Wideband Dielectric Resonator Antenna Research Articles

Miniaturized Dual-polarized, High-gain, and Wideband Dielectric Resonator Antenna for Low Band Massive MIMO Applications

Miniaturized Dual-polarized, High-gain, and Wideband Dielectric Resonator Antenna for Low Band Massive MIMO Applications

Design of Circularly Polarized Wideband Dielectric Resonator Antenna for Millimeter Wave Applications

Design of Circularly Polarized Wideband Dielectric Resonator Antenna for Millimeter Wave Applications

A novel wideband dielectric resonator antenna with compact size

ABSTRACT In this paper, a wideband dielectric resonator antenna with compact size is presented. The proposed antenna is formed by four dielectrics. Non-adjacent dielectrics have same permittivity constant. A 50-ohm micro strip feed line is used to exciting the antenna through the coupling slot. By optimizing the dimensions and structure of the antenna, impedance bandwidth of 3.25 to 4.4 GHz is obtained. Impedance bandwidth of the proposed antenna is a very wide bandwidth compared to the previous dielectric antennas. The antenna gain is about 9.6 dB.

Location of Early Stage Tumor Detection using Microwave Imaging in the Breast Phantom.

Universally, the most predominant cause of female mortality is mainly due to breast cancer. Owing to numerous constraints in the existing imaging technique, researchers are trying out an alternative tool to detect the tumor before going to the miserable stage. This article presents a novel method to detect the mean value system for detecting the location of the tumor in different depths by shifting the antenna anywhere in the breast tissue. In addition, an algorithm to reconstruct the breast image, namely Delay-Multiply-and-Sum (DMAS) is followed to identify the tumor implanted in the breast tissue. The analysis shows that the maximum mean value occurs while the antenna moves very near to the tumor while the mean value reduces while the antenna shifts apart from the tumor location. The mean value in different locations is converted into a microwave image. The high intensity in the image exhibits the precise position of the tumor. This technique can identify the location of early-stage tumor of size 3mm. Multiple tumors of sizes 6mm and 7mm can identify at a depth of 12mm and 18mm in the homogeneous breast phantom. DMAS can provide better imaging results in the early stage tumor of size 3mm embedded in the breast phantom. Microwave imaging is an efficient technique to differentiate healthy and malignant tissue in the breast. Antenna plays a major role in identifying tumors in the breast in the early stage. Hence a high-performance Ultra Wideband Dielectric Resonator Antenna (DRA-UWB) is used to identify the tumor in the breast. An antenna is sketched in different locations of the breast phantom. On account of the hemispherical structure, the mean value of the reflected signal is high at the center than at the edge. Hence, the difference in mean value is calculated with and without breast phantom for identifying the tumor location. The overall efficiency of this technique can be improved by using a high-performance UWB antenna. The image of the breast is reformed by the DMAS beamforming algorithm.

Metamaterial inspired square gap defected ground structured wideband dielectric resonator antenna for microwave applications

A metamaterial inspired dielectric resonator antenna (DRA) with square gap defected ground structure is proposed in the present work. Antenna has wideband characteristics with coverage of several commercial communication applications of Wi-Fi, WLAN, and satellite communications from 3.5 to 11.6 GHz. The metamaterial behavior of the proposed structure providing good impedance characteristics with peak realized gain of 7.7 dB and peak efficiency of 87% with dual band circular polarization from 4.2 to 6 GHz and 9.2–11.4 GHz respectively. The prototyped antenna model 1 without DRA providing good matching characteristics results and producing huge bandwidth of 8.1 GHz and the impedance bandwidth of 108%. DRA loaded antenna providing dual band circular polarization with axial ratio bandwidths of 36% and 28% respectively for wide range in the microwave communication applications.

DESIGN AND DEVELOPMENT OF SUPER WIDEBAND DIELECTRIC RESONATOR ANTENNA FOR NEXT-GENERATION TELECOMMUNICATIONS

The dielectric resonator antenna (DRA) has revolutionized the latest generation of communication systems with their obvious advantages of small size, bandwidth, and power-consuming capabilities. In this paper, an analysis of the impact of the dielectric material on the radiation characteristics of the DRA is presented with simulation reports. The proposed antenna takes the shape of a circular patch with the dielectric resonator having different shapes. This helps to analyze the impact of the tapering adjustments on the features of the antenna. The simulations are performed using the latest version of the complex electromagnetic modeling tool, and results are analyzed in terms of simulated reports like reflection coefficient (S11), voltage standing wave ratio, radiation patterns, and field distribution plots. The overall size of the proposed antenna is 18 × 12 mm<sup>2</sup>. The measured results are in good agreement with the simulation results. The proposed DRA is suitable for mobile wireless applications.

