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Electronics
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Analog/RF Circuits: Latest Advances and Prospects
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Analog/RF Circuits: Latest Advances and Prospects

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Circuit and Signal Processing".

Deadline for manuscript submissions: closed (15 November 2025) | Viewed by 3681

Special Issue Editors

Dr. Jiankang Xiao

E-Mail Website
Guest Editor
School of Electro-mechanical Engineering, Xidian University, Xi’an 710071, China
Interests: RF components and wireless communication technology
Dr. Wei Zhao

E-Mail Website
Guest Editor
School of Electro-Mechanical Engineering, Xidian University, Xi’an 710071, China
Interests: microwave measurement technology

Special Issue Information

Dear Colleagues,

Analog and RF circuits have very important applications in (1) communication systems, including mobile communication, satellite communication and wireless sensor network systems; (2) consumer electronics systems such as smartphones, tablets, audio equipment and smart home; (3) industrial and medical fields; (4) energy and environment monitoring, etc. With the rapid development of communications and wireless technologies, many new analog and RF circuit designs are being developed. This Special Issue aims to encourage potential contributors to explore and share their original research works pertaining to these subjects. We invite prospective authors to contribute their recent research works for consideration, especially in the following topics:

  • RF filtering components and filtering integrated circuits;
  • RF antennas;
  • Other RF components and systems;
  • Wireless monitoring systems;
  • Consumer electronics systems;
  • Test and measurement techniques.

Dr. Jiankang Xiao
Dr. Wei Zhao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Electronics is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • RF components and systems
  • antennas
  • wearable circuits and systems
  • wireless monitoring systems
  • microwave measurement technique

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Published Papers (3 papers)

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Research

15 pages, 7899 KB  
Article
Digital Pulse-Width and Pulse-Density Modulator Based on Binary Counting
by Vítor Viegas
Electronics 2025, 14(22), 4516; https://doi.org/10.3390/electronics14224516 - 19 Nov 2025
Viewed by 284
Abstract
This study presents a digitally controlled, combined pulse-width and pulse-density modulator (PWDM) that leverages the inherent pulse-width modulation associated with natural binary counting. The proposed approach involves combining the individual bit-counting pulses to synthesize a modulated signal where the mean voltage is directly [...] Read more.
This study presents a digitally controlled, combined pulse-width and pulse-density modulator (PWDM) that leverages the inherent pulse-width modulation associated with natural binary counting. The proposed approach involves combining the individual bit-counting pulses to synthesize a modulated signal where the mean voltage is directly proportional to the input digital code. A circuit design, based on general-purpose components, is proposed for an 8-bit digital-to-analog converter. The architectural concept is scalable, supporting resolutions that can accommodate any number of bits. The paper describes the simulations conducted to verify the proper functioning of the circuit and to evaluate its performance. Tests were performed to determine the static characteristic of the converter, measure its nonlinearity, and observe its step response. The circuit combines the benefits of both PWMs and PDMs, offering a blend of energy efficiency with simplicity and better smoothing. Full article
(This article belongs to the Special Issue Analog/RF Circuits: Latest Advances and Prospects)
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19 pages, 5645 KB  
Article
Low-Backward Radiation Circular Polarization RFID Reader Antenna Design for Sports-Event Applications
by Chia-Hung Chang, Ting-An Chang, Ming-Zhang Kuo, Tung-Ming Koo, Chung-I G. Hsu and Xinhua Wang
Electronics 2025, 14(18), 3582; https://doi.org/10.3390/electronics14183582 - 9 Sep 2025
Viewed by 1011
Abstract
This paper presents the design of a circularly polarized RFID ground mat antenna for UHF-band sports-event applications. Considering a practical sports-event timing system, the ground-based mat antenna with characteristics of a low-backward radiation and circular polarization is proposed. A multilayer square patch antenna [...] Read more.
This paper presents the design of a circularly polarized RFID ground mat antenna for UHF-band sports-event applications. Considering a practical sports-event timing system, the ground-based mat antenna with characteristics of a low-backward radiation and circular polarization is proposed. A multilayer square patch antenna using an acrylic dielectric substrate with a wideband branch-line coupler feeding network is employed to improve overall radiation efficiency, which, in turn, provides two excitation port with a phase difference of 90°. Thus, right-hand circular polarization can be obtained. Instead of a conventional FR4–air–FR4 structure, the proposed FR4–acrylic–FR4 composite configuration is adopted to substantially increase the antenna’s mechanical strength and durability against external pressure from runners. The antenna’s performance is attributed to the use of an effective composite dielectric constant and an optimized design of its parameters. Additionally, the patch antenna’s low-backward radiation characteristic helps reduce multipath interference in real-world applications. The measured results are in good agreement with the simulated data, validating the proposed antenna design. In order to further assess the practical performance of the antenna, outdoor measurements are carried out to validate the estimated reading distances derived from controlled anechoic chamber tests. The measured return loss remained below −10 dB across the frequency range of 755–990 MHz, exhibiting a slight discrepancy compared to the simulated bandwidth of 800–1030 MHz. For the characteristic of the circular polarization, the measured axial ratio is below 3 dB within the range of 860–920 MHz. While a more relaxed criterion of an axial ratio below 6 dB is considered, the operating frequency range extends from 560 MHz to 985 MHz, which falls within the frequency band relevant for RFID reader applications. Full article
(This article belongs to the Special Issue Analog/RF Circuits: Latest Advances and Prospects)
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12 pages, 4100 KB  
Article
Dual-Band Gysel Filtering Power Divider with a Frequency Transform Resonator and Microstrip/Slotline Phase Inverter
by Yongping Xu, Chaoyi Sun, Zhe Chen, Huayan Sun, Zeyu Huang, Runfeng Tang, Jinxiao Yang and Weilin Li
Electronics 2025, 14(1), 61; https://doi.org/10.3390/electronics14010061 - 26 Dec 2024
Cited by 2 | Viewed by 1241
Abstract
This paper presents a novel dual-band Gysel filtering power divider (FPD) with an excellent isolation performance and a significantly wide isolation bandwidth. Although Gysel power dividers have been extensively studied in the field of radio frequency (RF), the integration of filtering functionality and [...] Read more.
This paper presents a novel dual-band Gysel filtering power divider (FPD) with an excellent isolation performance and a significantly wide isolation bandwidth. Although Gysel power dividers have been extensively studied in the field of radio frequency (RF), the integration of filtering functionality and the expansion of isolation bandwidth remain challenging. The proposed design addresses these challenges by incorporating frequency transform resonators (FTRs) and a microstrip/slotline (M/S) phase inverter into the classic Gysel topology. The FTR is directly connected to the output port to provide a dual-band response, enabling the Gysel FPD to operate without external coupling between the resonator and the port. The M/S phase inverter is a dual-layer 180° phase shifter, designed to replace the conventional 180° transmission lines loaded between the two isolation resistors of the Gysel FPD, achieving a wide isolation bandwidth. To validate the proposed design method, a dual-band Gysel FPD with center frequencies of 1.4 GHz and 1.7 GHz is designed, fabricated, and measured. The measured results show that the in-band return loss is greater than 20 dB, and the in-band insertion loss is about 0.6 dB, and the amplitude and phase imbalance characteristics are good. In addition, the 20 dB-isolation fractional bandwidth achieves 97% (0.78–2.25 GHz). The measured results show excellent agreement with the simulation results, validating the effectiveness of the proposed design methodology. Full article
(This article belongs to the Special Issue Analog/RF Circuits: Latest Advances and Prospects)
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