A dual-band, compact, high-gain, simple geometry, wideband antenna for 5G millimeter-wave applications at 28 and 38 GHz is proposed in this paper. Initially, an antenna operating over dual bands of 28 and 38 GHz was designed. Later, a four-port Multiple Input Multiple Output (MIMO) antenna was developed for the same dual-band applications for high data rates, low latency, and improved capacity for 5G communication devices. To bring down mutual coupling between antenna elements, a parasitic element of simple geometry was loaded between the MIMO elements. After the insertion of the parasitic element, the isolation of the antenna improved by 25 dB. The suggested creation was designed using a Rogers/Duroid RT-5870 laminate with a thickness of 0.79 mm. The single element proposed has an overall small size of 13 mm × 15 mm, while the MIMO configuration of the proposed work has a miniaturized size of 28 mm × 28 mm. The parasitic element-loaded MIMO antenna offers a high gain of 9.5 and 11.5 dB at resonance frequencies of 28 GHz and 38 GHz, respectively. Various MIMO parameters were also examined, and the results generated by the EM tool CST Studio Suite® and hardware prototype are presented. The parasitic element-loaded MIMO antenna offers an Envelop Correlation Coefficient (ECC) < 0.001 and Channel Capacity Loss (CCL) < 0.01 bps/Hz, which are quite good values. Moreover, a comparison with existing work in the literature is given to show the superiority of the MIMO antenna. The suggested MIMO antenna provides good results and is regarded as a solid candidate for future 5G applications according to the comparison with the state of the art, results, and discussion.

/pdf/isolation-improvement-of-parasitic-element-loaded-dual-band-24h8ryjv.pdf

Isolation Improvement of Parasitic Element-Loaded Dual-Band MIMO Antenna for Mm-Wave Applications

A compact multiple-input-multiple-output (MIMO) dielectric resonator antenna (DRA) that is suitable for internet of things (IoT) sensor networks is proposed with reduced coupling between elements. Two rectangular-shaped DRAs have been placed on the opposite sides of a Rogers substrate and each is fed using a coplanar waveguide (CPW) feed with slots etched in a dedicated metal ground plane that is located under the DRA. Moreover, locating the elements at the opposite sides of the substrate has improved the isolation by 27 dB without the need to incorporate additional complex structures, which has reduced the overall antenna size. Furthermore, a dual band operation is achieved since each antenna resonates at two frequencies: 28 GHz and 38 GHz with respective impedance matching bandwidths of 18% and 13%. As a result, the corresponding data rates are also increased independently. In addition to the advantages of improved isolation, compact size and dual band operation, the proposed configuration offers a diversity gain (DG), envelope correlation coefficient (ECC) and channel capacity loss (CCL) of 9.98 dB, 0.007, 0.06 bits/s/Hz over the desired bands, respectively. A prototype has been built with good agreement between simulated and measured results.

/pdf/a-compact-dual-band-mimo-dielectric-resonator-antenna-with-3q5b6ki7.pdf

A Compact Dual Band MIMO Dielectric Resonator Antenna with Improved Performance for mm-Wave Applications

This work presents the design and fabrication of a metamaterial-based stimulated dual band antenna on FR4 material (dielectric constant 4.3) to operate in Industrial, Scientific and Medical (ISM) and Radio-frequency Identification (RFID) applications. The antenna model had an overall dimension of 70 × 31 × 1.6 mm3 with etched T-slots and L-slots for dual band resonance. The main objective of this work was to enhance the gain performance characteristic at the selected dual band frequencies of 0.915 GHz and 2.45 GHz. Initially, it achieved a narrow bandwidth of 0.018 GHz with a gain of 1.53 dBi at a lower frequency, and 0.13 GHz of bandwidth featuring 4.49 dBi of gain at a higher frequency. The antenna provided an impedance bandwidth of 2% (0.905–0.923 GHz) and 5% (2.382–2.516 GHz) at two resonating frequencies. The antenna was integrated with a designed novel AMC structure to enhance the gain in CST Microwave Studio software with the finite integration method. The characteristic features of the AMC unit cell were observed at 0.915 GHz and 2.45 GHz frequencies and after antenna integration, the final prototype achieved a gain of 2.87 dBi at 0.915 GHz and 6.8 dBi at 2.45 GHz frequencies.

/pdf/a-metamaterial-inspired-amc-backed-dual-band-antenna-for-ism-17wzogqc.pdf

A Metamaterial Inspired AMC Backed Dual Band Antenna for ISM and RFID Applications

The need for a compact, economical, and low-power wireless system has given birth to the System-on-Chip (SoC) concept viable of a multitude of innovative applications. On-Chip-Antennas (AoCs) are an integral part of the SoC based wireless system and have got a remarkable attention since last one decade. In contrary to off-chip-antennas, AoCs are fabricated and integrated on the same substrate where the other components of the wireless system are fabricated. This integration results in several challenges besides highly desired benefits. The most serious challenge is the degradation in AoC’s key performance metrics, i.e. gain and radiation efficiency because of low-resistivity and high-permittivity of the Silicon substrate which is the optimized choice for the AoC design. This triggers a need for the use of novel methods for the mitigation of these performance issues. Consequently, a variety of such innovative methods have been proposed in the literature. However, a critical description on the recent developments in these methods at one place to facilitate a wide range of researchers is missing. Therefore, this article presents a well-organized and systematic survey on the recent advancements of the AoC’s performance-issues-mitigation-methods for wireless applications in Radio Frequency (RF), Millimeter-Wave (MM-Wave), and Terahertz (THz) bands for the first time. A concise description of future directions with respect to AoCs performance enhancement methods is also part of this article. It is anticipated that the critical presentation of these methods will make this article a valuable guide for a wide spectrum of researchers, who want to adventure with the tough task of high performance AoC design. In addition, it is envisioned that this article will pave a promising path for a further dominance of the AoCs in RF, MM-Wave, and THz regions.

