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

Combined Single-Layer K-Band Transmitarray and Beamforming S-Band Antenna Array for Satcom
August 31 2022 Daniel Edelgaard Serup, Gert Frolund Pedersen and Shuai Zhang propose a shared aperture dual-band transmitarray and patch antenna for S- and K-band with beamforming capabilities. The obtained measurements show that the designed antenna achieves impedance bandwidths of 350 MHz and 3 GHz, and realized gains of 14.31 dBi and 22.64 dBi, at 4.5 GHz and 25. GHz, respectively. Additionally, the prototype antenna is shown to only have a 0.22 dB gain drop-off in a 60-degree beam scanning range. The design and unique features of the presented antenna make it interesting for many new and different use- cases and applications including satellite communication.
Bandwidth Enhancement of Millimeter-Wave Large-Scale Antenna Arrays Using X-type Full-Corporate Waveguide Feed Networks
August 31 2022 Fanqi Sun, Yujian Li, Junhong Wang, Lei Ge, Jianxin Chen and Wei Qin investigate a one-time-reflection equivalent model of the full-corporate waveguide feed networks towards proposing a novel approach to bandwidth enhancement of millimeter-wave large-scale antenna arrays. Theoretical analysis reveals that the in-phase superposition phenomenon of multiple small reflections at specific frequencies caused by the topology of the feed network is also a significant factor to affect the achievable bandwidth of the large-scale arrays. Based on the analysis, novel 60-GHz 3D printed horn arrays composed of wideband sub-arrays and air-filled X-junctions are designed. Taking advantage of the simple geometry that can be printed in a whole piece, the improved bandwidth, and the promising radiation characteristics, the presented design method and antenna array are attractive for advanced millimeter-wave wideband communications applications.
Mutual Decoupling for Massive MIMO Antenna Arrays by Using Triple-Layer Meta-Surface
August 31 2022 Shengyuan Luo, Yiming Zhang , Gert Frolund Pedersen and Shuai Zhang introduce a new decoupling method for massive MIMO arrays with an inner-element distance of around half wavelength by using a triple-layer metasurface (TMS). A massive MIMO array consisting of 4×4 elements is designed, simulated, and fabricated. The simulated and measured results show that the coupling of the array is reduced from -18 dB to -24 dB by using TMS. Thanks to specific features such as compact size and high isolation, the massive MIMO array integrated with the proposed TMS can be applied to satellite communications, 5G communication systems, synthetic aperture radars, and so on.
A 5G Enabled Shared-Aperture, Dual-Band, in-Rim Antenna System for Wireless Handsets
August 29 2022 Reza Shamsaee Malfajani, Farhad Bin Ashraf and Mohammad S. Sharawi present a shared aperture (SA), dual-band in metal-rim antenna system targeting the sub-6GHz and millimeter-wave (mm-wave) bands of the 5G wireless standard. The proposed design provides more than 140 MHz of frequency bandwidth in the sub-6 GHz band, and more than 3.5 GHz of bandwidth in the 28 GHz band. Excellent efficiency, exceeding 75%, was achieved for all antennas within all bands.
Bidirectional Leaky-Wave Antenna Based on Dielectric Image Line for Remote Vital Sign Detection at mm-Wave Frequencies
August 25 2022 Solomon Mingle, Despoina Kampouridou and Alexandros Feresidis propose a bidirectional leaky wave antenna with beam scanning capabilities based on the dielectric image line for single-tone continuous-wave Doppler radar for remote vital sign monitoring in a dynamic environment. The measured and simulated results agree well, and the antennas are successfully used to detect respiration and heartbeat at radial distances between 0.5 and 1.5 metres and at angular positions between −43◦ and +27◦ to the subject’s body. The proposed design method could be particularly useful for producing low-cost, high-gain, longer-range antennas at even higher mm-wave frequencies.
A New Arraying Technique for Band-Switchable and Polarization-Reconfigurable Antenna Arrays with Wide Bandwidth
August 25 2022 Junyi Huang, Mahmoud Shirazi and Xun Gong propose a novel arraying technique for polarization-reconfigurable array applications. Each array element has one feeding port only. All three polarization states can be dynamically reconfigured by providing proper phases at each antenna port. This new arraying technique is demonstrated inside two reconfigurable wideband (4:1 frequency ratio) arrays since wide-band multifunctional antenna arrays are the future.
Indigenously Developed HD Video Transmission System for UAVs Employing a 3 × 3 MIMO Antenna System
August 16 2022 Zubair Akhter, Rana M. Bilal, Kuat Telegenov, Eric Feron and Atif Shamim propose a real-time HD video transmission system (VTS) with a multiple-input multiple-output (MIMO) antenna configuration and state-of-the-art coverage is proposed for security and inspection applications. The proposed VTS employs ultrathin, lightweight antennas that are suitable for seamless integration with a UAV’s body without any protrusion. The maximum and average data rates for various distances are reported. The proposed VTS is capable of transmitting real-time HD video up to a 3.56-km distance with a receiver sensitivity of −76 dBm. The maximum achieved data rates at a 500-m distance are ∼10 and ∼43 Mbps for operation in the 2.4- and 5.2-GHz frequency bands, respectively.