A 3D-Printed Encapsulated Dual Wide-Band Dielectric Resonator Antenna With Beam Switching Capability

A 3D-Printed Encapsulated Dual Wide-Band Dielectric Resonator Antenna With Beam Switching Capability

Wideband Circularly Polarized Cavity-Backed Dielectric Resonator Antenna With Low RCS for Aerial Vehicle Communications

This letter explains the design of a wideband circularly polarized dielectric resonator antenna (DRA) with a dual-cylindrical conformal cavity for aerial applications. The proposed dielectric resonator (DR) element uses multilayer cross-shaped elements of varying dimensions with an off-centered circular slot that is inserted inside the DR geometry. Combining the wideband DRA with a conformal cavity (bending angle, α = 5°) that provides wider impedance bandwidth of 111% from 5.02 to 17.52 GHz and axial ratio bandwidth of 32.29% from 6.18 to 8.56 GHz. The proposed antenna provides a higher gain of 10.77 dBi at 8.5 GHz, gain values better than 7.21 dBi, and radiation efficiency better than 90% for the complete band. Also, the proposed antenna provides good radar cross-section reduction mechanism for the entire working band.

A novel kind of wideband low-profile dielectric resonator antenna suitable for beam-scanning applications

In this paper, a low-profile wideband dielectric resonator antenna (DRA) with a very compact planar size is investigated. The antenna consists of a high permittivity dielectric sheet on the top, a low permittivity substrate in the middle, and a probe feeding structure at the bottom. By digging an annular slot in the designated area of the square dielectric sheet, the resonant frequency of fundamental TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">111</inf> mode can be effectively increased to be close to the high-order TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">131</inf> mode. The two modes can be finally merged together, yielding a wide impedance bandwidth of 16.6%. Most importantly, the combination of the two modes is done on the premise of a fixed antenna planar size, which can be very compact and suitable for beam-scanning applications. A probe feeding structure is used to excite the DRA, making the antenna simple and practical to be integrated with other RF circuits. For verification, antenna prototypes with single-feed linear polarization and differential-feed dual polarization were fabricated and measured. Reasonable agreement between the measured and simulated results is observed.

Aesthetic wideband dielectric resonator antenna based on fractal slot with two independently controllable resonant frequencies

Aesthetic wideband dielectric resonator antenna based on fractal slot with two independently controllable resonant frequencies

Mutual coupling reduction in wideband dielectric resonator antennas

Mutual coupling reduction in wideband dielectric resonator antennas

An array of staircase‐shaped circularly polarized DRA

A wide band circularly polarized (CP) aperture coupled staircase shaped wideband dielectric resonator antenna (SSCPDRA) array is implemented. The proposed array is composed of identical four SSCPDRA elements. The wideband CP and gain of the single element is enhanced by using 2 × 2 array with sequential phase feeding network. The measured results outputs emphasize that the proposed array is operated at frequency band from 8 to 12.3 GHz (43%). In addition, it has 3 dB axial ratio extended from 8.35 to 12.2 GHz (38.5%). Furthermore, the radiation pattern has broadside direction with the usability within the X-band applications.

Polarization reconfigurability enabled metamaterial inspired dielectric resonator based Fabry‐Perot resonator cavity antenna with high gain and bandwidth

A novel metamaterial inspired small array Fabry-Perot Resonator cavity antenna is designed over a wide-band dielectric resonator antenna to enhance gain and bandwidth operating at C-band applications. Further, the cavity resonator is modified with the application of 12 no. of RF p-i-n diodes between the upper layer of the posterior unit-cells to achieve the polarization reconfigurability (PR) keeping the bandwidth, gain and efficiency intact. The overall dimension of the proposed antenna is 0.8 λ × 0.8 λ × 0.56 λ. With the PR architecture, the antenna imparts 4.8 GHz bandwidth operating between 4 and 8.8 GHz with an average simulated efficiency of 72% and an average gain of 20 dBi throughout the operating band. The specific alignment of the diode polarity enables the model to obtain left-handed circular polarization and/or right-handed circular polarization.

Wide band hybrid dielectric resonator antenna for C band using FR-4 material

This article presents design of wideband dielectric resonator antenna (DRA) for C-band application using FR-4 material. In this paper analysis and layout of wide band DRA antenna is presented and its linear polarization characteristics are analysed. The microwave C band lies in the frequency range of 4 to 8 GHz. This antenna has category of ring DRA with modified hexagon shaped aperture structure. The Ansoft HFSS simulation software is used to design antenna. It basically covers the bandwidth from 4.4 GHz to 7.6 GHz and achieves a −10 dB impedance bandwidth of 90.9% at the centre frequency of 4.56 GHz and 6.2 GHz.

