Synthesising a Fixed-Length Equispaced Linear Array to Produce Dolph-Chebyshev Patterns with Deep Nulls, a Desired...

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.