scholarly journals Cylindrical Dielectric Resonator Antennas with Harmonic Control as an Active Antenna Radiator

2009 ◽  
Vol 2009 ◽  
pp. 1-7
Author(s):  
L. Lucci ◽  
G. Manara ◽  
P. Nepa ◽  
G. Pelosi ◽  
S. Selleri
Keyword(s):  
Dielectric Resonator ◽  
Shape Factor ◽  
Satellite Communications ◽  
Reactive Elements ◽  
Active Antenna ◽  
Dielectric Resonator Antenna ◽  
Feed System ◽  
Dielectric Resonator Antennas ◽  
Harmonic Control ◽  
Integrated Antenna

A cylindrical dielectric resonator antenna is proposed as a radiator for an active integrated antenna. Harmonic tuning, which is the key step in designing active antenna radiators, is achieved via a combination of shape factor control over the resonator and insertion of reactive elements in the feed system. Numerical simulations are carried out in a finite elements framework and a layout for the complete antenna is proposed, aimed at compactness for subsequent utilization of the radiator as an element in an active array for satellite communications.

scholarly journals Investigation on Harmonic Tuning for Active Ku-Band Rectangular Dielectric Resonator Antennas

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Anda Guraliuc ◽  
Giuliano Manara ◽  
Paolo Nepa ◽  
Giuseppe Pelosi ◽  
Stefano Selleri
Keyword(s):  
Dielectric Resonator ◽  
Shape Factor ◽  
Phased Array ◽  
Fine Tuning ◽  
Dielectric Resonator Antenna ◽  
Dielectric Resonator Antennas ◽  
Power Added Efficiency ◽  
Radiating Element ◽  
Integrated Antenna ◽  
Ku Band

A slot-coupled rectangular dielectric resonator antenna (DRA) operating in the 14–14.5 GHz frequency band is investigated as a possible radiating element for an active integrated antenna of a transmitting phased array. The effectiveness of the resonator shape factor on achieving harmonic tuning is addressed. Simulation results show that the DRA shape factor can be used to provide a fine tuning of the DRA input impedance both at the fundamental frequency and its first harmonics, so synthesizing the proper load for the optimization of the microwave amplifier power-added efficiency (PAE).

scholarly journals Bio-Inspired Dielectric Resonator Antenna for Wideband Sub-6 GHz Range

2020 ◽  
Vol 10 (24) ◽  
pp. 8826
Author(s):  
Luigi Melchiorre ◽  
Ilaria Marasco ◽  
Giovanni Niro ◽  
Vito Basile ◽  
Valeria Marrocco ◽  
...  
Keyword(s):  
Dielectric Resonator ◽  
Technological Development ◽  
High Gain ◽  
Geometrical Parameters ◽  
Dielectric Resonator Antenna ◽  
Frequency Range ◽  
Dielectric Resonator Antennas ◽  
Antenna Performance ◽  
Rapid Production ◽  
Manufacturing Technologies

Through the years, inspiration from nature has taken the lead for technological development and improvement. This concept firmly applies to the design of the antennas, whose performances receive a relevant boost due to the implementation of bio-inspired geometries. In particular, this idea holds in the present scenario, where antennas working in the higher frequency range (5G and mm-wave), require wide bandwidth and high gain; nonetheless, ease of fabrication and rapid production still have their importance. To this aim, polymer-based 3D antennas, such as Dielectric Resonator Antennas (DRAs) have been considered as suitable for fulfilling antenna performance and fabrication requirements. Differently from numerous works related to planar-metal-based antenna development, bio-inspired DRAs for 5G and mm-wave applications are at their beginning. In this scenario, the present paper proposes the analysis and optimization of a bio-inspired Spiral shell DRA (SsDRA) implemented by means of Gielis’ superformula, with the goal of boosting the antenna bandwidth. The optimized SsDRA geometrical parameters were also determined and discussed based on its fabrication feasibility exploiting Additive Manufacturing technologies. The results proved that the SsDRA provides relevant bandwidth, about 2 GHz wide, and satisfactory gain (3.7 dBi and 5 dBi, respectively) at two different frequencies, 3.5 GHz and 5.5 GHz.

