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This study presents a novel antenna array synthesis method extending the Orchard-Elliott-Stern technique. The method achieves reduced side lobes and adaptable beamwidths for wireless communications.

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Antenna Theory

Background:

  • Antenna array synthesis is crucial for directing radio waves.
  • Existing methods like Orchard-Elliott-Stern have limitations in controlling radiation patterns.
  • Achieving low side lobe levels (SLL) and adaptive beamwidth is essential for modern wireless systems.

Purpose of the Study:

  • To present an extended Orchard-Elliott-Stern technique for antenna array synthesis.
  • To explore radiation patterns with specific root configurations on the Shelkunoff unit circle.
  • To enable the design of antenna arrays with reduced side lobes and controllable beamwidths.

Main Methods:

  • Extension of the Orchard-Elliott-Stern technique.
  • Utilizing three roots on the negative real axis of the Shelkunoff unit circle (one on, two off at r and 1/r).
  • Application to Dolph-Chebyshev patterns with varying element numbers (10, 18, 40) and λ/2 spacing.

Main Results:

  • The method allows multiple solutions for a desired SLL by varying 'r', yielding different amplitude ratios.
  • Resulting radiation patterns exhibit two fewer side lobes compared to conventional methods.
  • Demonstrated applicability across various array sizes, from small to large.

Conclusions:

  • The presented technique offers a flexible approach to antenna array synthesis.
  • It effectively reduces side lobes and provides control over beamwidth and directivity.
  • Findings are directly applicable to wireless communications requiring low SLL and adaptive beamwidth patterns.