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Open research questions in Antenna Design and Analysis

71 unresolved questions extracted from the limitations and future-work sections of 264 Antenna Design and Analysis papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The need for compact and low mutual coupling MIMO antenna designs for 5G millimeter-wave applications. The challenge of creating many antenna elements that are tiny, effective, and have low mutual coupling for integrating MIMO systems into small devices.

    Compact and low mutual coupling 4 × 4 wideband MIMO antenna design for 5G millimeter-wave applications · 2026 · 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

  • Switching speed and fabrication complexity remain limiting factors for RF-MEMS switches. Varactor diodes introduce harmonic distortion and reduced power handling capability. Mechanical reconfiguration is inherently slower and may involve increased structural complexity. The paper does not provide a comprehensive analysis of the limitations of reconfigurable antennas.

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

  • Large antenna arrays with several elements that manage parameters such as phase, amplitude, and isolation in MIMO systems need extensive research. AI/ML can be useful in this endeavor due to the large number of parameters involved. The use of cognitive radio techniques can be helpful in ensuring that the antenna operates optimally in any environment.

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

  • The limitation of the Chu lower bound on quality factor for the fractional input-impedance voltage-standing-wave-ratio (VSWR) bandwidth of an antenna. The need for a robust field-based quality factor Q that equals the impedance quality factor QZ.

    Combining Bode-Fano and dispersive tuning to increase antenna bandwidth [Invited] · 2026 · DOI

  • Traditional patch antennas have limitations such as narrow bandwidth and low gain. The advent of 5G communication technology requires higher bandwidth and gain.

    A Diamond-type Broadband Microstrip Patch Antenna with a Folded Floor · 2024 · DOI

  • To develop a NEP simulator or implementation. To provide a program written in Java which is capable of simulating almost any NEP. To fill the gap in the literature for a NEP simulator or implementation.

    Development of a Dual-Band Microstrip Patch Antenna with Rectangular Slot for Next-Generation 12-35 THz Applications · 2024 · DOI

  • To develop new NEP simulators or implementations. To improve the performance of jNEP. To apply jNEP to other areas of research.

    Development of a Dual-Band Microstrip Patch Antenna with Rectangular Slot for Next-Generation 12-35 THz Applications · 2024 · DOI

  • Conventional MPAs have a narrow impedance bandwidth of around 3%. There is a need for an antenna system that covers the 5G spectrum's awaited bandwidth.

    A compact dual-feed wide-band slotted antenna for future wireless applications · 2024 · DOI

  • The need for antennas that can work efficiently at different frequency bands, - The limitation of prior work in achieving multi-band operation

    Design of Multi-Band Microstrip Patch Antenna for Wi-Fi and WLAN Applications · 2026 · DOI

  • Conventional MIMO and massive MIMO cannot fully explore the spatial variation of wireless channels in a given receive area. The lack of a field-response based channel model for MA systems.

    Modeling and Performance Analysis for Movable Antenna Enabled Wireless Communications · 2023 · DOI

  • The paper identifies the need for higher capacity in future 6G and beyond wireless communication systems. The paper identifies the limitations of conventional MIMO systems in terms of energy consumption and hardware cost.

    MIMO Capacity Characterization for Movable Antenna Systems · 2023 · DOI

  • The unit cell element should provide a phase range in excess of 2π radians and should be characterized by low sensitivity to size and frequency changes. The existing unit cell designs have limitations in terms of phase range and sensitivity.

    Characterization of a Split Circle Element for Microstrip Reflectarrays · 2023 · DOI

  • Investigating the application of the proposed beam focusing scheme to other antenna architectures. Analyzing the computational complexity of the proposed solutions. Extending the proposed scheme to support multi-user MIMO communications in more complex scenarios.

    Beam Focusing for Near-Field Multiuser MIMO Communications · 2022 · DOI

  • The lack of efficient beam focusing schemes for near-field multi-user MIMO communications. The need for novel antenna architectures that can support near-field operation. The requirement for reliable high-rate communications in near-field regions.

    Beam Focusing for Near-Field Multiuser MIMO Communications · 2022 · DOI

  • To extend the proposed model to other types of array architectures. To investigate the performance of extremely large-scale array communication systems in the presence of noise and interference. To develop new optimization techniques for the design of extremely large-scale array communication systems.

    Communicating With Extremely Large-Scale Array/Surface: Unified Modeling and Performance Analysis · 2021 · DOI

  • The conventional UPW modeling is no longer valid for extremely large-scale arrays. There is a need for a new mathematical model that accurately takes into account the variations of signal phase, amplitude, and projected aperture across array elements.

    Communicating With Extremely Large-Scale Array/Surface: Unified Modeling and Performance Analysis · 2021 · DOI

  • The demand for designing new antennas that can fulfill the user's demands in Sub-6 GHz 5G bands. The need for compact and efficient antennas that can provide reliable coverage and substantial capacity.

    4 Element compact triple band MIMO antenna for sub-6 GHz 5G wireless applications · 2021 · DOI

  • The transition loss was taken into account when determining the measured antenna gain of the test structures. Due to transition loss variations, the antenna gain could be reliably determined up to 155 GHz because of the limited calibration. The stand-alone feed network was not characterized due to lack of 50-terminations for the array ports when measuring with a 2-port vector network analyzer (VNA).

    Patch Antenna and Antenna Array on Multilayer High-Frequency PCB for D-Band · 2020 · DOI

  • Further research on the optimization of the antenna design and feed network. Investigation of the use of PCB technology for other frequency bands. Development of scalable phased antenna arrays using PCB technology.

    Patch Antenna and Antenna Array on Multilayer High-Frequency PCB for D-Band · 2020 · DOI

  • The antenna becomes heavy and bulky due to the use of multi-layered structures. The gains obtained in these methods are limited to maximum 0.5 to 0.8 dB at resonant frequencies.

    Dual-band Bisected Psi Antenna for 3G, Wi-Fi, WLAN and Wi-MAX Applications · 2020 · DOI

  • The challenges faced while designing multi-band antennas are achieving broad bandwidth along with adequate gain and a stable radiation pattern. The gains obtained in these methods are limited to maximum 0.5 to 0.8 dB at resonant frequencies.

    Dual-band Bisected Psi Antenna for 3G, Wi-Fi, WLAN and Wi-MAX Applications · 2020 · DOI

  • Limited bandwidth of traditional ESAs. Suppressed radiation efficiency of traditional ESAs. Need for improved performance of ESAs.

    Electrically Small Microstrip Antenna Based on Magnetodielectric Materials · 2022 · DOI

  • The need for high gain, high bandwidth, and frequency reconfiguration antennas for wireless networks. The limitation of traditional antenna designs.

    High gain multiband and frequency reconfigurable metamaterial superstrate microstrip patch antenna for C/X/Ku-band wireless network applications · 2021 · DOI

  • Further study of the properties of antennas based on the spectral content of the signal. Development of new antenna array designs that can operate with broadband signals. Investigation of potential applications in control of the atmosphere and measuring its frequency-selective properties.

    Antenna Arrays Focused on Broadband Signals · 2016 · DOI

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71 open questions have been extracted from the limitations and future-work passages of 264 Antenna Design and Analysis papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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