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Microwave
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Advances in Microwave Devices and Circuit Design
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Advances in Microwave Devices and Circuit Design

A special issue of Microwave (ISSN 3042-5697).

Deadline for manuscript submissions: 20 May 2026 | Viewed by 1100

Special Issue Editor

Dr. Saeedeh Lotfi

E-Mail Website
Guest Editor
Department of Materials and Technology, University of West Bohemia, Pilsen, Czech Republic
Interests: microstrip technology; microstrip design; lowpass filter; bandpass filter; microstrip power dividers; printed electronics; microstrip couplers

Special Issue Information

Dear Colleagues,

Microwave and microstrip technologies play a key role in modern communication and electronic systems by enabling high-speed data transmission, efficient signal processing, and compact high-performance circuits. The use of novel materials, advanced design, simulation techniques, innovative fabrication methods, and flexible substrates enhance their practical applications. This Special Issue aims to gather cutting-edge research on microwave and microstrip devices and circuits. Submissions focusing on innovative design and fabrication techniques, the use of novel materials, printed electronics, and flexible substrates are particularly welcome, although classical fabrication methods are also appreciated. Contributions may cover both theoretical studies and practical implementations, including measurement and validation.

Topics may include filters, couplers, power dividers, resonators, antennas, and other printed circuits. Topics on all radio-frequency applications may be covered, except for radar systems, which are beyond the scope of this Special Issue. We warmly invite researchers from academia and industry worldwide to contribute their latest findings to this Special Issue. Our goal is to showcase innovative work that pushes the boundaries of microwave and microstrip technologies.

Dr. Saeedeh Lotfi
Guest Editor

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. Microwave is an international peer-reviewed open access quarterly 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 1000 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

  • microwave devices
  • microstrip circuits
  • RF design and simulation
  • printed circuits
  • experimental validation

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

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Research

18 pages, 12661 KB  
Article
A New Design of MIMO Antenna with Dual-Band/Dual-Polarized Modified PIFAs for Future Handheld Devices
by Haleh Jahanbakhsh Basherlou, Naser Ojaroudi Parchin and Chan Hwang See
Microwave 2026, 2(2), 7; https://doi.org/10.3390/microwave2020007 - 25 Mar 2026
Viewed by 387
Abstract
This paper introduces a compact sub-6 GHz multiple-input multiple-output (MIMO) antenna array developed for 5G smartphone applications. The design employs eight planar inverted-F antenna (PIFA) elements arranged to realize dual-band and dual-polarized operation. The antenna achieves impedance bandwidths of 3.3–3.7 GHz (11.4%) and [...] Read more.
This paper introduces a compact sub-6 GHz multiple-input multiple-output (MIMO) antenna array developed for 5G smartphone applications. The design employs eight planar inverted-F antenna (PIFA) elements arranged to realize dual-band and dual-polarized operation. The antenna achieves impedance bandwidths of 3.3–3.7 GHz (11.4%) and 5.3–5.8 GHz (10%), covering key sub-6 GHz fifth-generation (5G) bands. To enhance diversity performance, the elements are distributed along the edges of the smartphone mainboard, enabling excitation of orthogonal polarization modes while maintaining an overall board size of 75 mm × 150 mm on an FR4 substrate. Even without the use of dedicated decoupling structures, the closely spaced antenna elements exhibit satisfactory isolation levels, varying between −12 dB and −22 dB across the operating bands. The antenna array achieves wide impedance bandwidths of approximately 400 MHz at 3.5 GHz and more than 500 MHz at 5.5 GHz, supporting high data-rate communication. In addition, the proposed system demonstrates very low correlation and active reflection, with envelope correlation coefficient (ECC) values below 0.002 and total active reflection coefficient (TARC) levels better than −20 dB. User interaction effects are also investigated, and the results confirm acceptable SAR levels and stable radiation behavior in the presence of the human body. Owing to its planar, dual-band/dual-polarization capability and compliance with safety requirements, the proposed antenna represents a promising practical solution for contemporary 5G handheld devices and future multi-band mobile platforms. Full article
(This article belongs to the Special Issue Advances in Microwave Devices and Circuit Design)
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17 pages, 13522 KB  
Article
Distance-Invariant Constant-Power DC-to-DC Wireless Power Transfer Using Nonlinear Resonance
by Abdullah Alothman, Andrew DeVries and Amir Mortazawi
Microwave 2026, 2(1), 5; https://doi.org/10.3390/microwave2010005 - 26 Feb 2026
Viewed by 389
Abstract
Wireless power transfer (WPT) systems are generally sensitive to variations in separation distance and coil alignment, which result in reduced power transfer efficiency and delivered power. Various approaches based on control system and active matching circuits have resulted in more complex implementations. This [...] Read more.
Wireless power transfer (WPT) systems are generally sensitive to variations in separation distance and coil alignment, which result in reduced power transfer efficiency and delivered power. Various approaches based on control system and active matching circuits have resulted in more complex implementations. This work, by contrast, presents a full DC–DC inductively coupled WPT system employing coupled nonlinear resonators to automatically adapt the system for variations in transfer coil separation and orientation, maintaining high transfer efficiency at a constant output power level. With entirely passive circuit components, the nonlinear resonators suppress the frequency-splitting phenomenon typical of WPT systems that leads to efficiency degradation. A class-EF power amplifier used in the transmitter experiences an approximately constant impedance, providing a constant output power while maintaining high efficiency. On the receive side, a class-E rectifier operates at a constant input power, achieving high overall efficiency without active control. An experimental demonstration delivers 5 W with a 6.12% power variation over a 1 to 9 cm distance variation and achieves a peak DC–DC efficiency of 71.6%. The response of the system to changes in coil separation is compared with a conventional linear WPT circuit, showing a constant-power and high-efficiency operation. Full article
(This article belongs to the Special Issue Advances in Microwave Devices and Circuit Design)
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