LEE- Uydu Haberleşme ve Uzaktan Algılama Lisansüstü Programı

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http://hdl.handle.net/11527/19486

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Yazar "Kartal, Mesut" ile LEE- Uydu Haberleşme ve Uzaktan Algılama Lisansüstü Programı'a göz atma
  • Öge
    Design, simulation, and fabrication of a circularly polarized MIMO antenna with improved isolation
    (Graduate School, 2025-03-07) Tashvigh, Vala ; Kartal, Mesut ; 705182009 ; Satellite Communication and Remote Sensing
    Circularly polarized (CP) antennas have become increasingly integral in modern wireless communication systems due to their unique ability to address common challenges such as multipath fading and polarization mismatch. These capabilities make them highly desirable for Wireless Local Area Networks (WLAN) applications, Industrial, Scientific, and Medical (ISM) bands, and satellite communications. One of the most notable advantages of CP antennas over their linearly polarized counterparts is their ability to eliminate the need for precise alignment between transmitting and receiving antennas. This feature significantly enhances flexibility in system design and operational convenience, particularly in scenarios involving dynamic or unpredictable antenna orientations. Integrating CP antennas with multiple-input multiple-output (MIMO) systems further elevates their utility in wireless communication. MIMO technology employs multiple antenna elements to achieve several critical performance enhancements, including increased channel capacity, diversity gain, improved data rates, and enhanced signal quality. These benefits are pivotal for meeting the ever-growing demands for high-speed, reliable communication in modern applications. However, the close proximity of multiple antenna elements in MIMO systems often leads to mutual coupling, which can degrade isolation and correlation performance, thereby limiting the overall system efficiency. To address these challenges, this study proposes a novel CP MIMO antenna design that incorporates an innovative decoupling structure. This design specifically targets the reduction of mutual coupling between adjacent antennas, thereby enhancing isolation and overall performance. The proposed antenna design demonstrates significant advancements over conventional CP MIMO antennas, making it a robust solution for high-performance wireless communication systems. The experimental evaluation of the proposed CP MIMO antenna reveals impressive performance metrics. The isolation between the antenna ports achieves a minimum value of 15.2 dB, marking a substantial improvement compared to conventional designs. This enhanced isolation directly contributes to reduced inter-port interference, which is crucial for maintaining signal integrity and achieving optimal MIMO performance. Additionally, the antenna exhibits commendable gain values of 6.28 dBic for right-hand circular polarization (RHCP) and 6.05 dBic for left-hand circular polarization (LHCP). These gain values indicate the antenna's ability to effectively radiate and receive circularly polarized signals, making it highly suitable for applications requiring robust polarization performance. The peak efficiency of the antenna exceeds 62%, highlighting its energy-efficient design. Such efficiency levels are critical for modern communication systems, where minimizing power consumption without compromising performance is a key requirement. Furthermore, the use of parasitic elements as decoupling stubs in the design plays a pivotal role in minimizing mutual coupling. These stubs act as reactive loads, altering the electromagnetic interaction between adjacent antennas. By strategically tuning the length and position of the stubs, the design achieves near-ideal impedance matching and optimized current distribution, leading to enhanced isolation and stable radiation patterns. The innovative features of the proposed CP MIMO antenna have a direct and positive impact on overall system performance. The stable radiation patterns ensure consistent coverage and signal quality across the operating frequency band, while the enhanced isolation minimizes the risk of interference and signal degradation. These attributes make the antenna particularly well-suited for environments characterized by high data traffic and stringent performance requirements, such as satellite communications, WLAN, and ISM band applications. Moreover, the dual-sense circular polarization of the antenna enables it to handle diverse signal orientations effectively. The RHCP and LHCP capabilities ensure compatibility with various transmission and reception scenarios, further enhancing the antenna's versatility. This dual-sense feature, combined with the superior isolation and gain characteristics, makes the proposed antenna an ideal choice for advanced MIMO systems that demand high reliability and performance. In conclusion, the CP MIMO antenna proposed in this work represents a significant advancement in antenna design for high-performance wireless communication systems. By incorporating an innovative decoupling structure and optimizing the use of parasitic elements, the antenna achieves remarkable isolation, stable radiation patterns, and efficient multipath handling. These features collectively ensure superior performance in challenging communication environments, where reliability and data integrity are paramount. The experimental results validate the antenna's potential for real-world applications, demonstrating its suitability for use in WLAN, ISM bands, and satellite communications. The enhanced isolation of 15.2 dB, gain values of 6.28 dBic and 6.05 dBic, and efficiency exceeding 62% position the proposed antenna as a cutting-edge solution for modern wireless systems. Its ability to address mutual coupling and polarization challenges makes it a valuable asset for next-generation MIMO systems, paving the way for reliable and high-speed communication in diverse scenarios. This work not only highlights the potential of CP MIMO antennas in advancing wireless technology but also provides a foundation for future research and development. The innovative design principles and performance optimizations presented here can serve as a benchmark for developing even more efficient and versatile antenna systems, driving further progress in the field of wireless communications.