Frequency Reconfigurable Patch Antenna Design Review Presentation Presented by: Mike Bly, Josh Rohman Advisor: Dr. Prasad N. Shastry.

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Presentation transcript:

Frequency Reconfigurable Patch Antenna Design Review Presentation Presented by: Mike Bly, Josh Rohman Advisor: Dr. Prasad N. Shastry

Presentation Outline MEMS Switch ▫DC-DC Converter, Evaluation Board, Implementation Linear Patch Antenna Design ▫1.227 GHz, GHz Preliminary Impedance Matching Network Remaining Task Schedule

Design Criteria Overview Patch antenna on microstrip board 2 GPS application frequencies ▫24 MHz Bandwidth ▫1.575 GHz Center Frequency (Patch 1) ▫1.227 GHz Center Frequency (Patch 2) Double stub impedance matching network ▫Matched to 50Ω MEMS used for switching method

System Block Diagram

Design Changes Since Proposal Rogers Corporation RO3010 Microstrip Board ▫ε r = 10.2, h = 25 mils Linear Polarization

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

RMSW201 MEMS Operation +/- 90 V GS Actuation Voltage

Switching Method DC-DC Converter: +5V to -90V

DC-DC Converter Timing

Switching Method

Implementing MEMS Via holes to ground plane Four 25 mil (0.635mm) diameter via holes

Implementing MEMS Conductive epoxy over via hole Wire bonding, gold plating

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

MEMS Evaluation Board VT-42 (FR-4) 30 mil Substrate 1.5” by 1.5” Gold Plating Required 2 Coax Connectors Purpose is to test DC-DC Converter; Isolation and Insertion Losses.

MEMS Evaluation Board

Micro-Circuits, Inc. Printed Circuit Board Manufacturer Contact: Robert Modica ▫(630)

1.575 GHz Patch Antenna Design

Simulations: GHz Patch Antenna

1 to 2 GHz Simulation

1.575 GHz Results

1.227 GHz Patch Antenna Design

Simulations: GHz Patch Antenna

1 to 2 GHz Simulation

1.227 GHz Results

Double Stub Matching Network

Antenna and Matching Network

Task Schedule Simulations (in progress) ▫Linear Patch Antenna w/ switches (on/off)  GHz, GHz ▫Impedance Matching Network Board Fabrication ▫MEMS Evaluation Board ▫Microstrip Board ▫Implement MEMS (epoxy/wire bonding) ▫DC-DC Converter

Task Schedule (cont.) Analysis ▫Resonant Frequencies ▫Bandwidth ▫Efficiency ▫Comparison to Simulation Results

Tentative Remaining Schedule Simulations with Impedance Matching ▫Weeks 7-9 Fabrication of Evaluation Board ▫Weeks 7-10 Fabrication of Antenna Network ▫Weeks 8-11 Analysis ▫Weeks 10-End of Semester

Questions?

Sources: Balanis, Constantine A. Antenna Theory: Analysis and Design. 3rd ed. Hoboken, NJ: John Wiley, Print. DeSignor, Jessica A., and Jayanti Venkataraman. "Reconfigurable Dual Frequency Microstrip Patch Antenna Using RF MEMS Switches." IEEE Xplore. May Web. 20 Sept RadantMEMS. APPLICATION NOTE FOR TEST & HANDLING OF SPST RF-MEMS SWITCHES. RadantMEMS, Web. 03 Nov Rebeiz, Gabriel M., and Jeremy B. Muldavin. "RF MEMS Switches and Switch Circuits." IEEE Xplore. Dec Web. 20 Sept 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): Print.