sensors-logo

Journal Browser

Journal Browser

Special Issue "Antennas and Propagation"

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Remote Sensors".

Deadline for manuscript submissions: 31 January 2021.

Special Issue Editors

Prof. Razvan D. Tamas
Website
Guest Editor
Constanta Maritime University, str. Mircea cel Batran nr. 104, 900664, Constanta, Romania
Prof. Dr. Alina Badescu
Website
Guest Editor
University Politehnica of Bucharest, str. Splaiul Independentei nr. 313, sector 6, Bucharest, Romania
Prof. Dr. Tudor Palade
Website
Guest Editor
Technical University of Cluj-Napoca, str. Memorandumului nr. 28, Cluj-Napoca, Romania
Prof. Dr. Florin Alexa

Guest Editor
Department of Communications, Politehnica University Timisoara, Timisoara, Romania
Interests: audio and image processing; signal processing; antennas; radiocommunications; wireless sensor and actuator networks; audio and video compression
Special Issues and Collections in MDPI journals
Prof. Dr. Ioan Nicolaescu
Website
Guest Editor
"Ferdinand I" Military Technical Academy, str. George Cosbuc nr. 39-49, Bucharest, Romania

Special Issue Information

Dear Colleagues,

The 2020 International Workshop on Antenna Technology (iWAT 2020) will be held on 25–28 February 2020 at Hotel InterContinental in Bucharest, Romania (http://iwat2020.org).

The International Workshop on Antenna Technology (iWAT) is an annual forum for the exchange of information on the progress of research and development in innovative antenna technology. It especially focuses on small antennas and applications of advanced and artificial materials to the antenna design. At iWAT, all the oral presentations are delivered by invited prominent researchers and professors. iWAT has a particular focus on posters by which authors have the opportunity to interact with leading researchers in their fields.

Authors of selected high-quality papers related to sensors and sensor networks from the conference will be invited to submit extended versions of their original papers (50% extensions of contents of the conference paper) and contributions under the following conference topics:

  • New directions and challenges in antenna design;
  • Innovative antenna technologies for space applications;
  • Metamaterial and metasurface antennas;
  • Advances in RFID antenna design and characterization;
  • Small antennas;
  • Evolution of MIMO antenna systems towards 5G;
  • Antennas for 5G;
  • Metamaterial absorbing materials for RCS reduction and EMC applications;
  • Antenna and RCS measurements.

In addition to the iWAT 2020 papers, other independent submissions are also welcome. The subject of these contributions should be in the area of Antennas and Propagation.

Prof. Dr. Razvan D. Tamas
Prof. Dr. Alina Badescu
Prof. Dr. Tudor Palade
Prof. Dr. Florin Alexa
Prof. Dr. Ioan Nicolaescu
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 papers will be 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. Sensors 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 2000 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

  • Small antennas
  • 5G antennas
  • MIMO antenna systems
  • Radar cross section measurements
  • Antenna measurements
  • Metamaterial antennas
  • Metasurfaces
  • RFID antennas
  • Antennas for space applications
  • RF absorbing materials

Published Papers (10 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

Jump to: Other

Open AccessArticle
Compact N-Band Tree-Shaped Multiplexer-Based Antenna Structures for 5G/IoT Mobile Devices
Sensors 2020, 20(21), 6366; https://doi.org/10.3390/s20216366 - 08 Nov 2020
Abstract
This paper presents a simple, compact and low-cost design method that allows one to obtain low-profile multi-band antennas for the overcrowded future generation networks, which are widely versatile and very heterogeneous in the K/Ka bands. The proposed antennas comprise n radiating monopoles, one [...] Read more.
This paper presents a simple, compact and low-cost design method that allows one to obtain low-profile multi-band antennas for the overcrowded future generation networks, which are widely versatile and very heterogeneous in the K/Ka bands. The proposed antennas comprise n radiating monopoles, one for each of the desired operating frequencies, along with a frequency selective feeding network fed at a single point. This concept enables a single antenna to be shared with different radio-frequency (RF) frontends, potentially saving space. Typically, with n-band structures the biggest challenge is to make them highly efficient and here this is assured by multiplexing the frequency, and thus isolating each of the monopoles, allowing the design of scalable structures which fit the 5G applications. Based on the vision proposed here, a dual-band and a tri-band structures were built and characterized by their main parameters. Both prototypes achieved peak efficiencies around 80%, with adequate bandwidths and gains, as well as great compactness. Full article
(This article belongs to the Special Issue Antennas and Propagation)
Show Figures

