Special Issue "Latest Trend in Microwave Filters and Antennas for B5G Wireless Networks"
Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 2044
Interests: detection system; network security; intrusion detection system; machine learning
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Topics: Wireless Communications and Edge Computing in 6G
Interests: reconfigurable/switchable microwave filters; free space optical networks; spread spectrum communication
Interests: antennas; filters; lenses
Special Issues, Collections and Topics in MDPI journals
5G is enjoying an unprecedented development, with the user base set to grow to 500 million by 2023. 3G and 4G took nine and six years to achieve the same growth rate, respectively. The year 2019 has been the first year of 5G-scaled commercial adoption, with more than 60 5G commercial networks projected to be globally deployed. Recently, 19 telecom carriers in 11 countries announced the launch of 5G services. Scaled commercial rollouts have already kicked off in the UK, the US, Japan, South Korea, and China. Global 5G spectrum auctioning also signifies rapid development. By 2021, more than 35 countries auctioned the 5G spectrum, with C Band in 22 countries, mmWave in 8, the 2.6 GHz band in 5, and the 700 MHz band in 4. If it had not been for COVID-19, the prediction that 5G spectrum would be auctioned in over 100 countries should already have been completed by the end of 2022.
This is the right time not only to highlight, but also to ignite the research for microwave devices such as filters and antennas. We have already seen an increasing demand in recent years for 5G-ready and beyond 5G (B5G) emerging applications. Moreover, the requirement of such advancements cannot be understated for parallel but related applications such as software defined radios and radar systems. The exploration of new frequency spectrums reactivated the research on microwave filters and specifically the switch-ability and reconfigurable devices. Thus far, many effective techniques have been successfully developed to optimize microwave devices size and to transform the simple antenna or filter structure to a multi-band/tunable/reconfigurable and multifunction RF/microwave filtering devices without additional components. Low cost, simplicity, minimal occupied area, and performance are all desired characteristics of these antennas and filters in addition to multi-band functionality; however, this is not enough for B5G applications where speed, accuracy and cost-effectiveness are the keys.
At a device level, many matching structure models, including as open-circuited stubs, high-low impedance, parallel coupled, and end coupled structures, have been investigated to meet the desired frequency response of filters and antennas. Despite this, many techniques have ensured that good outcomes are still elusive. Depending on the applications, critical factors like power handling, nonlinear noise, switching speed and quality factors over the covered range are considered to the crucial factors, due to which sophisticated structures are the need of the time. Within this trend, the integrations of different microwave devices is also one of the key areas of research. The main benefits of such devices are compact size, efficient implementation using different high frequency components, along with co-simulations of different devices. Despite the current evolution in this field, challenges related to lack of accuracy, dependability, user ease and challenges in data analysis and interpretation have limited their wide-scale application. Therefore, it is necessary to develop a new, reliable, and user-friendly approach in facing these problems.
This Special Issues of Sensors is specifically focused on recent trends and applications aimed to provide the readers with the information of recent developments and new design and techniques for the development of reconfigurable/switchable/tunable, and last but not the least, standalone microwave filters.
We look forward to receiving your contributions.
Prof. Dr. Vijayakumar Varadarajan
Dr. Salman Arain
Dr. Muhammad Ali Babar Abbasi
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- reconfigurable/switchable microwave filters
- antennas lenses
- B5G networks
- 5G Communication