Transcript Final Project Presentation

Frequency Reconfigurable Microstrip
Patch Antenna
Final Project Presentation
Presented by: Mike Bly, Josh Rohman
Advisor:
Dr. Prasad N. Shastry
Why Reconfigurable Antennas?
Practical Applications?
Presentation Outline
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Design Specifications
MEMS Switch Implementation
Linear Patch Antenna Design
Antenna Simulations
Inset Feed Matching Network
Design Specifications
• Microstrip patch antenna (Rogers RO3010)
• 2 GPS application frequencies
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24 MHz Bandwidth
1.575 GHz Center Frequency (Patch 1)
1.227 GHz Center Frequency (Patch 2)
Linear Polarization
• Inset Feed matching network
▫ Matched to 50Ω
• MEMS preferred for switching method
System Block Diagram
Patch 1
(1.575 GHz)
Switches?
On
Off
Inset Feed
Matches to 50
ohm
Output to Coax
Connector
Patch 2
Connected
(1.227 GHz)
Switching Method
• MEMS Switch
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RMSW201, RADANT MEMS
0.3dB Insertion Loss @ 2GHz
35dB Isolation Loss @ 2GHz
1.9mm x 1.85mm package size
RMSW201 MEMS Operation
• +/- 90 VGS Actuation Voltage
RMSW201 MEMS Operation
• +/- 90 VGS Actuation Voltage
Implementing MEMS
• RS = RD = 100kΩ
• Stability
Switching Method
+5V Supply
Line
DC-DC
Converter
MEMS Gate
Switching Method
• DC-DC Converter: +5V to -90V
• R2/R1 = Vout/Vref
• R2 = Vout/10uA
+5VDC
-90VDC
Switching Method
• DC-DC Converter: +5V to -90V
+5VDC
-90VDC
Switching Method
• DC-DC Converter: +5V to -90V
+5VDC
-90VDC
Switching Method
• DC-DC Converter: +5V to -90V
+5VDC
-90VDC
DC-DC Converter Timing
Implementing MEMS
• Conductive epoxy, double-stick thermal tape
• Wire bonding, gold plating
MEMS Evaluation Board
MEMS Evaluation Board
MEMS Evaluation Board
MEMS Evaluation Board
MEMS Evaluation Board
Micro-Circuits, Inc.
• Contact: Robert Modica
▫ (630) 628-5764
▫ [email protected]
Patch Antenna Design Step 1
ΔL = 0.412h*[(εeff + 0.3)(W/h + 0.264)]/[( εeff – 0.258)(W/h + 0.8)]
W = c/(2fo*√((εr+1)/2))
L = c/(2fo*√(εr)) – 2ΔL
L = 30mm & W = 40.25mm
L = 38.6mm & W = 40.25mm
Patch Antenna Design Step 2
<-Height = 1mm
L = 30mm & W = 40.25mm
Patch Antenna Design Step 3
Height = 1mm
Height = 1.9mm
L1 = 30mm & W = 40.25mm
1.575 GHz Patch Antenna Design
Simulations: 1.575 GHz Patch Antenna
Simulations: 1.575 GHz Patch Antenna
• 1 to 2 GHz Simulation
1.575 GHz Results
1.227 GHz Patch Antenna Design
Simulations: 1.227 GHz Patch Antenna
Simulations: 1.227 GHz Patch Antenna
• 1 to 2 GHz Simulation
1.227 GHz Results
Inset Feed Matching Network
INSET FEED
Freq
Length(mm)
Width(mm)
1.227
34.06
40.25
1.575
30
40.25
Zin(real)
Zin(imag)
Wo(mm)
Er
Ereff
Zo
10.2
9.818024134
47.16779462
10.2
9.818024134
67.47522359
Yo(mm)
Pi
135.902
-14.159
0.59567
10.2
3.14159
290.732
-28.368
0.59567
10.2
3.14159
Inset Feed Design Step 1
y0 = [Cos-1(Z0/Zin)]2*(L/π)
W0 = 0.6mm (50Ω microstrip line)
W 1 = W0
Inset Feed Design Step 2
Height = 1mm
L = 30mm & W = 40.25mm & y0 = 10.25mm
Inset Feed 1.575Ghz Simulation
Simulations: 1.575 GHz Inset
1.575 GHz Inset Results
Inset Feed 1.227Ghz Simulation
Simulations: 1.227 GHz Inset
1.227 GHz Inset Results
Antenna System Layout
Fabricated Antenna System
Questions?
Sources:
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Application Note for MAX774 DC-to-DC Converter. RadantMEMS, 2007. Web. Nov. 2011.
<http://www.radantmems.com/radantmems.data/Library/MAX774%20DC-DC%20Converter_1.2.pdf>.
Application Note for Test & Handling of SPST RF-MEMS Switches. RadantMEMS, 2007. Web. Nov. 2011.
<http://www.radantmems.com/radantmems.data/Library/App_notes_1.6.pdf>.
Balanis, Constantine A. Antenna Theory: Analysis and Design. 3rd ed. Hoboken, NJ: John Wiley, 2005. Print.
DeSignor, Jessica A., and Jayanti Venkataraman. "Reconfigurable Dual Frequency Microstrip Patch Antenna
Using RF MEMS Switches." IEEE Xplore. May 2007. Web. 20 Sept. 2011.
Rebeiz, Gabriel M., and Jeremy B. Muldavin. "RF MEMS Switches and Switch Circuits." IEEE Xplore. Dec. 2001.
Web. 20 Sept. 2011.
SPST, High-Isolation, RF-MEMS Switch DC to 20 GHz. RadantMEMS, 2007. Web. 28 Oct. 2011.
<http://www.radantmems.com/radantmems.data/Library/Radant-Datasheet201_1.4.pdf>.
Yang, Songnan, Chunna Zhang, Helen K. Pan, Aly E. Fathy, and Vijay K. Nair. "Frequency Reconfigurable
Antennas for Multiradio Wireless Platforms." IEEE Microwave Magazine (2009): 67-84. Print.