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.

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 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.

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 Pattern reconfigurable dielectric resonator antenna based on phased array switches

2018 ◽  
Vol 7 (2.29) ◽  
pp. 265
Author(s):  
Aymen Dheyaa Khaleel ◽  
Mohd Fais Mansor ◽  
Norbahiah Misran ◽  
Mohammad Tariqul Islam
Keyword(s):  
Dielectric Resonator ◽  
Ground Plane ◽  
Impedance Bandwidth ◽  
Total Efficiency ◽  
Dielectric Resonator Antenna ◽  
Term Evolution ◽  
Waveguide Model ◽  
Feeding Structure ◽  
Microstrip Feed

This study examines a cuboid dielectric resonator antenna with partial ground plane. The dielectric resonator of the antenna is designed with high permittivity, ɛr=30. The dimension used to design this cuboid dielectric resonator antenna was based on the dielectric waveguide model (DWM). Meanwhile, the feeding structure depends on the microstrip feed line that resides above the FR4 substrate. The significance of this study is to obtain a reconfigurable radiation pattern. Switches were used to operate the two array elements with phased control in order to obtain reconfigurable pattern, by controlling the switches, the results produced three different radiation patterns at 2.6 GHz with total efficiency 88%. Hence, this proposed antenna can be used for Long Term Evolution (LTE) of band 7 and band 38 with an impedance bandwidth of more than 200 MHz. This study was implemented in a CST Microwave Studio. 

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 Compact and Multiband MIMO Dielectric Resonator Antenna for Automotive LTE Communications

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Tzu-Ling Chiu ◽  
Laure Huitema ◽  
Olivier Pajona ◽  
Thierry Monediere
Keyword(s):  
Dielectric Resonator ◽  
Mimo Systems ◽  
Mimo System ◽  
Total Efficiency ◽  
Dielectric Resonator Antenna ◽  
Frequency Bands ◽  
Operation Conditions ◽  
Real Vehicle ◽  
Better Than ◽  
Good Agreement

A compact and multiband dielectric resonator antenna (DRA) designed for LTE automotive solutions is presented in this paper. The proposed MIMO system is located on the vehicle rooftop within a limited space of 120 mm × 70 mm × 65 mm. To cover all the LTE standard frequency bands used around the world, the antenna is matched around 790 MHz–860 MHz, 1700 MHz–2200 MHz, and 2500 MHz–2700 MHz frequency bands with a ∣S11∣ lower than −6 dB while presenting a minimum total efficiency of 50% with a maximum realized gain better than 1 dB on all these frequency bands. The DRA is then mounted and measured on a real vehicle rooftop in order to see its performances in real operation conditions. Finally, to improve both the quality and reliability of the wireless link, two DRAs are placed within a small area to reconfigure their radiation patterns on each frequency band. Measured performances, which are in good agreement with the simulated results, are used to validate if the antenna design is suitable for LTE MIMO systems to be integrated on an automotive. The MIMO system is evaluated using the envelope correlation coefficient (ECC), and the obtained value for the proposed antenna is lower than 0.25.

scholarly journals An Efficient Photomixer Based Slot Fed Terahertz Dielectric Resonator Antenna

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 876
Author(s):  
Xiaohang Li ◽  
Wenfei Yin ◽  
Salam Khamas
Keyword(s):  
Electric Field ◽  
Dielectric Resonator ◽  
Continuous Wave ◽  
High Gain ◽  
Substantial Improvement ◽  
Total Efficiency ◽  
Dielectric Resonator Antenna ◽  
Matching Efficiency ◽  
Surface Electric Field ◽  
Thz Power

A slot fed terahertz dielectric resonator antenna driven by an optimized photomixer is proposed, and the interaction of the laser and photomixer is studied. It is demonstrated that in a continuous wave terahertz photomixing scheme, the generated THz power is proportional to the 4th power of the surface electric field of photocondutive layer. Consequently, the optical to THz conversion efficiency of the proposed photomixer has an enhancement factor of 487. This is due to the fact that the surface electric field of the proposed photomixer with a 2D-Photonic Crystal (PhC) superstrate has been improved from 2.1 to 9.9 V/m, which represents a substantial improvement. Moreover, the electrically thick Gallium-Arsenide (GaAs) supporting substrate of the device has been truncated to create a dielectric resonator antenna (DRA) that offers a typical radiation efficiency of more than 90%. By employing a traditional coplanar strip (CPS) biasing network, the matching efficiency has been improved to 24.4%. Therefore, the total efficiency has been considerably improved due to the enhancements in the laser-to-THz conversion, as well as radiation and matching efficiencies. Further, the antenna gain has been improved to 9dBi at the presence of GaAs superstrate. Numerical comparisons show that the proposed antenna can achieve a high gain with relatively smaller dimensions compared with traditional THz antenna with Si lens.

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 A Water-Based Huygens Dielectric Resonator Antenna

2020 ◽  
Vol 1 ◽  
pp. 493-499
Author(s):  
Rasmus E. Jacobsen ◽  
Andrei V. Lavrinenko ◽  
Samel Arslanagic
Keyword(s):  
Dielectric Resonator ◽  
Dielectric Resonator Antenna ◽  
Water Based
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