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Open research questions in Antenna Design and Analysis

97 gap statements mined from Antenna Design and Analysis papers in our 4.5M-paper local library, which holds 792 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • There is a need for compact and efficient terahertz antenna designs. Prior work has focused on the design and investigation of terahertz antennas, but there is a gap in the development of quad-band MIMO antennas. The paper identifies the need for antennas with lower coupling and higher isolation at operating frequency bands.

    Quad-Band Truncated Square-Shaped MIMO Terahertz Antenna for Beyond 5G and 6G Communications · 2026 · DOI

  • This yields a tractable and physically consistent uplink signal model for a multi-PA pinching-antenna system (PASS), which has not been established for conventional PASS using a single long waveguide.

    Uplink and Downlink Communications in Segmented Waveguide-Enabled Pinching-Antenna Systems (SWANs) · 2026 · DOI

  • To address these challenges, future research should focus on (i) developing low-loss and highly reliable RF-MEMS for high-frequency applications, (ii) optimizing tunable metamaterials such as liquid crystal and phase-change materials for low-voltage and wearable systems, and (iii) designing ML-driven frameworks for real-time adaptive frequency tuning in dynamic wireless environments.

    A Comprehensive Review on Frequency Reconfigurable Antennas for 4G, 5G and sub-6 GHz Systems with Emerging Techniques · 2026 · DOI

  • Further research can be done to improve the gain and radiation efficiency of the antenna. The antenna can be optimized for other frequency bands and applications.

    A compact array antenna with enhanced-gain end-fire radiators for 28 GHz millimeter-wave user equipment · 2026 · DOI

  • The need for a compact frequency-band tunable antenna for Personal Area Network Applications. The lack of a simple and efficient solution for reconfigurable wireless applications.

    Frequency band tunable antenna with parasitic element to switch between narrow band and notched UWB for Personal Area Network Applications · 2026 · DOI

  • Further research can be done to improve the beam steering range. The use of QCN elements can be explored in other antenna designs.

    4×1 Quarter-Circle Notched array antenna with independent feeding for enhanced beam steering mechanism at C-band frequency · 2026 · DOI

  • Prior work has not addressed the issue of poor isolation in compact radar designs. Planar configurations have limited isolation due to mutual coupling. There is a need for a novel decoupling unit to improve isolation.

    Isolation enhancement in a compact 2.4 GHz antenna pair for radar systems · 2026 · DOI

  • The antenna design is limited to a specific frequency range. The use of PVC enclosure may affect the antenna's performance in certain environments.

    Interaction driven artificial magnetic conductor and defected ground structure integrated microstrip antenna for subsurface communication · 2026 · DOI

  • Existing antennas have limited performance due to the lack of effective radiation pattern engineering. There is a need for antennas with improved gain and bandwidth for subsurface communication applications.

    Interaction driven artificial magnetic conductor and defected ground structure integrated microstrip antenna for subsurface communication · 2026 · DOI

  • The gap in existing research is the difficulty in achieving high gain at mm-wave frequencies due to antenna miniaturization. The paper identifies the challenge of achieving circular polarization at mm-wave frequencies in complex communication and sensor systems. The gap also includes the lack of a compact and high-gain antenna array that can operate effectively in dusty environments.

    Metasurface-enabled high-gain circularly polarized antenna array for sensing in dust-laden environments · 2026 · DOI

  • The gap is that the influence of non-ideal terminations on key MIMO performance parameters has not been systematically investigated. The gap is that most reported MIMO antennas assume ideal excitation conditions and do not account for non-ideal terminations.

    Analysis of Effects of Different Loads on Diversity Parameters of a 4-port Multiband MIMO Antenna · 2026 · DOI

  • While modeling pinching antennas (PAs) as isotropic point radiators has enabled tractable analyses and demonstrated the performance gains of PASS, their practical radiation characteristics remain underexplored.

    Unlocking Directional Radiation in Pinching-Antenna Systems: Geometry-Aware Design and Experimental Verification · 2026

  • The need for compact and efficient antennas for millimeter-wave applications at 28 and 38 GHz. The challenge of achieving robustness against polarization mismatch and high diversity gain in mm-Wave antennas. The lack of antennas that can operate with orthogonal circular polarizations within the same MIMO structure.

    Compact two-port MIMO antenna dual-circularly polarized 28/38 GHz with polarization diversity for 5G and beyond millimeter-wave systems · 2026 · DOI

  • The narrow bandwidth of microstrip patch antennas limits their use in Wi-Fi applications. Conventional optimization approaches consume days of electromagnetic simulation time.

