ISSUE 1, 2022

AWE-Inspiring Electrically Small Antennas
Author: Richard W. Ziolkowski

Anytime-wireless-everywhere (AWE) aspirations for Internet-of-Things (IoT) applications to be enabled through current 5G and evolving 6G and beyond ecosystems necessitate the development of innovative electrically small antennas (ESAs). While a variety of ESA systems are reviewed, those realized from the near-field resonant parasitic (NFRP) antenna paradigm are emphasized. Efficiency, bandwidth and directivity issues are highlighted. Multifunctional, reconfigurable, passive and active systems that have been achieved are discussed and illustrated; their performance characteristics and advantages described. This overview finalizes by going back to the future and considers enterprising research areas of current and forward-looking interest.

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https://doi.org/10.53792/roe/2022.1/21006

The Water Drop Lens: Revisiting the Past to Shape the Future
Author: Nelson J. G. Fonseca

This vision paper provides a brief overview on recent developments related to a new solution of quasi-optical beamformer, referred to as the water drop lens. This parallel plate waveguide beamformer, which is a revisited geodesic lens with a shaped profile, is attracting attention for applications in the millimetre-wave range, where more conventional dielectric lenses prove to be too lossy and standard geodesic lenses are still too bulky. On-going investigations include satellite and terrestrial communication systems, radar systems and imaging systems with wideband operation at centre frequencies ranging from about 20 GHz to over 120 GHz.

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https://doi.org/10.53792/roe/2022.1/21008

Material-based high-impedance surfaces for infrared photonic technologies
Author: Íñigo Liberal and José Manuel Pérez-Escudero

Metamaterial high-impedance surfaces (HISs) are characterized by a boundary condition close to that of a perfect magnetic conductor (PMC). This property has enabled a variety of antenna systems such as low-profile antennas, electromagnetic absorbers and anti-radar systems. Here, we push forward the concept of material-based high-impedance surfaces (MatHISs), where a high-impedance boundary is directly obtained from the material properties of doped semiconductors and polar dielectrics at infrared frequencies. Technological advantages of MatHISs such as fabrication simplicity, large-area deployment and integrability into conformal devices suggest multiple applications for infrared photonic technologies, including dynamical thermal emitters, optoelectronic devices and basic research on atomically-thin materials.

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https://doi.org/10.53792/roe/2022.1/21010

Optomechanical Microwave Oscillators
Author: Laura Mercadé and Alejandro Martínez

Optomechanical interaction in optical dielectric cavities can be used to generate high-purity microwave tones, giving rise to optomechanical microwave oscillators. Here, we introduce the main properties of these devices, which can be implemented in photonic integrated chips, and envisage its deployment in the mid-term in microwave photonics applications.

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https://doi.org/10.53792/roe/2022.1/21009

Overview of the Near-Ground Propagation Mechanisms in Wireless Communication: Is the Norton Surface Wave Significant?

Author:  Krzysztof A. Michalski and Juan R. Mosig

In this paper we re-examine the solution of the century-old Sommerfeld problem of a vertical Hertzian dipole radiating over planar ground, in the context of high-frequency applications, where the media losses are relatively small. To gain more insight into the near-ground wireless propagation mechanisms, we derive the asymptotic field of a dipole above a half-space by the modified saddle-point method carried out to the second order in the inverse radial distance, paying particular attention to the Norton surface wave and its significance in the total field of the dipole. We illustrate and validate the theoretical developments by numerical results involving various transmitter-receiver configurations of interest and different lower half-space media, including seawater and urban ground. We also briefly review the history of this problem and the most pertinent literature, addressing certain lingering controversies and correcting some recent misconceptions.

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https://doi.org/10.53792/roe/2022.1/21011

2022 IEEE APS Field Award Winners

Author:   The IEEE Antennas and Propagation Society

The 2022 IEEE AP-S awards are six awards given by the IEEE APS Society in 2022.

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https://doi.org/10.53792/roe/2022.1/2100A