Dielectric resonator

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Circularly Polarized Cross-Slot-Coupled Stacked Dielectric Resonator Antenna for Wireless Applications

Circularly Polarized Cross-Slot-Coupled Stacked Dielectric Resonator Antenna for Wireless Applications

Dielectric resonator antennas (DRAs) were first discovered in 1983 by Long et. al., and since then they have been widely studied [1]. There have been several works reported in literature to improve various parameters (impedance bandwidth, axial ratio bandwidth, gain etc.) of DRAs [2-20]. Their inherent features of high radiation efficiency & ease of excitation, compactness, and ability to obtain radiation patterns using different excitation modes offer much to an antenna application [2]. Furthermore, the shape of a DRA can be custom, resulting in favorable operating modes or polarizations. Also, the DRAs supporting circular polarizations have been studied and can be found in the literature. Traditionally, circular polarization is achieved using quadrature couplers and elaborate feed systems which can also be done with DRAs as well [3, 4].
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A Review on Dielectric Resonator Antenna and Its Analysis Setup

A Review on Dielectric Resonator Antenna and Its Analysis Setup

Dielectric Resonator Antenna: A dielectric resonator antenna has a dielectric layer and a conducting layer formed on a main surface of the dielectric layer. An electrical contact is formed on the main surface for connecting the dielectric layer to a transmission line for transferring a signal between the dielectric layer and the transmission line. The electrical contact is insulated from the conducting layer. A conducting strip is connected to the electrical contact and is on a side surface of the dielectric layer. The side surface is not on the same plane of the main surface. Rather, the side surface is perpendicular to the main surface of the dielectric layer. A dielectric resonator antenna (DRA) is a radio antenna mostly used at microwave frequencies and higher, that consists of a block of ceramic material of various shapes, the dielectric resonator, mounted on a metal surface, a ground plane. Radio waves are introduced into the inside of the resonator material from the transmitter circuit and bounce back and forth between the resonator
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Dielectric Resonator Antennas with Band Rejection and Frequency Reconfigurability

Dielectric Resonator Antennas with Band Rejection and Frequency Reconfigurability

In this paper, reconfigurability is added to dielectric resonator antennas, and two types of reconfigurable dielectric resonator antennas are presented. The first is an ultra wideband DRA with a reconfigurable band rejection or notch to help limit interference to different narrowband services operating inside the 3.2–5.1 GHz frequency range. The second is a DRA with reconfigurable resonance frequency suitable for different microwave applications and WiMAX applications. The reconfigurability of the notch and the resonance is achieved by rotation the Dielectric Resonator (DR) placed on the patch of the antenna, using a DC stepper motor connected to the DR. The characteristics of the designed antennas are investigated via HFSS and experimentally verified.
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Transparent Dielectric Resonator Reflectarray with Bottom-Loading Strip

Transparent Dielectric Resonator Reflectarray with Bottom-Loading Strip

Microstrip patch [1] has become a popular resonator for designing the planar reflectarray because it is planar and simple in structure. A patch resonator with variable size or length is found to be able to introduce phase shift for reflectarray. Nevertheless, conductive and surface wave losses of the patch can be a concern at millimeter wave ranges [2]. It was first shown by Long et al. [3] that the dielectric resonator (DR) can be made an efficient antenna. Since then, the dielectric resonator antenna (DRA) has been extensively explored for various applications because of its advantages such as low loss, wide bandwidth, compact size, and light weight [4, 5]. The use of DR can scale down the antenna size by roughly a factor of 1 / √ ε r , where ε r is the dielectric constant of the DR [6].
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A Novel and Accurate Method for Designing Dielectric Resonator Filter

A Novel and Accurate Method for Designing Dielectric Resonator Filter

For the new filter design, design equations for dielectric resonator filter have been used. The first step is choosing an appropriate filter type compatible with the application and calculating its parameters. In this approach, we have chosen 3rd order Chebyshev filter with 2% bandwidth.