    ML Based Bandwidth Improvement of Microstrip Patch Antenna for Wi-Fi Application · 2026 · DOI

  • Insufficient suppression of self-interference in STAR front ends - Limited isolation in prior dual-circularly polarized patch antennas - Need for a decoupling feeding network to enhance antenna-domain…

    A Dual-Circularly Polarized STAR Patch Antenna with Enhanced Transmit–Receive Isolation Using a Decoupling Feeding Network · 2026 · DOI

  • Investigation of the proposed antenna in other frequency bands. Experimental validation of the proposed antenna. Optimization of the antenna design for better performance.

    Quad-Band Truncated Square-Shaped MIMO Terahertz Antenna for Beyond 5G and 6G Communications · 2026 · DOI

  • The antenna's performance may be affected by bending, - The analysis is performed using a cylindrical bend with a '50 mm' radius, - The antenna's size is limited by the large operating…

    A Dual-Band Flexible MIMO Array Antenna for Sub-6 GHz 5G Communications · 2025 · DOI

  • Further research can be done to improve the antenna's performance in wearable applications, - Investigation of the antenna's behavior in different bending scenarios, - Optimization of the antenna's design for better…

    A Dual-Band Flexible MIMO Array Antenna for Sub-6 GHz 5G Communications · 2025 · DOI

  • Further research is needed to improve the antenna's performance, - Research on the antenna's application in different fields is needed, - Study on the antenna's scalability and integration with other devices is required, - Investigation on the antenna's robustness and reliability…

    A Wideband Eight-Port MIMO Antenna with Reduced Mutual Coupling for Future 5G mm-Wave Applications · 2025 · DOI

  • Conventional microstrip antennas suffer from limitations such as narrow bandwidth and low gain. Electronic voting machines face vulnerabilities related to identity verification and fraud.

    Design and Analysis of High Gain Slotted Circular Patch Antenna · 2026 · DOI

  • Investigating the use of other substrate materials and thicknesses. Modifying the antenna design to operate in other frequency ranges. Exploring the use of the proposed antenna in various wireless applications.

    Design of Compact Single Element Antenna for Wideband Communication Systems · 2026 · DOI

  • Investigating the antenna’s performance in a real-world scenario. Optimizing the antenna’s design for better performance. Exploring the use of the proposed antenna in other applications.

    Multiband Quasi-Yagi Antenna with Frequency-Selective Multi-Branch Directors for Sub-6 GHz Applications · 2026 · DOI

  • Investigating the effects of different types of dust and sand particles on the antenna performance. Developing more efficient feeding networks to optimize antenna performance.

    Metasurface-enabled high-gain circularly polarized antenna array for sensing in dust-laden environments · 2026 · DOI

  • Further research can be done to improve the reliability of the material used - Research can be conducted to explore the application of the proposed antenna in various…

    Shared Aperture Quad-Band Antenna Configuration for 5G Sub-6 GHz and Emerging Mid-Band Scenarios · 2026 · DOI

  • Further research on optimizing the antenna design for better performance, - Investigating the application of the proposed antenna in various 5G and beyond…

    Compact two-port MIMO antenna dual-circularly polarized 28/38 GHz with polarization diversity for 5G and beyond millimeter-wave systems · 2026 · DOI

Most-cited papers in Antenna Design and Analysis

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Open questions raised by papers listed on this page include: (1) There is a need for compact and efficient terahertz antenna designs (“Quad-Band Truncated Square-Shaped MIMO Terahertz Antenna for Beyond 5G and 6G…”, 2026); (2) This yields a tractable and physically consistent uplink signal model for a multi-PA pinching-antenna system (PASS), which has not been established for conventional PASS using a single long waveguide (“Uplink and Downlink Communications in Segmented Waveguide-Enabled…”, 2026); (3) The lack of a simple and efficient solution for reconfigurable wireless applications (“Frequency band tunable antenna with parasitic element to switch between narrow…”, 2026); (4) There is a need for a novel decoupling unit to improve isolation (“Isolation enhancement in a compact 2.4 GHz antenna pair for radar systems”, 2026); (5) Existing antennas have limited performance due to the lack of effective radiation pattern engineering (“Interaction driven artificial magnetic conductor and defected ground structure…”, 2026). 97 gap statements have been mined from Antenna Design and Analysis papers in our 4.5M-paper local library, which holds 792 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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