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Electronics
Special Issues
Emerging Research in Microwave Systems and Applications
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Emerging Research in Microwave Systems and 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 (30 September 2022) | Viewed by 6570

Special Issue Editors

Dr. Augustine O. Nwajana

E-Mail Website
Guest Editor
School of Engineering, University of Greenwich, London SE10 9LS, UK
Interests: radio frequency identification; wireless sensors; RFID data fusion; smart healthcare; fil-tering devices; RF power dividers; antennas
Special Issues, Collections and Topics in MDPI journals
Dr. Kenneth S. K. Yeo

E-Mail Website
Guest Editor
Department of Electrical and Electronic Engineering, Universiti Teknologi Brunei, Bandar Seri Begawan BE1410, Brunei
Interests: RF/microwave circuits and components; filtering antennas; SIW

Special Issue Information

Dear Colleagues,

The electromagnetic (EM) spectrum is becoming overcrowded with a variety of wireless signals and other communication and sensing circuits and devices. This has led to an increased interest in the design of RF and microwave systems and subsystems to help to decongest the overwhelmed EM spectrum. However, journals currently available for accepting and publishing research outputs in this field are scarce.

This Special Issue will focus on systems and applications that operate within the radiofrequency (RF) and microwave frequency bands. Electromagnetic (EM) waves with frequencies ranging from 300 to 300 GHz are classified as microwaves. This frequency range corresponds to the free space wavelengths of 1 m to 1 mm, respectively. EM waves with frequencies ranging from 30 to 300 GHz are classified as millimetre waves, because their wavelengths fall above 1 mm and below 10 mm. The radiofrequency (RF) spectrum falls below the microwave spectrum, though the boundary between the RF and microwave spectra is arbitrary and depends on the technology developed for the exploitation of the specific spectrum.

Dr. Augustine O. Nwajana
Dr. Kenneth S. K. Yeo
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

  • RF/microwave circuits and devices
  • battery-free RF/microwave systems
  • antennas and propagation
  • cognitive radio/radar systems
  • satellite and wireless systems
  • passive components (e.g., filters, couplers, and power dividers)
  • active components (e.g., amplifiers, mixers, and oscillators)
  • wireless/radio access technologies
  • metamaterials
  • wireless power transfer and energy harvesting
  • substrate integrated waveguide

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Published Papers (2 papers)

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Research

11 pages, 2976 KiB  
Article
A Simple Method to Design a UWB Filter with a Notched Band Using Short-Circuit Step Impedance Stubs
by Li-Qin Liu, Huang-Sheng Lai, Hao-Ming Hu, Jun-Jie Chen, Min-Hang Weng and Ru-Yuan Yang
Electronics 2022, 11(7), 1124; https://doi.org/10.3390/electronics11071124 - 1 Apr 2022
Cited by 11 | Viewed by 2269
Abstract
This article presents a simple method to design an ultra-wideband (UWB) bandpass filter (BPF) with a notched band. The structure of the filter is simple and is composed of a single half-wavelength resonator loaded with three sets of short-circuit step impedance stubs. An [...] Read more.
This article presents a simple method to design an ultra-wideband (UWB) bandpass filter (BPF) with a notched band. The structure of the filter is simple and is composed of a single half-wavelength resonator loaded with three sets of short-circuit step impedance stubs. An equivalent circuit model is presented to analyze the resonance characteristics. Compared with the traditional quarter-wavelength uniform impedance stub, the novelty of the short-circuit step impedance stub introduces two design parameters: the impedance ratio (K) and the electrical length ratio (α). Therefore, by adjusting these design parameters, the frequencies of the first two notched bands can be tuned widely, so a wide frequency band with a notched band can easily be achieved. With a K of 0.36 and an α of 0.6, the designed filter achieved an ultra-wideband bandpass response with a notched band. The UWB response had a passband range of 2.5 GHz–10.5 GHz and a notched band around 5.1 GHz with an attenuation of about 45 dB. The insertion loss in the entire passband was less than 1.26 dB, and the return loss was larger than 10 dB on average. The maximum group delay variation in the two passbands was less than 0.3 nS. The measurement results showed good agreement with the simulation results. Full article
(This article belongs to the Special Issue Emerging Research in Microwave Systems and Applications)
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14 pages, 6473 KiB  
Article
Design and Performance Analysis of a Compact Quad-Element UWB MIMO Antenna for Automotive Communications
by Sriram Arumugam, Sangeetha Manoharan, Sandeep Kumar Palaniswamy and Sachin Kumar
Electronics 2021, 10(18), 2184; https://doi.org/10.3390/electronics10182184 - 7 Sep 2021
Cited by 21 | Viewed by 2939
Abstract
This paper presents the design and analysis of a planar ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna for modern vehicular communication systems. The proposed unit cell antenna structure was designed using modified elliptical radiators on a Rogers RO3003 substrate, has a size of 22 × [...] Read more.
This paper presents the design and analysis of a planar ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna for modern vehicular communication systems. The proposed unit cell antenna structure was designed using modified elliptical radiators on a Rogers RO3003 substrate, has a size of 22 × 22 × 0.76 mm3, and covers an impedance bandwidth (S11 ≤ −10 dB) of 3.14 GHz to 12.24 GHz. The peak gain and efficiency of the unit cell prototype are 5.1 dBi and 81%, respectively. The unit cell was further developed into a MIMO antenna configuration with four elements placed orthogonal to each other in a single plane measuring 50 × 50 × 0.76 mm3. The measured isolation between the antenna elements was greater than 20 dB. The measured envelope correlation coefficient (ECC) of the MIMO antenna was less than 0.004, the diversity gain (DG) was greater than 9.67 dB, the total active reflection coefficient (TARC) was <−10 dB, and the mean effective gain (MEG) ratio was > 0.99. The characteristics of the proposed unit cell and the MIMO antenna were investigated for housing effects in order to validate the consistent performance of the antenna in the presence of conducting bodies. In addition, the radiation characteristics of the antenna when mounted on a vehicle were analyzed using a virtual model of the car. The results show that the proposed quad-element UWB MIMO array is compact, has good performance, and is well-suited for automotive applications. Full article
(This article belongs to the Special Issue Emerging Research in Microwave Systems and Applications)
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