Jingtao Zeng

Bio: Jingtao Zeng is an academic researcher from City University of Hong Kong. The author has contributed to research in topics: Dipole antenna & Broadband. The author has an hindex of 1, co-authored 1 publications receiving 14 citations.

Single-Layered Broadband Magnetoelectric Dipole Antenna for New 5G Application

Abstract: In this letter, a new type of broadband magnetoelectric dipole antenna is investigated and implemented for millimeter-wave applications, particularly for new fifth-generation (5G) applications. The proposed antenna has broadband operating bandwidth and high front–back radiation level owing to its complementary antenna configuration. The antenna also features a single-layer structure to bring about ease of fabrication and low profile. The antenna covers an operating bandwidth of 50.4% (47.5–79.5 GHz), which thoroughly covers the new unlicensed band in the new 5G standard. The antenna yields advantages of broadband, low back-radiation level, and low fabrication cost.

Fifth Generation Antennas: A Comprehensive Review of Design and Performance Enhancement Techniques

Abstract: The intensive research in the fifth generation (5G) technology is a clear indication of technological revolution to meet the ever-increasing demand and needs for high speed communication as well as Internet of Thing (IoT) based applications. The timely upgradation in 5G technology standards is released by third generation partnership project (3GPP) which enables the researchers to refine the research objectives and contribute towards the development. The 5G technology will be supported by not only smartphones but also different IoT devices to provide different services like smart building, smart city, and many more which will require a 5G antenna with low latency, low path loss, and stable radiation pattern. This paper provides a comprehensive study of different antenna designs considering various 5G antenna design aspects like compactness, efficiency, isolation, etc. This review paper elaborates the state-of-the-art research on the different types of antennas with their performance enhancement techniques for 5G technology in recent years. Also, this paper precisely covers 5G specifications and categorization of antennas followed by a comparative analysis of different antenna designs. Till now, many 5G antenna designs have been proposed by the different researchers, but an exhaustive review of different types of 5G antenna with their performance enhancement method is not yet done. So, in this paper, we have attempted to explore the different types of 5G antenna designs, their performance enhancement techniques, comparison, and future breakthroughs in a holistic way.

Cost-Efficient Bi-Layer Modeling of Antenna Input Characteristics Using Gradient Kriging Surrogates

Abstract: Over the recent years, surrogate modeling has been playing an increasing role in the design of antenna structures. The main incentive is to mitigate the issues related to high cost of electromagnetic (EM)-based procedures. Among the various techniques, approximation surrogates are the most popular ones due to their flexibility and easy access. Notwithstanding, data-driven modeling of antenna characteristics is associated with serious practical issues, the primary one being the curse of dimensionality, particularly troublesome due to typically high nonlinearity of antenna responses. This limits applicability of conventional surrogates to simple structures described by a few parameters within narrow ranges thereof, which is grossly insufficient from the point of view of design utility. Many of these issues can be alleviated by the recently proposed constrained modeling techniques that restrict the surrogate domain to regions containing high-quality designs with respect to the relevant performance figures, which are identified using the pre-optimized reference designs at an extra computational effort. This paper proposes a methodology based on gradient-enhanced kriging (GEK). It enables a considerable reduction of the number of reference points required to construct the inverse surrogate (employed in surrogate model definition) by incorporating the sensitivity data into the nested kriging framework. Using two antenna examples, it is demonstrated to yield significant savings in terms of the surrogate model setup cost as compared to both conventional modeling methods and the original nested kriging.

Multimode Hybrid Antennas Using Liquid Dielectric Resonator and Magneto-Electric Dipole

Abstract: This article presents a new type of hybrid antenna that combines the multiresonant modes produced by a liquid dielectric resonator antenna (DRA) and a magnetoelectric (ME) dipole. Such a combination could not be easily realized by using conventional solid dielectrics due to fabrication and air-gap problems. An aperture-fed ME dipole for 4.1–5.3 GHz is firstly designed using a standard structure and a relatively small dimension. Then, a hybrid antenna is built by loading the ME-dipole with an aperture-fed cylindrical liquid DRA. Without increasing the antenna size and/or modifying the ME-dipole structure significantly, the hybrid antenna has realized a much wider bandwidth from 2.45 to 5.3 GHz after loading the liquid material. Moreover, it is found that the resonances of the ME-dipole are not simply shifted to lower frequencies after using the dielectric loading, it has strategically combined the multiple resonances of the electric dipole, magnetic dipole, DRA, and feeding slot. The mode combination principle and design guideline have been presented. As an example, a prototype of the proposed hybrid antenna has achieved a 73.5% fractional bandwidth with an electrical size of $0.66\times 0.66\times 0.16\,\, \boldsymbol {\lambda }_{\mathbf {0}}^{3}$ at the center frequency (3.88 GHz), over 5 dBi (up to 7 dBi) broadside gain, total efficiency >80%, and beamwidth around 80°–120° across the frequency band. The proposed hybrid antenna has advantages in terms of wide bandwidth, smaller size, and simple structure compared with other ME-dipoles and traditional wideband antennas. The idea of this antenna design could be extended to other ME-dipole and DRA structures.

Broadband Antenna Design With Integrated CB-CPW and Parasitic Patch Structure for WLAN, RFID, Wimax, and 5G Applications

Abstract: This paper presents a novel CB-CPW wideband antenna design. HFSS software simulations reveal that the proposed design has a semicircle ground structure, transmission line, parasitic ground, CPW, relatively low return loss, broadband effect of 3.3377 GHz (4.8337 GHz-8.1714 GHz), double beam capability at 5.2 GHz, and four-beam capability at 5.5 GHz (5.8 GHz). It is compact in size at only 40 mm × 40 mm × 1 mm. A prototype of the proposed antenna was fabricated and measured to validate the simulated design; the results show a bandwidth of 3.38 GHz (3.95 GHz-7.33 GHz), relative bandwidth of 74%, and maximum gain of 3.87 dBi in the range of 5 GHz to 6 GHz; the prototype also achieves two and four-beam performance. Its working frequency covers WLAN (5.15 GHz-5.25 GHz and 5.725 GHz-5.825 GHz), radio frequency identification RFID (5.8 GHz), and global microwave internet access WiMAX (5.25 GHz-5.85 GHz) frequency bands.

Simulation-Driven Antenna Modeling by Means of Response Features and Confined Domains of Reduced Dimensionality

Abstract: In recent years, the employment of full-wave electromagnetic (EM) simulation tools has become imperative in the antenna design mainly for reliability reasons. While the CPU cost of a single simulation is rarely an issue, the computational overhead associated with EM-driven tasks that require massive EM analyses may become a serious bottleneck. A widely used approach to lessen this cost is the employment of surrogate models, especially data-driven ones: versatile and easily accessible. Yet, one of the unresolved issues remains the curse of dimensionality. Standard modeling techniques are merely capable of rendering surrogates for low-dimensional cases within narrow parameter ranges. In pursuit to overcome these limitations, a novel technique has been recently proposed, where the overall modeling process is carried out within a confined domain, set up based on performance specifications and spectral analysis of an auxiliary set of reference designs. This work offers a further development of the aforementioned method. Instead of tackling the entire antenna responses, only the selected characteristic points (relevant to the figures of interest considered in the antenna design process) are handled. This allows for achieving excellent model accuracy at a low computational cost. The proposed approach can be an attractive modeling alternative for systems with well-structured characteristics.