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Electronics
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Wideband and Multiband Antennas for Wireless Applications
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Wideband and Multiband Antennas for Wireless Applications

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Microwave and Wireless Communications".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 6805

Special Issue Editors

Dr. Zibin Weng

E-Mail Website
Guest Editor
The Key Laboratory of Antennas and Microwave Technology, Xidian University, Xi’an 710071, China
Interests: microwave and millimeter-wave components and systems; electromagnetic devices and antennas; millimeter wave, terahertz systems and antenna measurements
Prof. Dr. Yihong Qi

E-Mail Website
Guest Editor
Link Technologies (Hengqin) Co., Ltd., Hengqin 519031, China
Interests: antennas; RF OTA measurement; wireless intelligent sensing
Prof. Dr. Francesco de Paulis

E-Mail Website
Guest Editor
Electromagnetic Compatibility and Signal Integrity Laboratory, Department of Industrial and Information Engineering and Economics, University of L’Aquila, 67100 L’Aquila, Italy
Interests: signal and power integrity; electromagnetic compatibility; microwave and millimeter-wave components and systems; antenna design; antenna measurements
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The intention of this Special Issue “The wideband and multiband antenna for wireless applications”  is to gather together technical and scientific contributions on new antenna technologies aimed at developing the emerging wireless applications such as 5G, 6G communication base station and user equipment antennas, WiFi 6E,  WiFi 7 and compact WiFi antennas, smart world, wireless sensing and intelligent connected vehicle antennas. Such application fields pose challenging and critical requirements for antenna design in terms of bandwidth and the need for multiple working bands. Multiple bands are also widely adopted in compact wireless systems, such as multiband 5G and beyond communications, WiFi 6E and WiFi wireless terminals; therefore, a single multiband antenna solution would present an ideal yet challenging solution. The development of wideband antennas represents a key element for  some end-user equipment and applications, where the antennas must comply with the requirements of differently positioned human interfaces or complicated and dynamic changing working environments. The design of a wide-bandwidth antenna is also challenging due to the limited space of a wireless terminal; the placement of antennas in a confined environment usually leads to a large reduction in the antenna’s their efficiency and bandwidth. Novel antenna designs and theory to increase the embedded antenna bandwidth are also considered relevant fields within the wide bandwidth antenna design.

Topics of interest include, but are not limited to:

  • Antennas for 5G/6G communication base station and wireless terminals;
  • Antennas for wireless sensors;
  • Antennas for IoT;
  • Body-centric antennas;
  • Broadband antennas;
  • Conformal antennas;
  • Embedded antennas;
  • handheld devices;
  • Intelligent connected vehicle antennas;
  • Millimeter-wave through terahertz antennas;
  • Reconfigurable antennas;
  • Ultra-wideband (UWB) antennas;
  • Wearable antennas.

Dr. Zibin Weng
Prof. Dr. Yihong Qi
Prof. Dr. Francesco de Paulis
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 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. 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

  • wideband
  • embedded
  • IoT
  • reconfigurable
  • body-centric

Published Papers (5 papers)

