line and the reflectors.

Simulated radiation pattern of the array with refle ctorsSimulated radiation pattern of the array with refle ctorsat 3 GHz in E and H plan.

Measured radiation pattern of the array with reflec tors

Gain in bore side = 10 dBiGain in back side = -5 dBi

4 element dipole array with reflector and one director

Frequency in GHzSimulated ( ----) and measured ( ___)

reflection coefficient of the 4 element array

with reflectors and directors.

Current distribution : 0.5 1 1 0.5

First side lobe at -23 dBBeamwidth 20.5 °°°° (simulation)

4 element dipole array with reflector and one director

Simulated radiation pattern of the array with reflectors at 3 GHz in E and H plan.

Measured radiation pattern of the array

Measured gain 11.7 dBi Simulated gain 12.2 dBi

Backside radiation-5 dBi in simulation-9 dBi in measurements

4 element dipole array with reflector and one

director

4 dipole array

6

8

10

12

14

4 dipole array

0

2

4

6

2800 2850 2900 2950 3000 3050 3100 3150 3200

Measured Gain in dBi versus the frequency in MHz

The maximum gain 11.7 dBi is obtained at 3Ghz

4 element dipole array with reflector and one director

Measured radiation pattern in E plan and H plan co and cross polarisation at 3 GHz

The first side lobe level is – 18 dB under the maximumBeamwidth 19.5°

4 element dipole array with reflector and one director

(3D)

2 x 4 dipole array

Measured reflection coefficient of the 2x4 dipole ar ray with reflectors and directors.

2 x 4 dipole array Simulation

Simulation at 3 GHzThe maximum gain is 15 dBi at 3 GHz

2 x 4 dipole array

8

10

12

14

16

Measured radiation pattern of the 2x4 dipole arraywith reflectors and directors at 3 GHz.

4

6

2800 2850 2900 2950 3000 3050 3100 3150 3200

Frequency in MHz

Measured gain of the 2x4 dipole array

The maximum gain is 15.12 dBi at 3 GHz

4 x 4 dipole array

4 x 4 dipole array

Measured reflection coefficientof the 4x4 dipole array Current distribution : 0.5 1 1 0.5

In the power divider

4 x 4 dipole array

14,5

15

15,5

16

16,5

17

17,5

18

gain in dBi

Measured radiation pattern of the 4x4 dipole array

with reflectors and directors at 3.125 GHz.

Frequency in MHz

Measured gain of the 4x4 dipole array

The maximum gain is 17.68 dBi at 3.125 GHzWith and without compensation of the

matching

13

13,5

14

14,5

2950 2975 3000 3025 3050 3075 3100 3125 3150 3175 3200

Conclusion

• we propose a technique to reduce the back side radiation of printed antenna.

• This new structure is compact and has a very simple feeding network.

• The technique has been simulated and measured with different structure.

• Finally we obtain a 2 x 4 array with a measured maximum gain around 15.1 dBi (3 GHz)

• And 17.7 dBi with 4 x 4 array (3.1 GHz)

References

REFERENCES

[1] J.M. Floc'h, F. Queudet, E. Fourn"Design of printed dipole with reflector" EUCAP 2007 Birmingham UK.

[2] IETR communications and internal reports 2000-2003.

[3] E.avila-navarro, J.A. Carrasco, C.Reig"Desing of yagi-like printed antennas for wlan applications" MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.49,No.9, September 2007.

[4] J.M. Floc'h, hatem Rmili "Desing of multiband printed dipole antennas using parasitic elements" MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.48, No. 8, August 2006.

[5] Noriaki Kaneda, W.R.Deal, Yongwi Qian, Rod Waterhouse, and Tatsuo Itho"A Broad-Band Planar Quasi-Yagi Antenna" IEEETRANSACTIONONANTENNASAND PROPAGATION, VOL. 50, NO. 8, AUGUST 2002

[6] Floc’h J.M., Denoual J.M., Sallem K. « Design of Printed Dipole with Reflector and Multi Directors » LAPC 2009 , Loughborough UK, 16-17 november 2009

[7] Floc’h J.M., Denoual J.M., Renaudin P.« DESIGN OF PRINTED DIPOLE ARRAY WITH REFLECTOR »EUCAP 2010 Barcelone Spain.