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A TE11 Dual-Mode Monoblock Dielectric Resonator Filter

A TE11 Dual-Mode Monoblock Dielectric Resonator Filter

Dielectric resonator filters have been widely used in mobile communication and space applications due to their relatively small size, high unloaded Q-factor and stable thermal and mechanical performance. Further size reduction can be achieved by exploiting multi-mode degenerate resonances in a dielectric resonator. Since Cohn and Fiedziuszko [1] first introduced the possibility of realizing high Q-factor filters using the single mode, TE 01 and TM 01 , and dual-mode,

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A High Gain Dielectric Resonator Loaded Patch Antenna

A High Gain Dielectric Resonator Loaded Patch Antenna

Abstract—A dielectric resonator loaded patch antenna excited by a coaxial cable is proposed in this paper. The results from measurement show a wide impedance bandwidth of 57.1% from 3.75 GHz to 6.75 GHz and a peak gain of 11.5 dB at the center of frequency band with an average gain improvement of 3 dB over the frequency band in comparison with the common dielectric resonator antennas. These results are in good agreement with those obtained by the computer simulations. A simple study of the antenna shows that the aperture size increase is the cause of gain enhancement. A theoretical model based on the simulated gain results of reference antenna and its equivalent aperture is presented for the proposed antenna structure with good agreement with simulation and measurement results. The advantages of the proposed antenna are high gain with broad bandwidth, and low fabrication cost in comparison to other types of high gain DRAs having narrow bandwidths and complex structures.
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Design of a Dual-Band MIMO Dielectric Resonator Antenna with Pattern Diversity for WiMAX
 and WLAN Applications

Design of a Dual-Band MIMO Dielectric Resonator Antenna with Pattern Diversity for WiMAX and WLAN Applications

the dielectric resonator with and without cylindrical air-gap as shown in Figure 3. Figure 3(a) shows how the field intersects through both the ports (indicated by red circle) which causes poor isolation at both the bands. When the cylindrical air-gap is introduced, field through both the ports is affected at the interface of air-gap, due to the difference of permittivities, as shown in Figure 3(b). This results in improvement in isolation. Figure 3(c) shows a similar effect in the presence of copper strips at the corner of the radiator.

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Design of Rectangular Dielectric Resonator Antenna Fed by Dielectric Image Line with a Finite Ground Plane

Design of Rectangular Dielectric Resonator Antenna Fed by Dielectric Image Line with a Finite Ground Plane

In this paper a single RDRA excited by a DIL through a slot was numerically investigated by HFSS. The best ground plane width for maximum gain with a broadside radiation pattern was obtained. Results show that 7.7 dB gain at 10 GHz was obtained for 100 mm of ground plane width. Moreover, to increase antenna gain four sidewalls were added and maximum gain of 10.4 dB at 10.4 GHz was obtained which is 2.7 dB higher than the gain in case of structure without them. To reduce back- ward radiation, a reflector was placed at the back of the antenna structure. The results show that adding the re- flector lead to reduce the backward radiation around 10 dB in E-plane, especially. Also, the effects air gap between dielectric resonator and ground plane on the
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Investigation of a Cross-Slot-Coupled Dual-Band Circularly Polarized Hybrid Dielectric Resonator Antenna

Investigation of a Cross-Slot-Coupled Dual-Band Circularly Polarized Hybrid Dielectric Resonator Antenna

Abstract—In this paper, a cross-slot-coupled dual-band circularly polarized (CP) hybrid dielectric resonator antenna (DRA) is presented. The design concept is based on using a cross-slot as both a feeding structure of the DRA and an effective radiator. Full wave simulation is used to verify the proposed design concept in this paper. A prototype antenna is designed, fabricated, and measured. Good agreement is obtained between the simulated and measured results.

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Measurable Dielectric Permittivity Range for TE and TM Modes in a Shielded Dielectric Resonator

Measurable Dielectric Permittivity Range for TE and TM Modes in a Shielded Dielectric Resonator

Hertzian potentials have been used to solve different electromagnetic problems: in the study of the properties of aperture array systems [1], non-linear waveguides [2], Green’s functions for multilayered media [3] and electromagnetic wave interaction with nanodevices [4]. They have also been applied for the determination of TE and TM modes of circular cylindrical cavities using magnetic-type and electric-type Hertzian potentials res- pectively [5]. Figure 1 shows the case of a cylindrical dielectric resonator enclosed by a metal shield, where b is the radius of the outer cylinder, a is the inner resonator radius and d is the height (length of the structure). The configuration can be regarded as a cylindrical waveguide enclosing a central sample of radius a, and terminated by perfectly conducting planes. The general solution for the axial E field in TM modes was discussed in [6], proposing a general solution for the axial E field for TM modes.
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Dielectric resonator reflectarray antenna in Ku-Band

