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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2025-01-11
A High-Performance, Thin, Circularly Polarized Microstrip Antenna for Compact Radar Systems
By
Palaniselvan Sundaravadivel,

    Dr. Palaniselvan Sundaravadivel

    Artificial Intelligence and Machine Learning

    Saveetha Engineering College

    India

    Homepage

Sathiyapriya Thangavel,

    Dr. Sathiyapriya Thangavel

    Dr Mahalingam College of Engineering and Technology

    India

    Homepage

Gold Beulah Patturose Jegajothi,

    Dr. Gold Beulah Patturose Jegajothi

    St. Joseph’s Institute of Technology

    India

    Homepage

Meenakshi Rethinasamy,

    Dr. Meenakshi Rethinasamy

    J.J College of Engineering and Technology

    India

    Homepage

Dhanushkodi Siva Sundhara Raja,

    Dr. Dhanushkodi Siva Sundhara Raja

    SACS MAVMM Engineering College

    India

    Homepage

Rajeshkumar Dhandapani

    Dr. Rajeshkumar Dhandapani

    Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology

    India

    Homepage

Progress In Electromagnetics Research Letters, Vol. 124, 31-36, 2025
doi:10.2528/PIERL24111202 | Google Scholar

Abstract
This paper presents a novel, thin, circularly polarized microstrip antenna optimized for radar applications, designed to operate within the 7.5-7.7 GHz frequency band. The antenna is compact, with overall dimensions of 1.97λ x 1.08λ x 0.0025λ (where λ is wavelength calculated at 7.5 GHz) printed on a flexible polyimide substrate, offering advantages in terms of mechanical flexibility and integration into conformal systems. Circular polarization is achieved with an axial ratio of less than 3 dB across the operating bandwidth, while a peak gain of 6.25 dBi ensures adequate signal strength for radar detection and communication. Performance improvements are realized by introducing inverted C-shaped slots in the radiating element, effectively manipulating the surface current distribution and enhancing polarization purity and radiation efficiency. A prototype of the antenna was fabricated and tested, with experimental results closely matching simulation data, confirming the reliability of the design methodology. The results demonstrate that the proposed antenna is highly suitable for compact radar systems, offering an optimal balance among size, performance, and fabrication simplicity.
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Citation
Palaniselvan Sundaravadivel, Sathiyapriya Thangavel, Gold Beulah Patturose Jegajothi, Meenakshi Rethinasamy, Dhanushkodi Siva Sundhara Raja, and Rajeshkumar Dhandapani, "A High-Performance, Thin, Circularly Polarized Microstrip Antenna for Compact Radar Systems," Progress In Electromagnetics Research Letters, Vol. 124, 31-36, 2025.
doi:10.2528/PIERL24111202
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