Frequency Reconfigurable Microstrip Patch Antenna

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Presentation transcript:

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 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 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

Switching Method MEMS Switch RMSW201, RADANT MEMS 0.3dB Insertion Loss @ 2GHz 35dB Isolation Loss @ 2GHz 1.9mm x 1.85mm package size SPST, DC to 20GHz, Wire Bonding, +/- 90V Gate-Source Voltage

RMSW201 MEMS Operation +/- 90 VGS Actuation Voltage

RMSW201 MEMS Operation +/- 90 VGS Actuation Voltage

Implementing MEMS RS = RD = 100kΩ Stability Minimize Hot-Switching

Switching Method

Switching Method DC-DC Converter: +5V to -90V R2/R1 = Vout/Vref R2 = Vout/10uA +5VDC The p-channel MOSFET Q1 switches on and off, controlling the output voltage (-90V). When the voltage across L1 exceeds 210mV, an internal voltage comparator indirectly measures the current passing through the MOSFET. This shuts off the MOSFET, discharges the inductor L1, and charges the Capacitor C4 -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 Timing in us

Implementing MEMS Conductive epoxy, double-stick thermal tape Wire bonding, gold plating

MEMS Evaluation Board RO3010 25 mil Substrate 1.5” by 6” Gold Plating Required 8 Coax Connectors 1.6x0.8mm SMT Resistors Test DC-DC Converter Measure Isolation and Insertion Losses

MEMS Evaluation Board RO3010 25 mil Substrate 1.5” by 6” Gold Plating Required 8 Coax Connectors 1.6x0.8mm SMT Resistors Test DC-DC Converter Measure Isolation and Insertion Losses

MEMS Evaluation Board RO3010 25 mil Substrate 1.5” by 6” Gold Plating Required 8 Coax Connectors 1.6x0.8mm SMT Resistors Test DC-DC Converter Measure Isolation and Insertion Losses Determine effects of MEMS’ ground plane

MEMS Evaluation Board RO3010 25 mil Substrate 1.5” by 6” Gold Plating Required 8 Coax Connectors 1.6x0.8mm SMT Resistors Test DC-DC Converter Measure Isolation and Insertion Losses

MEMS Evaluation Board RO3010 25 mil Substrate 1.5” by 6” Gold Plating Required 8 Coax Connectors 1.6x0.8mm SMT Resistors Test DC-DC Converter Measure Isolation and Insertion Losses

Micro-Circuits, Inc. Contact: Robert Modica (630) 628-5764 microcir@aol.com

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 = 1.9mm Height = 1mm 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 Freq Length(mm) Width(mm) Er Ereff Zo 1.227 34.06 40.25 10.2 9.818024134 47.16779462 1.575 30 67.47522359 Zin(real) Zin(imag) Wo(mm) Yo(mm) Pi 135.902 -14.159 0.59567 3.14159 290.732 -28.368

Inset Feed Design Step 1 y0 = [Cos-1(Z0/Zin)]2*(L/π) W0 = 0.6mm (50Ω microstrip line) W1 = 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: 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.