Figure 1

Open AccessArticle
Small Antennas for Wearable Sensor Networks: Impact of the Electromagnetic Properties of the Textiles on Antenna Performance
Sensors 2020, 20(18), 5157; https://doi.org/10.3390/s20185157 - 10 Sep 2020
Abstract
The rapid development of wearable wireless sensor networks (W-WSNs) has created high demand for small and flexible antennas. In this paper, we present small, flexible, low-profile, light-weight all-textile antennas for application in W-WSNs and investigate the impact of the textile materials on the [...] Read more.
The rapid development of wearable wireless sensor networks (W-WSNs) has created high demand for small and flexible antennas. In this paper, we present small, flexible, low-profile, light-weight all-textile antennas for application in W-WSNs and investigate the impact of the textile materials on the antenna performance. A step-by-step procedure for design, fabrication and measurement of small wearable backed antennas for application in W-WSNs is also suggested. Based on the procedure, an antenna on a denim substrate is designed as a benchmark. It demonstrates very small dimensions and a low-profile, all while achieving a bandwidth (|S11| < −6 dB) of 285 MHz from 2.266 to 2.551 GHz, radiation efficiency more than 12% in free space and more than 6% on the phantom. Also, the peak 10 g average SAR is 0.15 W/kg. The performance of the prototype of the proposed antenna was also evaluated using an active test. To investigate the impact of the textile materials on the antenna performance, the antenna geometry was studied on cotton, polyamide-elastane and polyester substrates. It has been observed that the lower the loss tangent of the substrate material, the narrower the bandwidth. Moreover, the higher the loss tangent of the substrate, the lower the radiation efficiency and SAR. Full article
(This article belongs to the Special Issue Antennas and Propagation)
Show Figures

Figure 1

Open AccessArticle
A Fully-Printed CRLH Dual-Band Dipole Antenna Fed by a Compact CRLH Dual-Band Balun
Sensors 2020, 20(17), 4991; https://doi.org/10.3390/s20174991 - 03 Sep 2020
Abstract
In this paper, a new design method is proposed for a planar and compact dual-band dipole antenna. The dipole antenna has arms as a hybrid CRLH (Composite right- and left-handed) transmission-line comprising distributed and lumped elements for the dual-band function. The two arms [...] Read more.
In this paper, a new design method is proposed for a planar and compact dual-band dipole antenna. The dipole antenna has arms as a hybrid CRLH (Composite right- and left-handed) transmission-line comprising distributed and lumped elements for the dual-band function. The two arms are fed by the outputs of a compact and printed CRLH dual-band balun which consists of a CRLH hybrid coupler and an additional CRLH phase-shifter. Its operational frequencies are 2.4 and 5.2 GHz as popular mobile applications. Verifying the method, the circuit approach, EM (Electromagnetics) simulation and measurement are conducted and their results turn out to agree well with each other. Additionally, the CRLH property is shown with the dispersion diagram and the effective size-reduction is mentioned. Full article
(This article belongs to the Special Issue Antennas and Propagation)
Show Figures

Figure 1

Open AccessArticle
RF Channel-Selectivity Sensing by a Small Antenna of Metamaterial Channel Filters for 5G Sub-6-GHz Bands
Sensors 2020, 20(7), 1989; https://doi.org/10.3390/s20071989 - 02 Apr 2020
Abstract
In this paper, a new small antenna is suggested for 5G Sub-6-GHz band mobile communication. It can change the channel among the three given bands (called the 3.5-GHz area), as a wide-band antenna is connected to a small multiplexer comprising three metamaterial channel [...] Read more.
In this paper, a new small antenna is suggested for 5G Sub-6-GHz band mobile communication. It can change the channel among the three given bands (called the 3.5-GHz area), as a wide-band antenna is connected to a small multiplexer comprising three metamaterial channel filters. The function of channel selection of this antenna system is experimentally demonstrated to prove the validity of the presented scheme. The channel selection for 5G mobile communication is conducted from f1 (channel 1) through f2 (channel 2) to f3 (channel 3), when TX and RX antennas with gains over 0 dBi and S11 less than −10 dB are located far-field apart (RFar ≫ 2.1 cm), and result in the transmission coefficient (S21) being the greatest at the selected channel, which is detected by a vector network analyzer. Full article
(This article belongs to the Special Issue Antennas and Propagation)
Show Figures

