1,721,006 research outputs found
Novel Flower-shaped Multiple Input Multiple Output Dielectric Resonator Antenna
Get PDFIn modern communication systems, dielectric resonator antennas (DRA) play an important
role due to its several advantages over contemporary antennas. In this paper, novel flower shaped multiple input multiple output (MIMO) DRA is proposed for wireless applications in
X- band. The proposed antenna with four ports displays more than -15 dB isolation between
ports with defected ground technique. The antenna exhibits 7.2-7.5 GHZ impedance
bandwidth and 4.66 dBi gain at 7.3 GHz. MIMO performance parameters: Envelope
Correlation Coefficient (ECC) and Diversity Gain (DG) of the proposed antenna are also
studied and calculate
Ultra-wide-band Circularly Polarized Mushroom-shaped Dielectric Resonator Antenna for 5G and sub-6 GHz Applications
Get PDFIn this paper, a mushroom shaped ultrawideband circularly polarized Dielectric Resonator Antenna (DRA) is proposed for lower 5G band and sub-6 GHz applications. The proposed DRA is excited by two orthogonal conformal probes and fed by a simple L shape microstrip feed network. The DRA exhibits wide impedance bandwidth of approximately 34.5% (3.5-5.1 GHz) with S11 better than -10 dB and wide circular polarization bandwidth of 33% (3.55-5 GHz) with axial ratio less than 3 dB in broadside direction. Mushroom-shaped DRA has a peak gain of 6.5 dBi and an average gain throughout the operating band is 5.5 dBi. Simulated results of the DRA are in good agreement with measured results of fabricated prototype. This DRA is a strong candidate for the sub-6 GHz and 5G band applications
Novel superman-diamond inspired DRA for X band applications
Get PDFExploiting advantage of Dielectric Resonator Antennas (DRA), in this dissemination a novel superman-diamond inspired shaped DRA has been proposed for X-band applications. Furthermore, possibilities of Multiple Input Multiple Output (MIMO) DRA explored using proposed novel shaped DRA and a two-element MIMO DRA has also been proposed for X-band applications. Proposed DRA made up of anisotropic composite ceramic material with dielectric constant 10 has been placed on the substrate with dielectric constant 3.55 and thickness 20 mil. Proposed DRA and MIMO DRA have demonstrated 11.7% and 9.5% impedance bandwidths, respectively. Other performance characteristics of MIMO DRA such as mutual coupling, isolation between ports, ECC, TARC have also been examined. To validate the performance of proposed DRA, simulated performances have been compared between two electromagnetic simulator solvers
Hemicyl Shaped Circularly Polarized Wideband DRA
No full textTo achieve circular polarisation, a novel circularly polarised hemicyl-shaped dielectric resonator antenna is presented for 5G applications, which is excited utilising orthogonal feeds. A prototype of the suggested antenna has been built, and the measured results match the simulation results. The antenna has a wide impedance bandwidth of 3.5-5.1 GHz, as well as a circular polarisation bandwidth of 3.55-5 GHz. The antenna's average gain across the whole operational bandwidth is 5.5 dBi. The antenna works in the sub-6 GHz band, which is used for a variety of wireless applications including 5G
Novel Circularly Polarized MIMO Dielectric Resonator Antenna for 28 GHz Applications
Get PDFA novel circularly polarized MIMO Dielectric Resonator Antenna (DRA) for 28 GHz band applications is proposed. The DRA is excited by microstrip line structure which produce circular polarization due to orthogonal feed arrangement maintaining symmetry between both the ports. Impedance bandwidth of MIMO DRA is 27-29 GHz, axial ratio bandwidth is 27.5-28.75 GHz, and maximum simulated gain is 7.53 dBi at 27.6 GHz which covers the targeted 28 GHz band (27.5-28.35 GHz) for the 5G applications. Due to wider overlapping of axial ratio bandwidth with impedance bandwidth, proposed MIMO DRA is good candidate for 5G communication at 28 GHz band. Simulated and measured results are in good agreement, making proposed DRA a good choice for mm wave applications
Application of Dielectric Resonator Antenna in Implantable Medical Devices