/pdf/performance-issues-mitigation-techniques-for-on-chip-59e0gl3bv6.pdf

Performance-Issues-Mitigation-Techniques for On-Chip-Antennas – Recent Developments in RF, MM-Wave, and Thz Bands With Future Directions

Design of high-gain wideband substrate integrated waveguide dielectric resonator antenna for D-band applications

A wideband hemispherical dielectric resonator antenna (DRA) with enhanced gain is proposed for a frequency band of 20 to 28 GHz. The precise alignment and assembly of the DRA represent key challenges at such frequencies that were addressed using three approaches: the first was based on outlining the DRA position on the ground plane, the second involved creating a groove in the compound ground plane in which the DRA is placed, and the third was based on the 3D-printing of the DRA on a perforated substrate. In all cases, the same DRA was utilized and excited in a higher-order mode using an annular ring slot. The high gain was achieved by exciting a higher-order mode, and the wideband was obtained by merging the bandwidths of the two excited modes. The alignment methods used expedite the DRA prototyping by saving substantial time that is usually spent in adjusting the DRA position with respect to the feeding slot. The proposed configurations were measured, with an impedance bandwidth of 33.33% and a maximum gain of 10 dBi observed. Close agreement was achieved between the measured and simulated results.

https://www.mdpi.com/2079-9292/11/18/2917/pdf?version=1663661770

Wideband mm-Wave Hemispherical Dielectric Resonator Antenna with Simple Alignment and Assembly Procedures

This paper explores how varying the structure of an on-chip 60 GHz dielectric resonator antenna (DRA) affects radiation characteristics such as gain, bandwidth and efficiency. Three configurations have been considered a standalone antenna, antenna with a single dielectric superstrate, and antenna with a dielectric superstrate as well as a parasitic substrate. A considerably high broadside gain of 12.4 dBi been achieved when the superstrate and parasitic substrate (SPS) are utilized. This has been achieved in conjunction with a 7.2% impedance bandwidth and a radiation efficiency of 81.6 %. All optimizations have been done using CST and cross-validated using HFSS.

High Gain On-Chip Hemispherical Dielectric Resonator Antenna for 60 GHz Applications

This paper is a comprehensive review of the recent literature studies on the developments and applications of millimeter-wave (mm-wave) dielectric resonator antennas (DRAs). Different designs and techniques for linear and circular polarized DRAs are discussed thoroughly. In addition, array and multiple-input multiple-output (MIMO) DRAs operating in the K, Ka, and V bands are illustrated. These applications are highly advantageous on many levels, resulting in the improved performance of the DRA in terms of obtaining a higher gain, lower losses, a higher efficiency, and a lower profile. This work reviews the fundamental research trends in antennas to meet the demands of fifth-generation (5G) communications and beyond. The reviewed studies are scholarly sources which contain measurement-based results. This paper concludes by highlighting the limitations of the studies and the implications for future research.

/pdf/a-review-of-dielectric-resonator-antenna-at-mm-wave-band-2uq3ziyx.pdf

A Review of Dielectric Resonator Antenna at Mm-Wave Band

A novel approach is proposed to design a circularly polarized (CP) hemispherical dielectric resonator antenna (DRA) with a wide axial ratio (AR) bandwidth by incorporating an additional dielectric substrate between the antenna and the ground plane. This is in addition to the lower feeding substrate that is located between the ground plane on one side and the feeding microstrip line on the other side. Adding another substrate on top of the ground plane provided an additional degree of freedom in the design that facilitated the achievement of ab 18% AR bandwidth. In addition, an integrated hemispherical DRA and perforated substrate configuration was utilized to achieve optimum effective substrate permittivity and overcome the DRA alignment and assembly challenges while maintaining the achieved wide CP bandwidth. A close agreement was achieved between measurements and simulations.

/pdf/wideband-circularly-polarized-millimeter-wave-hemispherical-2njq8qe4.pdf

Meshari D. Alanazi

Papers

A Compact Dual Band MIMO Dielectric Resonator Antenna with Improved Performance for mm-Wave Applications

Wideband mm-Wave Hemispherical Dielectric Resonator Antenna with Simple Alignment and Assembly Procedures

High Gain On-Chip Hemispherical Dielectric Resonator Antenna for 60 GHz Applications

A Review of Dielectric Resonator Antenna at Mm-Wave Band

Wideband Circularly Polarized Millimeter Wave Hemispherical Dielectric Resonator Antenna