Editor's Comments

The Bright Future of Antennaseditorial_a1-3286758What can we say on the current status of antenna research? What areas are the hottest topics in literature and what about future trends and research axes? All of these questions will find answers in this issue of the magazine! The first contribution, in fact, is an invited review by Hao et al. [A1] on current and future trends in antenna research as obtained by an artificial intelligence-powered analysis. The authors start with a rich overview of machine learning-based approaches applied to research and research-trends analyses. Then the data considered in the study are analyzed in detail, with a clear description of the algorithms used and a review of the main keywords. The work then turns to trends analysis for the past, an analysis followed by a set of predictions for the future based on extrapolations from the model. Finally the work terminates with conclusions and final discussion reframing all presented results.This issue contains several other extremely interesting feature articles. The article by Brown and Rahmat-Samii [A2] analyzes the use of error vector magnitude (EVM) as a performance indicator in millimeter-wave communication systems. The contribution starts with a detailed bibliographic analysis followed by a review of phased arrays performance metrics. The article then delineates the main definitions and features of EVM systems, followed by a detailed analysis of the associated measurements. The last part of the contribution deals with EVM characterization, and the article closes with conclusions summarizing the work and foreseeing future contributions.The article by Sang et al. [A3] analyzes the design path for stretchable microstrip patch antennas. The article starts with a rich overview of the state-of-the-art in the field explaining the particular focus that this contribution will have. The article then proposes a design approach for this family of antennas, followed by assessments via simulation, fabrication, and a report on measurement validation. The article terminates by drawing its conclusions and summarizing the key points of the contribution.The article by Khan et al. [A4] focuses on the design of a miniaturized antenna for ground-penetrating radar applications. The contribution starts with a broad overview of similar designs in the past, then turns to a more detailed description of the design strategy for the new antenna. The effect of gain enhancement from the ground is then analyzed. The article then turns to a simulation analysis followed by a section describing the fabrication. Finally, the new design is applied to ground-penetrating radar settings and the contribution reports on the result of this validation.Last, but not least, the article by Rao et al. [A5] presents a design for a quad-band reflector antenna for ground communications. After an analysis of the literature on the topic, a comparison with previous designs is presented. Then, the article turns to the main topic of the contribution by describing the design of the new antenna. The feed assembly is analyzed, followed by the analysis of the quadruplexer. Finally, the antennaâ€™s performance is assessed and the article terminates with conclusions and plans for future application scenarios.Enjoy the reading!

Appendix: Related Articles

[A1] Y.-O. Cha, A. A. Ihalage, and Y. Hao, â€œAntennas and propagation research from large-scale unstructured data with machine learning: A review and predictions,â€ IEEE Antennas Propag. Mag., vol. 65, no. 5, pp. 10â€“24, Oct. 2023, doi: 10.1109/MAP.2023.3290385.

[A2] D. Brown and Y. Rahmat-Samii, â€œError vector magnitude as a performance standard for antennas in the millimeter-wave era: Part 1: Metric comparisons and measurement concepts,â€ IEEE Antennas Propag. Mag., vol. 65, no. 5, pp. 25â€“34, Oct. 2023, doi: 10.1109/MAP.2023.3272838.

[A3] L. Sang et al., â€œReconfigurable microstrip patch antennas on flexible substrates: A design method,â€ IEEE Antennas Propag. Mag., vol. 65, no. 5, pp. 35â€“45, Oct. 2023, doi: 10.1109/MAP.2023.3301387.

[A4] P. P. Shome, T. Khan, B. K. Kanaujia, A. A. Kishk, and Y. M. M. Antar, â€œUnidirective miniaturized ultrawideband antenna for sensing buried objects in handheld ground-penetrating radar systems: A design approach,â€ IEEE Antennas Propag. Mag., vol. 65, no. 5, pp. 46â€“55, Oct. 2023, doi: 10.1109/MAP.2022.3203311.

[A5] S. K. Rao, P. Venezia, J. R. Scupin, C. Lee-Yow, and S. LaMar, â€œQuadband petal reflector antenna for ground communications: Combining four frequency bands into one innovative and reliable design,â€ IEEE Antennas Propag. Mag., vol. 65, no. 5, pp. 56â€“66, Oct. 2023, doi: 10.1109/MAP.2022.3229572.

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