Get PDFWireles biomedical telemetry through Implantable Medical Devices (IMD) has been one of the major interest of human kind in present times due to life supporting advantages. As sensors, actuators, battery and antenna comprises the IMD and role of efficient radiator describes the quality of implantable device. However, Dielectric Resonator Antennas (DRA) have been proved more efficient in comparison to their contemporaries in different applications due to its inherent properties, but application of DRA in implantable devices is not proposed yet. In this paper, a rectangular DRA resonating at 2.45 GHz excited by coplanar waveguide feed has been proposed for in depth implantable applications
Novel circularly polarized dielectric resonator antenna for microwave image sensing application
Get PDFIn this article, a novel, simple, and compact structure of dielectric resonator antenna is proposed, which provides wide bandwidth across proposed mm wave band for microwave image sensing with considerable gain using a lossy FR-4 epoxy substrate and thick FR4 as DRA. A DR can be excited using four-line feed using a circular loop type feed network. These line feeds maintain phase difference of 90° to produce CP. This antenna provides approximate constant gain of 8.6 dB on 25-26 GHz band and 3 dB axial ratio bandwidth is almost 1 GHz from 25.2 to 26.2 GHz, Impedance bandwidth of the proposed antenna is 3 GHz (24-27 GHz). This antenna can be used in microwave image sensing and wearable sensors applications, due to its compactness (30 × 30 mm 2 ), in mm wave band
Dual-port MIMO dielectric resonator antenna for WLAN applications
Get PDFA dual-port multiple-input multiple-output (MIMO) dielectric resonator antenna (DRA) for 5 GHz IEEE (802.11a/h/j/n/ac/ax) is discussed in this article. Two prototypes of single feed DRA and dual feed MIMO DRA are fabricated and measured results are compared with the simulated data. The proposed single feed DRA and dual feed MIMO DRA exhibits wide impedance bandwidth (IBW). Antennas have been fabricated on Rogers RT Duroid substrate with Eccostock made DRA placed over the substrate. DRAs are excited by aperture coupled feed to achieve wide bandwidth and high efficiency. The measured IBW of uniport DRA and dual-port MIMO DRA are 26.6% (4.75-6.21 GHz) and 27.5% (4.7-6.2 GHz) respectively. Maximum gain of the antenna is 7.4 dBi. The results of the antennas are in good agreement with simulated data and they are suitable for WLAN applications. These antennas are also compact with area of substrate 32.8 cm2
Circularly polarized V-shaped dielectric resonator antenna
Get PDFIn this article, a probe fed V-shaped dielectric resonator antenna (DRA) loaded with circular patches, is proposed for X band applications. A prototype was fabricated to validate the results. Circular polarization is achieved by the geometry of DRA integrated with the circular patches on its surface. These circular patches behave as a monopole antenna. To achieve circular polarization two orthogonal fields have been excited in the DRA, which are in time phase quadrature. Due to the symmetry of design, it shows dual polarization, both Left Hand Circular Polarization (LHCP) and Right Hand Circular Polarization (RHCP), in two orthogonal directions. The fabricated prototype exhibits wide impedance bandwidth of 7.85-10.1 GHz (25%) and circular polarization (CP) Bandwidth (BW) of 8.35-8.7 GHz (4%). Maximum measured gain of 4.8 dBi has been obtained in comparison with the simulated gain of 5.6 dBi. Applications of the proposed antenna include satellite communication, telemetry tracking and control, Synthetic aperture radar (SAR), weather radar, and military radar in X band. Directional CP performance is useful in designing a smart antenna and multiple input multiple output (MIMO) antenna
Manipulating the radiation pattern of equilateral triangular dielectric resonator antenna using asymmetric grooves
Get PDFA new method to manipulate the radiation pattern of a triangular dielectric resonator antenna is proposed here. By engraving asymmetric grooves in the antenna walls, the intensity of electric fields on its walls is adjusted, which, if properly done, leads to an increase in the directivity of the antenna. Then, the possibility of rotating the radiation pattern by creating asymmetric grooves in the antenna wall is investigated. It is proved that by adjusting the ratio of the amplitude of equivalent magnetic currents on the antenna walls, rotation can be created in the main beam of the antenna pattern. The simulation results are validated by measuring the reflection coefficient, radiation patterns, and gain of the DRA. The measured results confirm that the antenna operates from 3.1 to 3.8 GHz and the maximum gain is 9.2 dBi
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