Micropatch Antenna Array

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Micropatch Antenna Array

• Joey Guerra, Juan Herrera, George Valdovinos

ECE 345 Presentation
2
Application

• Utilized as a transmitting/receiving antenna for
  a wireless LAN system

3
Initial Goals

• Design and Build a 2 X 2 array
• Operating Frequency at 5.8 GHz with a bandwidth
  of 2.16
• Optional/additional design includes beam scanning

4
Why an Array?

• Specific directional radiation pattern
• Identical radiating patch elements can be
  spatially manipulated to achieve this goal
• Ideal pattern
• the array factor
• mirror theory

5
Materials

• Duroid
• Low variation for er
• High resistance to moisture
• Good electrical and mechanical properties

6
Design Approach

• Sources
• Antenna Theory and Design by Warren L. Stuztman
• Antenna Theory by Constantine A. Balanis
• Procedure
• Calculate length (Stutzman)
• Calculate ereff (Balanis)
• Calculate width (Balanis)
• Calculate bandwidth (Stutzman)
• Calculate network parameters (Balanis)

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Design Approach (cont.)

• Numerical, Design, and Simulation Software
• Mathematica
• Sonnet
• Puff
• Corel Draw
• Easytrax
• ADS
• HPVEE

8
Design Approach (cont.)

• Methods of Fabrication
• Milling
• Etching
• Instrumentation
• Anechoic Chamber
• Network analyzer (8510 8753C)

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Results
First Trial Patch
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Results (cont.)
Subsequent Trial Patches
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Results (cont.)
Initial Linear Array
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Results (cont.)
Modified Trial Patch
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Modification of Design

• Problems with initial patches and array
• Fabrication methods
• Design software
• Numerical parameters
• Stutzman
• interrelating Stutzman and Balanis
• Errors in matching networks
• inlet feeds
• feedline networks(quarter-wave transformers)

14
Modification of Design (cont.)

• Problems (cont.)
• capacitative effects
• mitered corners
• T-network
• Discontinuities

15
Modification of Design (cont.)

• The Design Algorithm
• Step 1 Choose arbitrary width or
  calculate width (Balanis)
• Step 2 Calculate ereff
• Step 3 Calculate Length
• Step 4 Calculate Bandwidth
• Step 5 Calculate network dimensions

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Results
Final Trial Patch
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Results (cont.)
Matching Network
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Results (cont.)
Final Linear Array
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Results (cont.)
Final Linear Array with Mitered Corners
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Conclusions

• Error Analysis
• Suggested Improvements