Wideband circularly polarized aperture coupled DRA array with sequential-phase feed at X-band

A novel 2 × 2 wideband dielectric resonator antenna (DRA) array with circular polarization and fed with a sequential-phase feeding network at the X-band is presented in this paper. The proposed DRA array is fed by an aperture coupled feeding network. Each DRA element is constructed by joining two identical pieces of half-cylindrical shape; those are shifted with respect to each other to produce two orthogonal modes, in order to achieve a broadband circular polarization and wideband impedance matching simultaneously. The rigorous analysis and optimization processes throughout this paper are carried out numerically. The proposed array demonstrates a maximum realized gain of 10.3 dB. The measured matching bandwidth ranges from 8 to 12 GHz (40%), with about 37% 3-dB axial ratio bandwidth within the matching bandwidth. The quadruple DRA elements array is fabricated, and its scattering parameters and far-fields performance are measured to validate the numerical results. Acceptable agreement between the simulated and measured results is accomplished. It is demonstrated that the proposed antenna is a potential candidate for radar and satellite applications at X-band.

Higher mode‐based wideband antenna design using an engineered cylindrical dielectric resonator

A new design mechanism has been explored to realise a single higher mode driven wideband dielectric resonator antenna (DRA). It targets an aperture coupled cylindrical DRA to operate in HEM 11Δ mode, which indeed is a first-order repetitive form of HEM 11δ mode. Innovative engineering has been realised on the DRA body as a mode-filtering technique to maintain the modal purity and hence, the radiation uniformity. A C-band prototype has been experimentally verified indicating as much as 24% impedance bandwidth with 8.5 dBi maximum gain. This design appears commercially viable and superior to the earlier, higher mode based developments, especially in terms of gain, but without involving any additional cost, weight, or design complexity.

A wideband dielectric resonator antenna with a cross slot aperture for 5G communications

This paper represents design of a wideband Rectangular Dielectric Resonator antenna fed by an aperture coupled technique. A bandwidth of 2.2 GHz has been achieved using a cross slot aperture in a ground plane for Dielectric Resonator Antenna (DRA). The simulated gain value achieved is 6.5dBi. The Rectangular Dielectric Resonator which has been designed in this paper can be used in 5G application frequency band of 24.25-27.5 GHz. The calculated percentage bandwidth is 15.38 %. An optimization of slot dimensions has also mentioned which can help to select a desired impedance match. The measured gain and bandwidth are efficient to use this design for various 5G applications. This unit cell wideband DRA can be used for millimeter wave frequencies of 5G.

Wideband High Gain Cylindrical Dielectric Resonator Antenna for X-Band Applications

Abstract In present work a wide band and high gain cylindrical dielectric resonator antenna working in X-band has been designed and validated experimentally. First the bandwidth of the antenna has been enhanced by placing the thin dielectric layer between antenna and feed network. Next gain of the antenna has been increased by placing a layer of high dielectric material at nearly λ/2 distance as superstrate. The proposed design with impedance bandwidth of 3 GHz and gain nearly 11dBi could be used in satellite communication and other wideband wireless applications operating in X-band.

Design and Analysis of Wideband Dielectric Resonator Antenna with Bandwidth and Gain Enhancement for C-Band Applications

This paper describes the modelling, simulation and analysis processes of a dielectric resonator antenna based on aperture-coupling mechanism at C-band. This antenna consists of three dielectric layers separated by an air gap to enhance the antenna gain. A rectangular aperture coupling slot is designed in the ground plane to feed the antenna from a microstrip feed line that is designed in the bottom layer of the antenna. Alumina layer with 12 relative permittivity is put as a top layer, while FR-4 layer with a lower permittivity of 4.3 is put lower to it. This arrangement of the antenna layers and its permittivities has enhanced the impedance bandwidth to more than 42% (3.9941 to 6.1492 GHz), and the realized gain to more than 10 dB. These enhancements of the antenna characteristics at C-band make it suitable for satellite and radar system applications.

A-shaped wideband dielectric resonator antenna for wireless communication systems and its MIMO implementation

In this article, a new A-shaped dielectric resonator antenna (DRA) excited by a conformal strip is proposed for wideband applications. The wide bandwidth is achieved by combining two adjacent modes that is, TM101 and TM103. The experimental results demonstrate that the proposed DRA offers an impedance bandwidth (for S11−10 dB) of 59.7% (3.24-6.0 GHz), covering IEEE 802.11 and U-NII bands. The antenna provides a fairly stable radiation pattern with the gain ranging from 5.29 to 7 dBi across the operating bandwidth. A dual-element multiple-input multiple-output (MIMO) system is also realized using the proposed wideband DRA. The impedance bandwidth of the dual-element MIMO antenna is 59.2% and 60.9% for Port1 and Port2, respectively and the isolation between the ports is better than 20 dB across the bandwidth. For Port1, the gain of the MIMO antenna ranging from 6.03 to 7.45 dBi is obtained across the bandwidth. Furthermore, the diversity performance of the MIMO antenna is found to be good with envelope correlation coefficient below 0.003 over the operating band. The proposed antenna could be the potential candidate for worldwide interoperability for microwave access (WiMAX), wireless local area network (WLAN) and lower European UWB frequency band (3.4-5.0 GHz) applications.