frequency reconfigurable microstrip patch antenna

Frequency Reconfigurable Microstrip Patch AntennaAntenna and Microwave Laboratory (AML)

Student: Rafid N. Damman Professor: Dr. Satish K. Sharma

Graduate Student Mentor: Jennifer TaylorProject Goals

•Microstrip patch antenna that can be reconfigured to operate at two frequencies:1.8GHz and 2.4GHz•Find the best parameters for the antenna to achieve the best gain, matching, and acceptable radiation pattern.•Utilized PIN Diode RF switches to make the antenna reconfigurable•Ansoft/AnSys HFSS software used to model the RF switches and patch antenna.

Approach

•Upon knowing the thickness and the dielectric constant of the substrate material I can calculate the width and length of my rectangular patch using the equations given in the Antenna Theory and Design textbook by Balanis.•I run many simulations to find the exact configurations for the two different lengths to have a resonant frequency of 1.8GHz and 2.4GHz and the best matching levels. •Finally, I will include five PIN Diode switches to be able to add the specified length to the antenna so that the single antenna can operate at the two different frequencies.

2D Radiation Pattern: 1.8GHz

2D Radiation Pattern: 2.4GHz

S11

1.50 1.75 2.00 2.25 2.50Freq [GHz]

-20.00

-17.50

-15.00

-12.50

-10.00

-7.50

-5.00

-2.50

0.00

Y1

Ansoft LLC HFSSDesign 1.8 2.4 Ideal (ON)S11 Frequency Reconfigurable Microstrip Patch Antenna ANSOFT

m1

m2

m4

m5 m6m3

Curve Info

dB(S(2,2))Setup1 : Sw eep1

dB(S(2,2))_1Imported

Name X Y

m1 1.7999 -19.7207

m2 1.7434 -9.9263

m3 1.8536 -10.1796

m4 2.4000 -16.2450

m5 2.3622 -9.9737

m6 2.4277 -9.7291

All Switches ON

All Switches OFF

Conclusion

•The reconfigurable microstrip patch antenna was designed with two different frequencies to operate from 1.75GHz to 1.85GHz and 2.36GHz to 2.42GHz depending on the ON or OFF state of the five switches. •These two bands are used in many wireless communication applications including cell phone and Bluetooth technologies.

3D Radiation Pattern: 2.4GHz

3D Radiation Pattern: 1.8GHz

Antenna Geometry

KeySubstrate thickness: 0.8mmSubstrate Dielectric Constant: 4.4PIN Diode:

-54.00

-38.00

-22.00

-6.00

90

60

30

0

-30

-60

-90

-120

-150

-180

150

120

Ansoft LLC HFSSDesign 1.8 Ghz Final (SMA Better Position)Radiation Pattern 1.8Ghz ANSOFT

m1

m2

Curve Info

dB(RealizedGainPhi)Setup1 : Sw eep1Freq='1.8GHz' Phi='0deg'

dB(RealizedGainPhi)Setup1 : Sw eep1Freq='1.8GHz' Phi='90deg'

dB(RealizedGainTheta)Setup1 : Sw eep1Freq='1.8GHz' Phi='0deg'

dB(RealizedGainTheta)Setup1 : Sw eep1Freq='1.8GHz' Phi='90deg'

Name Theta Ang Mag

m1 0.0000 0.0000 2.0282

m2 90.0000 90.0000 -33.6144

-54.00

-38.00

-22.00

-6.00

90

60

30

0

-30

-60

-90

-120

-150

-180

150

120

Ansoft LLC HFSSDesign 1.8 2.4 Ideal (OFF) EXPERIMENTRadiation Pattern 2.4Ghz ANSOFT

m1

m2

Curve Info

dB(RealizedGainPhi)Setup1 : Sw eep1Freq='2.4GHz' Phi='0deg'

dB(RealizedGainPhi)Setup1 : Sw eep1Freq='2.4GHz' Phi='90deg'

dB(RealizedGainTheta)Setup1 : Sw eep1Freq='2.4GHz' Phi='0deg'

dB(RealizedGainTheta)Setup1 : Sw eep1Freq='2.4GHz' Phi='90deg'

Name Theta Ang Mag

m1 0.0000 0.0000 3.5342

m2 90.0000 90.0000 -21.7073

Research Supported by: NSF CAREER Grant #

ECCS-0845822