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Coherently Radiating Periodic Structures to Reduce the Number of Phase Shifters in a 2-D Phased Array.

Elizvan Juárez1, Marco A Panduro1, David H Covarrubias1

  • 1CICESE Research Center, Electronics and Telecommunications Department, Carretera Ensenada-Tijuana No. 3918, Zona Playitas, Ensenada 22860, Mexico.

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Summary

This study introduces coherently radiating periodic structures (CORPS) to feed 2-D phased arrays, significantly reducing phase shifter devices. This innovative feeding network enables substantial PS reduction and enhances scanning capabilities.

Keywords:
2-D phased arraybeam-scanningcoherently radiating periodic structuresphase shifterside lobe level

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Area of Science:

  • Electromagnetics and Antenna Theory
  • Microwave Engineering
  • Array Antenna Design

Background:

  • Feeding networks for 2-D phased arrays typically require a large number of phase shifter (PS) devices.
  • Reducing the number of PS devices is crucial for cost and complexity reduction in phased array systems.
  • Achieving efficient cophasal excitation across array elements is a key challenge.

Purpose of the Study:

  • To propose and evaluate novel design configurations for feeding 2-D phased arrays using coherently radiating periodic structures (CORPS).
  • To demonstrate the capability of CORPS in reducing the number of phase shifter devices required for array excitation.
  • To analyze the impact of CORPS-based feeding on the scanning performance and radiation characteristics of 2-D phased arrays.

Main Methods:

  • Development of three distinct design configurations utilizing CORPS networks (2x3 and 4x7 blocks).
  • Modeling of phased array feeding networks to ensure cophasal excitation of antenna elements.
  • Full-wave electromagnetic simulations to validate the performance of the proposed configurations.

Main Results:

  • Achieved a significant reduction in the number of PS devices, up to 69%, for a wide scanning range (±25° elevation, ±40° azimuth).
  • Demonstrated effective cophasal excitation across antenna elements using strategically placed CORPS blocks.
  • Obtained radiation patterns with low peak side lobe levels (SLL_PEAK ≈ -19 dB and -23 dB) using raised cosine amplitude distribution.

Conclusions:

  • CORPS offer an effective solution for feeding 2-D phased arrays, leading to substantial PS device reduction.
  • The proposed CORPS configurations enhance scanning capabilities while maintaining desirable radiation characteristics.
  • This approach presents a strategic advancement in the design of efficient and cost-effective phased array antenna systems.