Figure 1

Other

Jump to: Research

Open AccessLetter
A Single-Fed Multiband Antenna for WLAN and 5G Applications
Sensors 2020, 20(21), 6332; https://doi.org/10.3390/s20216332 - 06 Nov 2020
Abstract
In this paper, a slotted conical patch connected to a small triangular patch multiband antenna for both microwave and millimeter-wave applications is presented. The designed antenna has three characteristics. The proposed antenna is a multiband, having a compact size of 0.35λ0 [...] Read more.
In this paper, a slotted conical patch connected to a small triangular patch multiband antenna for both microwave and millimeter-wave applications is presented. The designed antenna has three characteristics. The proposed antenna is a multiband, having a compact size of 0.35λ0 × 0.35λ0 × 0.004λ0 at its lowest operational frequency, i.e., 2.4 GHz, and more importantly, it can cover both the microwave and millimeter-wave bands with a single feeding. According to the −10 dB matching bandwidth, experimental results show that the antenna operates at (2.450–2.495) GHz, (5.0–6.3) GHz, and (23–28) GHz. The reduced size, simple design, and multiband large bandwidth are some of the advantages over the reported designs in the latest literature. Both simulated and experimental results show a good agreement, and the proposed antenna can be used for wireless local area network (WLAN) applications and fifth-generation (5G) wireless communication devices. Full article
(This article belongs to the Special Issue Antennas and Propagation)
Show Figures

Figure 1

Open AccessLetter
Integration of Microstrip Slot Array Antenna with Dye-Sensitized Solar Cells
Sensors 2020, 20(21), 6257; https://doi.org/10.3390/s20216257 - 02 Nov 2020
Abstract
This paper describes the integration of microstrip slot array antennas with dye-sensitized solar cells that can power array antennas at 5.8 GHz, ensuring normal communications. To appraise the antennas, a 2 × 2 circularly polarized microstrip slot array antenna integrated with dye-sensitized solar [...] Read more.
This paper describes the integration of microstrip slot array antennas with dye-sensitized solar cells that can power array antennas at 5.8 GHz, ensuring normal communications. To appraise the antennas, a 2 × 2 circularly polarized microstrip slot array antenna integrated with dye-sensitized solar cells using a stacked design method was analyzed, fabricated and measured. The size of the entire array is 140 mm × 140 mm, where the size of each solar cell is 35 mm × 35 mm. The results show that the effect of the antenna has a slight influence on the output performance of the solar cells, and the interference of the output current of the solar cells to the antenna feeding system is negligible. The gain of the array antenna increases by 0.12 dB and the axial ratio is reduced to 1.50 dB after the integration of dye-sensitized solar cells. The integration saves a lot of space, and has the ability of self-sustaining power generation, thus providing reliable and long-term communication for various communication systems. Full article
(This article belongs to the Special Issue Antennas and Propagation)
Show Figures

Figure 1

Open AccessLetter
Timestamp Estimation in P802.15.4z Amendment
Sensors 2020, 20(18), 5422; https://doi.org/10.3390/s20185422 - 22 Sep 2020
Abstract
Due to the known issue that the ranging in the 802.15.4™-2015 standard is prone to external attacks, the enhanced impulse radio (EiR), a new amendment still under development, advances the secure ranging protocol by encryption of physical layer (PHY) timestamp sequence using the [...] Read more.
Due to the known issue that the ranging in the 802.15.4™-2015 standard is prone to external attacks, the enhanced impulse radio (EiR), a new amendment still under development, advances the secure ranging protocol by encryption of physical layer (PHY) timestamp sequence using the AES-128 encryption algorithm. This new amendment brings many changes and enhancements which affect the impulse-radio ultra-wideband (IR-UWB) ranging procedures. The timestamp detection is the base factor in the accuracy of range estimation and inherently in the localization precision. This paper analyses the key parts of PHY which have a great contribution in timestamp estimation precision, particularly: UWB pulse, channel sounding and timestamp estimation using ciphered sequence and frequency selective fading. Unlike EiR, where the UWB pulse is defined in the time domain, in this article, the UWB pulse is synthesized from the power spectral density mask, and it is shown that the use of the entire allocated spectrum results in a decrease in risetime, an increase in pulse amplitude, and an attenuation of lateral lobes. The paper proposes a random spreading of the scrambled timestamp sequence (STS), resulting in an improvement in timestamp estimation by the attenuation lateral lobes of the correlation. The timestamp estimation in the noisy channels with non-line-of-sight and multipath propagation is achieved by cross-correlation of the received STS with the locally generated replica of STS. The propagation in the UWB channel with frequency selective fading results in small errors in the timestamp detection. Full article
(This article belongs to the Special Issue Antennas and Propagation)
Show Figures

