RFID and Applications of RF/Microwave Circuits and Systems

A Special Issue of Designs (ISSN 2411-9660) belonging to the section "Smart Manufacturing System Design".

Deadline for manuscript submissions: 31 January 2027 | Viewed by 2194

Editor


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Guest Editor
School of Engineering, University of Greenwich, Chatham, Kent ME4 4TB, UK
Interests: 5G/6G; antennas; AI; microwave devices; RF energy harvesting; IoT; wireless systems
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Special Issue Information

Dear Colleagues,

Radiofrequency identification (RFID) and wireless identification systems represent transformative technologies with broad and growing applications across various industries. These systems are pivotal in enabling smart connectivity for objects, environments, and even individuals. Their applications range from the tracking, sensing, and monitoring of tagged items and human bodies to advancements in sectors such as healthcare, logistics, security, and smart environments.

In particular, RFID systems rely heavily on the design of radiofrequency (RF) circuits and components in order to operate successfully. RF, which spans from 300 MHz to 300 GHz, includes microwave and millimeter-wave frequencies. RF circuits play a key role in the efficient functioning of RFID systems and are foundational for applications like wireless sensors, smart healthcare solutions, and localization systems.

This Special Issue aims to explore the interdisciplinary design and engineering challenges facing RFID systems, with a particular focus on how RF and microwave circuits and devices are integrated into real-world applications. Topics of interest include, but are not limited to, the following:

  • Smart connectivity and IoT integration;
  • Wireless identification and localization systems;
  • Indoor and outdoor sensing technologies;
  • RFID system design and data fusion techniques;
  • Smart healthcare systems and wearable technologies;
  • Neural networks and intelligent design systems for RFID applications;
  • Nonlinear RF and microwave circuit design;
  • The design and optimization of RF and microwave devices and circuits;
  • The applications of compressive sensing theory in RFID systems;
  • Energy-efficient and scalable RFID solutions.

Dr. Augustine O. Nwajana
Guest Editor

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Keywords

  • radiofrequency identification (RFID)
  • wireless sensors and system design
  • smart healthcare and wearables
  • RFID data fusion and processing
  • RF and microwave circuits and devices
  • localization and tracking systems
  • neural networks in system design
  • nonlinear circuit design for RFID

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Published Papers (2 papers)

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Research

12 pages, 2221 KB  
Article
Development of a Microstrip Triplexer with High Isolation for 5G Sub-6 GHz Applications
by Bhaskarareddy Nallagutlapalli Chandrashekarareddy, Rashmi Ravi and Augustine O. Nwajana
Designs 2026, 10(4), 84; https://doi.org/10.3390/designs10040084 - 9 Aug 2026
Viewed by 543
Abstract
The rapid proliferation of multi-standard fifth-generation (5G) new radio sub-6 GHz systems has intensified the demand for compact, high-isolation multiplexing components capable of simultaneously routing multiple frequency channels through a single shared antenna port without cross-band interference. This article presents the design and [...] Read more.
The rapid proliferation of multi-standard fifth-generation (5G) new radio sub-6 GHz systems has intensified the demand for compact, high-isolation multiplexing components capable of simultaneously routing multiple frequency channels through a single shared antenna port without cross-band interference. This article presents the design and full-wave electromagnetic (EM) simulation of a compact microstrip triplexer operating at 2.2, 2.6, and 3.0 GHz for 5G sub-6 GHz applications. The proposed triplexer employs square open-loop resonators (SOLRs) arranged as three independent three-pole Chebyshev bandpass filter channels. Each channel is synthesized from a standard normalized Chebyshev lowpass filter prototype. The three channels are integrated at a common input port via a T-junction, with the connecting transmission line stubs dimensioned to enforce high inter-channel isolation. The triplexer is implemented on Rogers RT/Duroid 6010LM substrate. Full-wave EM simulation results demonstrate return losses of 21.1, 23.1, and 22.8 dB; insertion losses of 1.08, 1.01, and 0.98 dB; and inter-channel isolations of 45.7, 45.2, and 45.7 dB for ports S32, S42, and S43, respectively. The achieved inter-channel isolation exceeding 45 dB represents a significant improvement over the majority of recently reported microstrip triplexers operating in the sub-6 GHz range. The device occupies a compact circuit area of 0.34λg × 0.52λg. λg is the guided wavelength for the microstrip line impedance at the 2.6 GHz centre frequency of the triplexer. Full article
(This article belongs to the Special Issue RFID and Applications of RF/Microwave Circuits and Systems)
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27 pages, 6405 KB  
Article
System Design of a Low-Power BLE Smart Label SoC with Dynamic E-Paper for QR Rendering and Temperature Sensing
by Luis Miguel Pires, Ruben Azevedo and Filipa Pires
Designs 2026, 10(3), 65; https://doi.org/10.3390/designs10030065 - 22 Jun 2026
Viewed by 827
Abstract
Smart labels are emerging as a key enabling technology for product traceability, environmental monitoring, and user interaction within Internet of Things (IoT) ecosystems. This work presents the design and experimental validation of a low-power smart label platform integrating Bluetooth Low Energy (BLE) communication, [...] Read more.
Smart labels are emerging as a key enabling technology for product traceability, environmental monitoring, and user interaction within Internet of Things (IoT) ecosystems. This work presents the design and experimental validation of a low-power smart label platform integrating Bluetooth Low Energy (BLE) communication, temperature sensing, and dynamic e-paper visualization based on the HY0020 System-on-Chip (SoC). This platform was implemented on a custom Printed Circuit Board (PCB) designed around a 1.02-inch monochrome e-paper display and incorporates a TXS0108E interface to support reliable display communication. The developed prototype enables wireless user interaction, dynamic QR code rendering, and ambient temperature monitoring while maintaining low average power consumption. Experimental evaluation included BLE communication testing, display operation validation, temperature monitoring assessment using the integrated HY0020 sensor, and energy consumption characterization. Experimental results confirmed reliable BLE connectivity, stable temperature monitoring performance under normal environmental conditions, and an estimated battery lifetime of approximately 54 days under the evaluated operating profile. The presented platform demonstrates the feasibility of integrating sensing, wireless communication, and electrophoretic display technology within a compact battery-powered smart label device. The proposed architecture provides a practical proof-of-concept foundation for future applications involving product traceability, digital information management, and Digital Product Passport (DPP)-oriented services. Full article
(This article belongs to the Special Issue RFID and Applications of RF/Microwave Circuits and Systems)
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