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Research

14 pages, 10064 KiB  
Article
Compact-Transmission-Line Decoupling and Matching Network of Three-Element Array for Wireless Applications
by Chi Zhang and Yong-Chang Jiao
Electronics 2023, 12(7), 1567; https://doi.org/10.3390/electronics12071567 - 27 Mar 2023
Cited by 1 | Viewed by 947
Abstract
In this paper, a compact-transmission-line (TL) decoupling and matching network (DMN) for three-element circular arrays is presented. As a result of the miniaturization of wireless terminals, the antenna spacing is too close, leading to large couplings and deteriorating system performance. The DMN consists [...] Read more.
In this paper, a compact-transmission-line (TL) decoupling and matching network (DMN) for three-element circular arrays is presented. As a result of the miniaturization of wireless terminals, the antenna spacing is too close, leading to large couplings and deteriorating system performance. The DMN consists of an impedance transformation section and a star-shaped neutralization section which eliminates couplings between antennas while occupying a smaller area. The impedance transformation section converts the odd and even mode conductances of the antenna to the impedance of the feeding line, and the neutralization section eliminates the odd and even mode susceptances to complete the decoupling and matching of the antenna. The star-shaped circuit utilizes the area surrounded by the antennas in a more efficient manner than traditional triangle circuits. This facilitates the folding of the TL and the miniaturization of the circuit. A design formula is given for each module of the circuit after it has been analyzed analytically. A decoupling example is simulated and manufactured with the diameter of the area occupied by the DMN less than a quarter wavelength. At the working frequency, the port isolation is increased from 7.6 dB to 33.5 dB. The ECC between ports is reduced from 0.11 to 0.011, which validates the method proposed. Full article
(This article belongs to the Special Issue Wideband and Multiband Antennas for Wireless Applications)
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16 pages, 5408 KiB  
Communication
Fast Wide-Band RCS Analysis of the Coated Target Based on PBR Using EFIE-PMCHWT and the Chebyshev Approximation Technique
by Xing Wang, Fufu Yang, Chunheng Liu, Ying Liu, Haoxuan Gong and Hairong Zhang
Electronics 2023, 12(4), 923; https://doi.org/10.3390/electronics12040923 - 12 Feb 2023
Cited by 1 | Viewed by 918
Abstract
The Chebyshev approximation technique (CAT) combined with the MoM based on the electric-field integral equation (EFIE) and the Poggio–Miller–Chang–Harrington–Wu–Tsai (PMCHWT) integral equation is proposed to efficiently calculate the wide-band radar cross-section (RCS) based on passive bistatic radars (PBR). The EFIE-PMCHWT equations can be [...] Read more.
The Chebyshev approximation technique (CAT) combined with the MoM based on the electric-field integral equation (EFIE) and the Poggio–Miller–Chang–Harrington–Wu–Tsai (PMCHWT) integral equation is proposed to efficiently calculate the wide-band radar cross-section (RCS) based on passive bistatic radars (PBR). The EFIE-PMCHWT equations can be used to analyze the electromagnetic scattering of coated targets. The combination with CAT only requires computing the electric and magnetic currents at a few Chebyshev frequency points, which can be employed to obtain the electric and magnetic currents over the entire frequency band. In this study, the RCS values of a coated target calculated by the hybrid EFIE-PMCHWT-CAT based on passive bistatic radar (PBR) were found to be consistent with that calculated by the MoM based on the EFIE-PMCHWT. The validity of the hybrid method is verified by several numerical examples. Compared with the conventional MoM method, the hybrid method can greatly improve the efficiency for electromagnetic scattering problems over a wide frequency band. Full article
(This article belongs to the Special Issue Wideband and Multiband Antennas for Wireless Applications)
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13 pages, 4371 KiB  
Article
Determination of Excitation Amplitude and Phase for Wide-Band Phased Array Antenna Based on Spherical Wave Expansion and Mode Filtering
by Yao Su, Zixuan Song, Shuai Zhang and Shuxi Gong
Electronics 2022, 11(21), 3479; https://doi.org/10.3390/electronics11213479 - 26 Oct 2022
Cited by 1 | Viewed by 1673
Abstract
A new method for solving the excitation amplitude and phase of wide-band phased array antenna is presented, in which spherical wave expansion and mode filtering (SWEMF) techniques are applied for the first time. Different from the previous methods that are required of matrix [...] Read more.