A superstrate loaded aperture coupled dual-band circularly polarized dielectric resonator antenna for X-band communications

2020 ◽  
pp. 1-8
Author(s):  
Sounik Kiran Kumar Dash ◽  
Qingsha S. Cheng ◽  
Taimoor Khan
Keyword(s):  
Circular Polarization ◽  
Dielectric Resonator ◽  
Satellite Communications ◽  
Dual Band ◽  
Dielectric Resonator Antenna ◽  
Development Stages ◽  
The Third ◽  
X Band ◽  
Fabrication And Characterization ◽  
Slot Coupling

Abstract A superstrate loaded cylindrical dielectric resonator antenna is developed and demonstrated for dual-band circular polarization. The proposed antenna employs a microstrip-fed rotated cross-shaped slot coupling technique for exciting the dielectric resonator (DR). The design is developed in a straight forward way. Firstly, the DR is coupled with a conventional plus-shaped slot and operates in linear polarization mode at 7.4 and 11.2 GHz. Secondly, the slot is rotated by 10° to enable out-of-phase excitation and ensure circular polarization at the above-mentioned frequencies. In the third step, a square dielectric superstrate is placed above the DR which creates multiple reflection and enhance the gain up to ~8 dBi in both the frequencies without affecting other performances. The development stages are discussed in detail. The proposed design is demonstrated through prototype fabrication and characterization. This antenna can be used for X-band satellite communications.

scholarly journals Radiation Characteristics Enhancement of Dielectric Resonator Antenna Using Solid/Discrete Dielectric Lenses

2015 ◽  
Vol 4 (1) ◽  
pp. 1 ◽  
Author(s):  
H. A. E. Malhat ◽  
S. H. Zainud-Deen ◽  
W. M. Hassan ◽  
K. H. Awadalla
Keyword(s):  
Dielectric Constant ◽  
Dielectric Resonator ◽  
Dielectric Material ◽  
High Gain ◽  
Dielectric Resonator Antenna ◽  
Spherical Lens ◽  
Radiation Characteristics ◽  
Dielectric Resonator Antennas ◽  
Different Types ◽  
Dielectric Lenses

The radiation characteristics of the dielectric resonator antennas (DRA) is enhanced using different types of solid and discrete dielectric lenses. One of these approaches is by loading the DRA with planar superstrate, spherical lens, or by discrete lens (transmitarray). The dimensions and dielectric constant of each lens are optimized to maximize the gain of the DRA. A comparison between the radiations characteristics of the DRA loaded with different lenses are introduced. The design of the dielectric transmitarray depends on optimizing the heights of the dielectric material of the unit cell. The optimized transmitarray achieves 7 dBi extra gain over the single DRA with preserving the circular polarization. The proposed antenna is suitable for various applications that need high gain and focused antenna beam.

scholarly journals Circularly Polarized Hybrid Dielectric Resonator Antennas: A Brief Review and Perspective Analysis

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4100
Author(s):  
Rajasekhar Nalanagula ◽  
Naresh K. Darimireddy ◽  
Runa Kumari ◽  
Chan-Wang Park ◽  
R. Ramana Reddy
Keyword(s):  
Circular Polarization ◽  
Dielectric Resonator ◽  
Dielectric Resonator Antenna ◽  
Empirical Formulas ◽  
Circularly Polarized ◽  
Dielectric Resonator Antennas ◽  
New Ideas ◽  
Recent Trends ◽  
Review State ◽  
Associated Design

Recently, it has been a feasible approach to build an antenna, in view of the potential advantages they offer. One of the recent trends in dielectric resonator antenna research is the use of compound and hybrid structures. Several considerable investigations have been already underway showing quite interesting and significant features in bandwidth, gain, and generation of circular polarization. A critical review on a journey of circularly polarized hybrid dielectric resonator antennas is presented in this article. A general discussion of circular polarization and DR antennas are provided at the forefront. Evolution, significant challenges, and future aspects with new ideas in designing hybrid dielectric resonator antennas are indicated at the end of the review. State-of-the-art advances and associated design challenges of circularly polarized hybrid DR antennas and related empirical formulas used to find resonance frequency of different hybrid modes produced are discussed in this paper.

scholarly journals Rapid Prototyping of Bio-Inspired Dielectric Resonator Antennas for Sub-6 GHz Applications

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1046
Author(s):  
Valeria Marrocco ◽  
Vito Basile ◽  
Ilaria Marasco ◽  
Giovanni Niro ◽  
Luigi Melchiorre ◽  
...  
Keyword(s):  
Dielectric Resonator ◽  
Ground Plane ◽  
Dimensional Accuracy ◽  
Dielectric Resonator Antenna ◽  
Scattering Parameter ◽  
Dielectric Resonator Antennas ◽  
Close Proximity ◽  
Micro Features ◽  
Spiral Surface ◽  
Selection Of

