Next-Generation Healthcare: Enabling Technologies for Emerging Bioelectromagnetics Applications

A comprehensive overview of enabling technologies opening new and unexplored opportunities in body area sensing and stimulation is provided. Emerging bioelectromagnetics applications that may readily benefit from such technologies, with the potential to ultimately transform healthcare, sports, consumer electronics, and beyond, are discussed. Challenges, opportunities, and future directions are also highlighted.

High-Gain Dual-Band Dual-Sense Circularly Polarized Spiral Series-Fed Patch Antenna

The paper demonstrates a single-layered dual-band circularly polarized 2D series-fed patch antenna. A theoretical framework is developed to facilitate an efficient design procedure. The antenna achieves an outstanding performance with operating bandwidths of 7% and 5%, realized gains of 21.5 and 22 dBic at 12 and 14 GHz bands, respectively, with a profile of only 0.03 free-space wavelength.

A Survey of Dense Multipath and Its Impact on Wireless Systems

Dense multipath component (DMC) has an important influence on the performance of communication systems. A survey of studies of DMC in terms of different mathematical representations, channel modeling and channel parameters’ estimation methods is provided, and a comprehensive review of the channel characteristics and impact of DMC on performance of communication, localization and sensing systems is presented.

Recent Articles

Large Horizontal Near-field Scanner based on a Non-tethered Unmanned Aerial Vehicle
May 9 2022 Lorenzo Ciorba, Giuseppe Virone, Fabio Paonessa, Marco Righero, Eloy De Lera Acedo, Stefania Matteoli, Edgar Colin Beltran, Pietro Bolli, Giorgio Giordanengo, Giuseppe Vecchi, Alessio Magro, Riccardo Chiello, Oscar A. Peverini and Giuseppe Addamo present a large near-field horizontal scanner that provides both magnitude and phase. Such a scanner is implemented using a non-tethered UAV to maintain flight flexibility, agility and short setup time. An inverse source Near Field Far-Field (NF-FF) transformation is applied to UAV measurements of an array with digital beamforming. The two tangential components of the electric field used as input in the NF-FF transformation are sampled on two different sets of points. The calibration of the digital beamformed array is performed on the transformed embedded element patterns.
Adaptive Beamforming with Continuous/Discrete Phase Shifters via Convex Relaxation
May 9 2022 Yinman Lee proposes various phase-only beamforming strategies, that can successfully adapt to the random interference-limited environment. Essentially, thanks to the advances in convex-optimization techniques, all the formulated problems can be solved efficiently to achieve different levels of performance and hardware complexity. Experimental results give valuable guidelines for the design and development of these phase-only adaptive beamformers and demonstrate the benefit the usage of adaptive beamformers for real-world applications.
A Novel Cross-Band Decoupled Shared-Aperture Base Station Antenna Array Unit for 5G Mobile Communications
May 6 2022 Yejun He, Wei Huang, Zhou He, Long Zhang, Xiaobing Gao and Zhi Zeng propose a novel compact, dual-polarized, dual-broadband shared-aperture antenna array unit consisting of a lower band (LB) element and 4 upper band (UB) elements underneath for 5G mobile communications. The simulated and measured results show that the antenna array unit has good impedance matching, high polarization isolation and cross-band isolation, stable radiation pattern and cross-band coupling suppression in the lower bands of 0.69 to 0.96 GHz and the upper bands of 1.7-2.7 GHz, thus the presented antenna array unit can be used as a dual-band shared-aperture base station antenna array for 5G mobile communications.
3D Printed Linearly Polarized X-Band Conical Horn Antenna and Lens
May 6 2022 Ian Goode and Carlos E. Saavedra demonstrate a low-cost method to 3D print and metalize circular waveguide components using polylactic acid and aluminum adhesive backed tape. A gradient index (GRIN) lens, an externally metalized thin-walled conical horn, and a WR90 rectangular to linearly polarized circular waveguide transition are simulated, fabricated, and measured. The horn and lens are both monolithic prints that are externally metallized to simplify the metallization process. The walls of the thin-wall horn are printed at a thickness such that the dielectric layer does not impact the performance of the horn while being robust enough to support external metallization.
Optically Transparent Antenna Arrays for the Next Generation of Mobile Networks
April 29 2022 Ryan B. Green, Kai Ding, Vitaliy Avrutin, Umit Ozgur and Erdem Topsakal report the first ever antenna array with >90% transparency that is intended for 5G networks for smart cities. This level of transparency is achieved by using Gallium-doped Zinc Oxides. The array designed and tested is for sub-6GHz 5G and operates at 5.8GHz. This seamless design allows such arrays to be integrated into windows of buildings within the smart city to provide consistent network coverage. The phased array has good gain and scanning characteristics. A discussion is also included regarding gain and beam steering capabilities in comparison to similar arrays made of conventional copper and RF substrates.
A 2.45-and 5.8-GHz Dual-Band Stacked Differential Rectenna With High Conversion Efficiency in Low Power Density Environment
April 28 2022Kento Saito, Eisuke Nishiyama and Ichihiko Toyoda propose a novel stacked dual-band differential rectenna. The proposed rectenna consists of two rectifying diodes and a dual-band array antenna with four 5.8-GHz patch antennas arrayed on a three-element 2.45-GHz array. The rectenna can easily realize large-scale rectenna arrays by simply connecting the ground conductors on the back, and is practically attractive for wireless power transfer in many IoT applications, especially in the low-power density applications.
Investigations of Heat Sink Property of a Novel Dual Linear Polarized Low Cross-Polarization X-Band Phased Array Antenna Employing Silicon RFICs-Based Beamforming Network
April 27 2022Rudraishwarya Banerjee, Satish Kumar Sharma, Jia-Chi Samuel Chieh and Raif Farkouh present a 4x2 wideband dual linear polarized phased array antenna comprised of 3D metal printed radiators, serving also as heat sink, for X-band frequency. The beamforming network (BFN) is comprised of commercial silicon Radio Frequency Integrated Circuit chips which have been integrated with the antenna aperture. The temperature reduction of 60°C is achieved with the heat sink structure when the temperature distribution of BFN with and without heat sink are compared for the 4x2 array. Good radiation patterns with low cross-polarization are obtained, while the peak broadside gain is varying between 14-11 dBi.