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Micromachines
Special Issues
Novel Developments in Waveguides and Antennas
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Novel Developments in Waveguides and Antennas

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E：Engineering and Technology".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 3799

Special Issue Editors

Dr. Alina-Cristina Bunea

E-Mail Website
Guest Editor
National Institute for Research and Development in Microtechnologies Romania, 077190 Voluntari, Romania
Interests: microwave and millimeter wave devices and circuits; substrate integrated waveguides; planar antennas; membrane supported circuits; W-band receivers
Dr. Martino Aldrigo

E-Mail Website
Guest Editor
National Institute for Research and Development in Microtechnologies, IMT Bucharest, 077190 Voluntari, Romania
Interests: microwaves; nanoelectronics; passive and active microwave devices and circuit; energy harvesting techniques; carbon- and 2D material-based (nano)electronics; nanoscale ferroelectrics for high-frequency applications; metamaterials; antennas
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Dan Neculoiu

E-Mail Website
Guest Editor
1. Faculty of Electronics and Telecommunications, University POLITEHNICA of Bucharest, Bucharest, Romania
2. National Institute for Research and Development in Microtechnologies, IMT Bucharest, Bucharest, Romania
Interests: passive and active microwave devices and circuits; surface/bulk acoustic wave devices; linear and non-linear modeling techniques; microwave filters and antennas; carbon nanoelectronics

Special Issue Information

Dear Colleagues,

From the formulation of Maxwell’s equations in 1867 and the first practical transmitter/receiver implementation demonstrated by Marconi in 1894-1895, radio waves have become an essential component of everyday life. We can hardly imagine a world without wireless communications, be it in our mobile phones, our cars or our satellites and space probes. A critical component is the antenna, which ensures the interface between free-space and electronic systems. Antennas come in all shapes and sizes, from the huge radioastronomy antennas, which use parabolic reflectors measuring hundreds of meters in diameter, down to nanoantennas relying upon highly advanced fabrication technologies and materials. Miniaturization and integration of high-efficiency antennas are still bottlenecks in numerous applications such as wearable or implantable devices. Waveguides and waveguide-based components are the backbone of microwave and millimeter-wave systems and their development ranges from bulky metal waveguides to miniaturized substrate integrated waveguides used as standalone components or system integration platforms.

The current Special Issue aims to publish a collection of original research papers and review articles focused on the latest developments in antenna and waveguide technologies. New design and modeling approaches, fabrication methods and materials as well as characterization techniques are welcome. Contributions targeting the integration of functional 2D materials, multilayer technologies (e.g., BiCMOS, PCB, LTCC) as well as additive manufacturing are highly encouraged.

Dr. Alina-Cristina Bunea
Dr. Martino Aldrigo
Prof. Dr. Dan Neculoiu
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 communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Micromachines is an international peer-reviewed open access monthly 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 2600 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 and millimeter-wave antennas
  • THz antennas
  • planar antennas
  • antennas based on 2D materials
  • micromachined antennas/waveguides
  • metamaterials and metasurfaces
  • flexible antennas/waveguides
  • dielectric lens antennas
  • antennas/waveguides for wearable systems
  • 5G/6G technologies
  • beamforming and beam steering
  • substrate integrated waveguides
  • rectangular waveguides
  • dielectric waveguides
  • 3D printed antennas/waveguides

Published Papers (2 papers)

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Research

12 pages, 5833 KiB  
Article
Multilayer Smart Holographic Label with Integrated RFID for Product Security and Monitoring
by Cătălin Pârvulescu, Veronica Anăstăsoaie, Roxana Tomescu, Martino Aldrigo and Dana Cristea
Micromachines 2023, 14(3), 692; https://doi.org/10.3390/mi14030692 - 21 Mar 2023
Viewed by 1788
Abstract
Counterfeiting presents a major economic problem and an important risk for the public health and safety of individuals and countries. To make the counterfeiting process more difficult, and to ensure efficient authentication, a solution would be to attach anti-counterfeit labels that include a [...] Read more.
Counterfeiting presents a major economic problem and an important risk for the public health and safety of individuals and countries. To make the counterfeiting process more difficult, and to ensure efficient authentication, a solution would be to attach anti-counterfeit labels that include a radio frequency identification (RFID) element to the products. This can allow real-time quality check along the entire supply chain. In this paper we present the technology optimized to obtain a multilayer holographic label with a high degree of security, patterned on a thin zinc sulfide film of a semi-transparent holographic foil rather than on the standard substrate for diffractive optical elements (metallized foil). The label is applied onto the product surface or packaging for anti-counterfeit protection. The developed multilayer structure contains various elements such as: a holographic background, nanotext-type elements, holographic elements, and an RFID antenna. The employed semi-transparent holographic foil offers the RFID antenna the possibility to transmit the electromagnetic signal through the label and thus to maximize the antenna footprint, achieving up to 10 m reading distance, with a 6 cm × 6 cm label, much smaller than the commercial standard (minimum 10 cm × 10 cm). Full article
(This article belongs to the Special Issue Novel Developments in Waveguides and Antennas)
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7 pages, 3565 KiB  
Article
A Novel Wideband Transition from LTCC Laminated Waveguide to Air-Filled Rectangular Waveguide for W-band Applications
by Bin Yuan, Qing Du, Chengxiang Hao, Yan Zhao and Zhongjun Yu
Micromachines 2023, 14(1), 52; https://doi.org/10.3390/mi14010052 - 25 Dec 2022
Cited by 1 | Viewed by 1224
Abstract
In this paper, a novel wideband transition from a laminated waveguide (LWG) to an air-filled rectangular waveguide (RWG) is proposed for millimeter-wave integration solutions based on multilayer low-temperature co-fired ceramic (LTCC) technology. The integrated transition cavity is divided into several resonators by introducing [...] Read more.
In this paper, a novel wideband transition from a laminated waveguide (LWG) to an air-filled rectangular waveguide (RWG) is proposed for millimeter-wave integration solutions based on multilayer low-temperature co-fired ceramic (LTCC) technology. The integrated transition cavity is divided into several resonators by introducing five grounded via holes. Due to the magnetic wall existing in the symmetry plane, the equivalent circuit of the proposed transition can be simplified as a three-pole filter model to explain the working mechanism with wideband performance. A W-band integrated LWG-to-RWG transition is designed as an example using LTCC technology. Two back-to-back prototypes with different lengths are fabricated and measured. A measured 25.7% bandwidth from 76 GHz to 101 GHz can be achieved for return loss better than 14 dB. The average insertion loss of a single transition is about 0.5 dB. The compact structure and wideband performance give it potential in high-density millimeter-wave and terahertz packaging. Full article
(This article belongs to the Special Issue Novel Developments in Waveguides and Antennas)
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