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Applied Sciences
Special Issues
Antenna System: From Methods to Applications
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Antenna System: From Methods to Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 1325

Special Issue Editor

Prof. Dr. Hosung Choo

E-Mail Website
Guest Editor
School of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Republic of Korea
Interests: electrically small antennas for wireless communications; reader and tag antennas for RFID; on-glass and conformal antennas for vehicles and aircraft; array antennas for GPS applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Until recently, substantial effort has been devoted to new approaches and attempts to design antennas for microwave and millimeter-wave applications. For example, advanced technologies such as antenna miniaturization, array optimization, and bandwidth enhancement have been extensively studied over the past decade, and are being applied to commercial applications such as 4G/5G mobile communications, autonomous driving, or military applications including radar, direction finding, and anti-jamming.

However, as these technologies are recently employed in small mobile devices, the size and geometry of the antennas are more limited in order to be mounted in a more compact space with better radiation performance. Accordingly, advanced antenna designs using novel approaches are required that cover various aspects of this issue.

This Special Issue aims to collect relevant papers describing the latest advances and prospects in antenna design for microwave and millimeter-wave applications.

The fields of interest for this Special Issue include, but are not limited to, methods for the design of antennas, such as miniaturization, optimization, and array antennas. You are cordially invited to submit a contribution of either an original research or a review article to this Special Issue.

Prof. Dr. Hosung Choo
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 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. Applied Sciences 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

  • antenna system design and optimization
  • antenna arrays
  • 5G/6G communications
  • antenna measurement
  • manufacturing methods
  • miniaturized microwave and millimeter-wave antennas
  • automotive antennas
  • radar antennas

Published Papers (2 papers)

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Research

16 pages, 8217 KiB  
Article
A Compact, Low-Profile, Broadband Quasi-Isotropic Antenna for Non-Line-of-Sight Communications
by Sonapreetha Mohan Radha, Mee-Su Lee, Seong Hoon Choi and Ick-Jae Yoon
Appl. Sci. 2024, 14(5), 2068; https://doi.org/10.3390/app14052068 - 1 Mar 2024
Viewed by 550
Abstract
A single-feed broadband quasi-isotropic antenna was designed for non-line-of-sight (NLOS) wireless sensor networks. The proposed antenna is based on a combination of fork-shaped crossed dipoles. It shows the broadband of quasi-isotropic radiation characteristics with high radiation efficiency. The electrical size ka of the [...] Read more.
A single-feed broadband quasi-isotropic antenna was designed for non-line-of-sight (NLOS) wireless sensor networks. The proposed antenna is based on a combination of fork-shaped crossed dipoles. It shows the broadband of quasi-isotropic radiation characteristics with high radiation efficiency. The electrical size ka of the proposed antenna is 0.94 with respect to its lower operating frequency. Its profile is also extremely thin at 0.0015λ. The impedance is matched from 1.8 to 4.3 GHz, or an 81.9% fractional bandwidth, whereas the maximum gain deviation ranging from 6.2 to 9.2 dB for the quasi-isotropic radiation is achieved from 1.8 to 3.6 GHz with a 10 dB criterion, which is close to the impedance bandwidth. The performance from the computed expectations is verified, as it shows a gain deviation of 8.4–9.8 dB from 1.9 to 3.3 GHz with an 80% fractional impedance bandwidth. The proposed antenna also shows good spatial coverage of circular polarization at high frequencies. Lastly, the received power level performance of the proposed antenna is tested under the NLOS condition, which shows a higher level compared to the linearly polarized, broadband omni-directional monopole antenna. Full article
(This article belongs to the Special Issue Antenna System: From Methods to Applications)
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9 pages, 2518 KiB  
Communication
Design of a Stacked Dual-Patch Antenna with 3D Printed Thick Quasi-Air Substrates and a Cavity Wall for Wideband Applications
by Doyoung Jang, Jun-Yong Lee and Hosung Choo
Appl. Sci. 2024, 14(4), 1571; https://doi.org/10.3390/app14041571 - 16 Feb 2024
Viewed by 593
Abstract
In this paper, we propose a stacked dual-patch antenna with 3D printed thick quasi-air substrates and a cavity wall for wideband applications. To achieve the theoretical maximum bandwidth of the patch antenna, the quality factor of the system needs to be minimized. To [...] Read more.
In this paper, we propose a stacked dual-patch antenna with 3D printed thick quasi-air substrates and a cavity wall for wideband applications. To achieve the theoretical maximum bandwidth of the patch antenna, the quality factor of the system needs to be minimized. To achieve this, the area of the conductive radiator should be enlarged, while the permittivity of the substrate within the patch must be reduced close to 1. To realize a patch antenna with this maximum bandwidth, the stacked dual-patch configuration is employed to obtain an extended conductive radiator area. In addition, square-pipe resin frames manufactured using a 3D printing method are applied to the proposed antenna to implement a quasi-air substrate structure that has a low permittivity value close to 1. The proposed stacked dual-patch antenna with a quasi-air substrate has a broad bandwidth of 20.7%. The results demonstrate that by using the proposed antenna structure, broadband characteristics close to the fundamental bandwidth limit of the patch antenna can be achieved. Full article
(This article belongs to the Special Issue Antenna System: From Methods to Applications)
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