A new method for solving the excitation amplitude and phase of wide-band phased array antenna is presented, in which spherical wave expansion and mode filtering (SWEMF) techniques are applied for the first time. Different from the previous methods that are required of matrix inversion or optimization iteration, the proposed SWEMF method is a forward calculation process. Thus, the solution is unique, and the result is closer to the true value. On the other hand, the SWEMF method only needs the total radiated field data of the array antenna in a small angular domain to ensure that the operation is simple and efficient. The effectiveness of the SWEMF method is successfully verified by examples of low sidelobe planar and linear arrays. The mean square error of the excitation amplitude can reach −38.88 dB. The range of excitation amplitude error is 0.05 v, and the excitation phase error is within 5.2°. This method takes about 60 s to calculate amplitude and phase at any one time. The feed amplitude and phase can be only calculated with the data in a small angular domain, and when the amount of data is small. Full article
(This article belongs to the Special Issue Wideband and Multiband Antennas for Wireless Applications)
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12 pages, 3580 KiB  
Article
Reflection Suppression through Modal Filtering for Wideband Antenna Measurement in a Non-Absorbent Environment
by Yao Su and Shuxi Gong
Electronics 2022, 11(20), 3422; https://doi.org/10.3390/electronics11203422 - 21 Oct 2022
Cited by 3 | Viewed by 1152
Abstract
In order to reduce the influence of multi-path effects on the measurement results of wideband antennas, this paper proposes a method for suppressing interference in wideband antenna measurements based on modal filtering technology. This paper introduces the theory and operation process of modal [...] Read more.
In order to reduce the influence of multi-path effects on the measurement results of wideband antennas, this paper proposes a method for suppressing interference in wideband antenna measurements based on modal filtering technology. This paper introduces the theory and operation process of modal filtering, establishes the relationship between the distribution of modal coefficient terms and the location of the antenna and external interference sources, and clearly reveals the principle of filtering interference through modal filtering. It is pointed out that each location of interference sources corresponds to different pattern items. Filtering out the power of the pattern term generated by the interference source is equivalent to filtering out the interference caused by the interference source. The sources filtered by this technology are external sources that are spatially separated from the antenna, including external sources, environmental reflections, and device reflections, among others. This feature makes it possible to be used for testing in a non-absorbent environment. Its ability to operate at almost any frequency makes it ideal for suppressing interference effects in wideband antenna measurement. This paper demonstrates a recent advance wherein modal filtering techniques are used in interference suppression for wideband antenna non-absorbent measurement. In the full bandwidth range of the wideband antenna, we verify the method through numerical simulation analysis and practical measurement. In the numerical simulation, we obtain that 15 dB interference can be filtered out at the −25 dB level and 5 dB interference can be filtered out at the −35 dB level. In the experiments, within the broadband antenna bandwidth, we found that 2.5 dB can be filtered at the −10 dB level at 4 GHz, 3 dB is filtered at the −10 dB level at 6 GHz, and 5 dB is filtered at the −10 dB level at 7.5 GHz. All of the above results prove that the proposed method can effectively suppress the multi-path interference in wideband non-absorbent antenna measurement and improve the measurement results. Full article
(This article belongs to the Special Issue Wideband and Multiband Antennas for Wireless Applications)
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11 pages, 5054 KiB  
Article
Compact 8 × 8 MIMO Antenna Design for 5G Terminals
by Haifu Zhang, Li-Xin Guo, Pengfei Wang and Hao Lu
Electronics 2022, 11(19), 3245; https://doi.org/10.3390/electronics11193245 - 09 Oct 2022
Cited by 3 | Viewed by 1513
Abstract
In this paper, a compact 8 × 8 MIMO antenna design for 5G terminals is proposed. The 8 × 8 MIMO antenna consists of two quad-element antenna pairs, each of which includes two symmetrical T-shaped monopole mode elements and two symmetrical edge-coupled fed [...] Read more.
In this paper, a compact 8 × 8 MIMO antenna design for 5G terminals is proposed. The 8 × 8 MIMO antenna consists of two quad-element antenna pairs, each of which includes two symmetrical T-shaped monopole mode elements and two symmetrical edge-coupled fed dipole mode elements. The size of the quad-element antenna is 38 × 7 × 0.8 mm3. T-shaped monopoles are decoupled by parasitic elements, and dipoles are decoupled by grounding strips. Meanwhile, both T-shaped monopoles and dipoles are also decoupled by the orthogonal mode. The results show that the operating frequency band of each antenna element meets the requirement of 3.4–3.6 GHz, the reflection coefficient is less than −6 dB, and the isolation between any antenna element is more than 10 dB. The antenna radiation efficiency is over 50% in the entire operating frequency band for the 8 × 8 MIMO system. Full article
(This article belongs to the Special Issue Wideband and Multiband Antennas for Wireless Applications)
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