Bio-inspired Dielectric Resonator Antennas (DRAs) are engaging more and more attention from the scientific community due to their exceptional wideband characteristic, which is especially desirable for the implementation of 5G communications. Nonetheless, since these antennas exhibit peculiar geometries in their micro-features, high dimensional accuracy must be accomplished via the selection of the most suitable fabrication process. In this study, the challenges to the manufacturing process presented by the wideband Spiral shell Dielectric Resonator Antenna (SsDRA), based on the Gielis superformula, are addressed. Three prototypes, made of three different photopolymer resins, were manufactured by bottom-up micro-Stereolithography (SLA). This process allows to cope with SsDRA’s fabrication criticalities, especially concerning the wavy features characterizing the thin spiral surface and the micro-features located in close proximity to the spiral origin. The assembly of the SsDRAs with a ground plane and feed probe was also accurately managed in order to guarantee reliable and repeatable measurements. The scattering parameter S11 trends were then measured by means of a Vector Network Analyzer, while the realized gains and 3D radiation diagrams were measured in the anechoic chamber. The experimental results show that all SsDRAs display relevant wideband behavior of 2 GHz at −10 dB in the sub-6 GHz range.

Dielectric resonator antennas based on high quality factor MgAl2O4 transparent dielectric ceramics

2020 ◽  
Vol 8 (42) ◽  
pp. 14880-14885
Author(s):  
Chao Du ◽  
Huan-Huan Guo ◽  
Di Zhou ◽  
He-Tuo Chen ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Quality Factor ◽  
Dielectric Resonator ◽  
Hot Isostatic Pressing ◽  
High Quality Factor ◽  
Dielectric Resonator Antenna ◽  
High Quality ◽  
Isostatic Pressing ◽  
Dielectric Resonator Antennas ◽  
Transparent Dielectric ◽  
Dielectric Ceramics

A transparent MgAl2O4 cylindrical ceramic, prepared via hot isostatic pressing, was used as a dielectric resonator antenna taking on good performance using the HE11δ fundamental modes.

scholarly journals Electrically Small Water-Based Hemispherical Dielectric Resonator Antenna

2019 ◽  
Vol 9 (22) ◽  
pp. 4848 ◽  
Author(s):  
Rasmus E. Jacobsen ◽  
Andrei V. Lavrinenko ◽  
Samel Arslanagić
Keyword(s):  
Free Space ◽  
Dielectric Resonator ◽  
Total Efficiency ◽  
Dielectric Resonator Antenna ◽  
Very High Frequency ◽  
Dielectric Resonator Antennas ◽  
Small Water ◽  
Dipole Resonance ◽  
Water Based ◽  
Interesting Candidate

Recently, water has been proposed as an interesting candidate for use in applications such as tunable microwave metamaterials and dielectric resonator antennas due to its high and temperature-dependent permittivity. In the present work, we considered an electrically small water-based dielectric resonator antenna made of a short monopole encapsulated by a hemispherical water cavity. The fundamental dipole resonances supported by the water cavity were used to match the short monopole to its feed line as well as the surrounding free space. Specifically, a magnetic (electric) dipole resonance was exploited for antenna designs with a total efficiency of 29.5% (15.6%) and a reflection coefficient of −24.1 dB (−10.9 dB) at 300 MHz. The dipole resonances were effectively excited with different monopole lengths and positions as well as different cavity sizes or different frequencies in the same cavity. The overall size of the optimum design was 18 times smaller than the free-space wavelength, representing the smallest water-based antenna to date. A prototype antenna was characterized, with an excellent agreement achieved between the numerical and experimental results. The proposed water-based antennas may serve as cheap and easy-to-fabricate tunable alternatives for use in very high frequency (VHF) and the low end of ultrahigh frequency (UHF) bands for a great variety of applications.

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

2018 ◽  
Vol 11 (6) ◽  
pp. 352 ◽  
Author(s):  
Sharif Ahmed Qasem ◽  
Tan Kim Geok ◽  
Mohamad Yusoff Alias ◽  
Ferdous Hossain ◽  
Naif Alsowaidi
Keyword(s):  
Dielectric Resonator ◽  
Dielectric Resonator Antenna ◽  
Gain Enhancement
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