Figure 1

Open AccessLetter
An Ultra-Wide Band Antenna System for Pulsed Sources Direction Finding
Sensors 2020, 20(17), 4695; https://doi.org/10.3390/s20174695 - 20 Aug 2020
Abstract
Electric discharges in high-voltage power distribution systems can be localized through their electromagnetic signature in the radio-frequency range. Since discharges produce series of short pulses, the corresponding spectrum usually covers wide frequency ranges, typically up to 1 GHz. In this paper, we propose [...] Read more.
Electric discharges in high-voltage power distribution systems can be localized through their electromagnetic signature in the radio-frequency range. Since discharges produce series of short pulses, the corresponding spectrum usually covers wide frequency ranges, typically up to 1 GHz. In this paper, we propose an ultra-wide band (UWB) antenna system and a direction-finding (DF) approach based on using energy-based descriptors, instead of classical frequency-domain parameters. As an antenna system, we propose a dual-padlock configuration with a suitable pulse-matched response, featuring two unbalanced outputs. The proposed antenna system was successfully validated, both by simulations and measurements. Full article
(This article belongs to the Special Issue Antennas and Propagation)
Show Figures

Figure 1

Open AccessLetter
Wideband Dual-Polarized VHF Antenna for Space Observation Applications
Sensors 2020, 20(15), 4351; https://doi.org/10.3390/s20154351 - 04 Aug 2020
Abstract
This work presents the design for an antenna element that can be used in radio arrays for the monitoring and detecting of radio emissions from cosmic particles’ interactions in the atmosphere. For these applications, the pattern stability over frequency is the primary design [...] Read more.
This work presents the design for an antenna element that can be used in radio arrays for the monitoring and detecting of radio emissions from cosmic particles’ interactions in the atmosphere. For these applications, the pattern stability over frequency is the primary design goal. The proposed antenna has a high gain over a relative bandwidth of 88%, a beamwidth of 2.13 steradians, a small group delay variation and a very stable radiation pattern across the frequency bandwidth of 110 to 190 MHz. It is dual polarized and has a simple mechanical structure which is easy and inexpensive to manufacture. The measurements show that the ground has insignificant impact on the overall radiation pattern. Full article
(This article belongs to the Special Issue Antennas and Propagation)
Show Figures

Figure 1

Open AccessLetter
Evaluation and Impact Reduction of Common Mode Currents on Antenna Feeders in Radiation Measurements
Sensors 2020, 20(14), 3893; https://doi.org/10.3390/s20143893 - 13 Jul 2020
Abstract
Common mode currents on antenna feeders usually occur when feeding a symmetric radiator through an asymmetric line, or when the ground plane is electrically small. Such currents may have magnitudes comparable to the feed currents and therefore have a major impact on the [...] Read more.
Common mode currents on antenna feeders usually occur when feeding a symmetric radiator through an asymmetric line, or when the ground plane is electrically small. Such currents may have magnitudes comparable to the feed currents and therefore have a major impact on the total radiated field. For antenna radiation measurements, both assessment and reduction of the common mode currents on antenna feeders are crucial. Techniques to discriminate antenna and feeder radiation are mainly needed for design and optimization purposes. Antenna gain measurements in a multipath site can be performed by using the distance averaging method. In this paper, we show that the distance averaging technique can be applied to reduce the effect of common mode currents for measuring the field radiated by symmetrical antennas. Two measuring configurations are proposed depending on the number of symmetry degrees of the antenna under test, and a differential approach for extracting the field created by the common mode currents was also developed. The experimental validation was performed by measuring a simple wire dipole and a log-periodic dipole array (LPDA) with a small square loop as a probe, both on the feeder side and on the feeder free side. Full article
(This article belongs to the Special Issue Antennas and Propagation)
Show Figures

Figure 1

Back to TopTop