panel antenna 2011-2012 capstone senior design
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Panel Antenna2011-2012 Capstone Senior Design
Technical Presentation: April 27, 2012
Sponsored by:
Website: seniordesign.engr.uidaho.edu/2011-2012/panelantenna
The TeamAllan Davis: Project Lead
Carlos Gonzalez: Budget/Resource Manager
Cooper McBride: Website Developer
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ObjectiveDesign, fabricate and test a 900-Mhz
directional panel antenna for Schweitzer Engineering Laboratories
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ApplicationsRadios provide comm channels for electric utility
protection, monitoring, and controlEconomical alternative to fiber-optic cableBackup primary protection channelsMany more possible applications of wireless
communications for critical infrastructure
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What SEL NeedsAn antenna that will have performance similar to
antennas that are currently supplied by outside sources
The antenna will be used with the SEL-3031 Serial Radio Transceiver
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Yagi AntennaSEL is currently selling directional Yagi
antennas with the SEL-3031An example of a 5-element Yagi is shown here
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Design ProcessResearch of existing antenna designsComputer simulations using Agilent EMPro
softwareFinite-difference time-domain (FDTD)Finite element method (FEM)
We fabricated several design variations based on our simulation results
We tested the designs with different backplate spacings using SELs RFI chamber
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Final DesignDirectional Bowtie Antenna
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Far-Field Radiation Patterns
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Horizontal Plane
TestedSimulated
Main Lobe
Side Lobes
Main Lobe
Back Lobe
SpecificationsOperating frequency range: 900-930 MHzDirectionalUsed for either vertical or horizontal
polarizationGain ≈ 6 dBi3-dB Beamwidth ≈ 65°Designed using printed circuit board technologyFR-4 substrateBackplate spacing: 83 mm (λ/4)
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Challenges during the projectSoftware
PC compatibility issuesConvergence issuesSimulation times ranged from ½ hour to 7
hoursCorrectly interpreting simulation results
Extensive trial and error to get useable dataLimited availability of RFI chamber
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Recommendations for future workInvestigate using an array of 2-4 bowtie
elements for improved directionalityMatch the input impedance to 50 Ω using a
microstrip matching network (quarter-wave impedance transformer, etc.)
The antenna should be characterized by a professional antenna laboratory before production
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Special ThanksAdvisors:
Dr. Greg DonohoeDr. Touraj Assefi
Sponsors: Eric Sagen Henry Loehner
Dr. Jeff YoungDr. Chris Wagner
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Questions?
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