Dielectric resonator reflectarray antenna in Ku-Band

The new reflectarray antenna design consists of dielectric resonator antenna (DRA) unit-cell loaded with alphabet shape slot. Due to the interesting features of DRA such as low loss, broad bandwidth small mutual coupling effect and higher radiation efficiency, thus DRA has become the main subject of the study. Meanwhile, in order to excites the magnetic fields in the DRA [9], alphabet shape slot is loaded as the main frequency tunable for the DRA. Alphabet shape slot is chosen due to the various geometries.

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A Wideband Trapezoidal Dielectric Resonator Antenna with Circular Polarization

A Wideband Trapezoidal Dielectric Resonator Antenna with Circular Polarization

Abstract—A new design of a circularly-polarized (CP) trapezoidal dielectric resonator antenna (DRA) for wideband wireless application is presented. A single-layered feed is used to excite the trapezoidal shaped dielectric resonator to increase resonant frequency and axial ratio. Besides its structure simplicity, ease of fabrication and low-cost, the proposed antenna features good measured impedance bandwidth, 87.3% at 4.21 GHz to 10.72 GHz frequency bands. Moreover, the antenna also produces 3-dB axial ratio bandwidth of about 710 MHz from 5.17 GHz to 5.88 GHz. The overall size of DRA is 21 mm × 35 mm, which is suitable for mobile devices. Parametric study and measurement results are presented and discussed. Very good agreement is demonstrated between simulated and measured results.
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Study of dielectric Resonator optical antenna present past and future

Study of dielectric Resonator optical antenna present past and future

Nanoantenna has high level radiationelements. Optical antenna has unique type of RF strategies to optical or plasmonic realm. Optical DRA has many uncertainties with unique properties with high level approaches Engineered materials or nonmaterials. The function of optical antenna with uses particles like gold particle which has widely used for exploited to achieve every small bit size of context of optical antenna structures ,element play main reasons why these elements well works with THZ Frequency . The dielectric Resonator optical antennahas some new design to fabricate new and high level configurable superior conductor which general to improve its potential performance with high level enhancement . The impedance value of Antenna System main integration for nano or micro level communication .The optical antenna has main aim to increase antenna Gain with Low losses. Its design is very usefull because its feeding technique has unique model Expansion which can expansion which can express through low losses of conducting radiation element. The wireless communication Antenna Network design has been interest for researcher from the past few decades due to design and manipulation .The demonstration of optical DRA antenna has special direction as well as control on complex and analytic algorithms. Which is able to control at THZ, GHZ Scale. Although opticalAntenna wavelength propogation providing high and advance level technology for nanoplasmonicdevices.The fabrication process may be describe and explore design that increase the spontaneous emission rate with high level magnitude to improve optical antenna working range depend upon relationship between metalicintraction with nanoscale or THZ Scale .nowdays we are allowing our technology. The dielectric resonator antenna has encouraging develoment for different bands or THZ band have taken on interest .In terms of optical nanoantenna works in to integrate the Antenna with DRA Termed. The permittivity of optical DRA antenna proves the element to be suitable antenna array Application. The antenna gain enhancement depending on increase bandwidth which introduced multiple resonances and minimizing its dimensions. The radiation pattern of any antenna determined by far field radiation or transformation of magnetic current .The optical DRA Frequencies patterns and efficiency of Antenna model show similar radiation patterns .it has lower dielectric material used for made-up Antenna material then achieved Antenna higher order of increasing impedance bandwidth.
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Study of dielectric Resonator optical antenna present past and future

Study of dielectric Resonator optical antenna present past and future

12. Anand Mohan, Study of Plasmonic Nano-Materials for Surface enhanced Localized Surface Plasmon Resonance Spectroscopy (LSPR) &Their Applications for Optical Antennas,Indian Journal of Agriculture and Allied Sciences, ISSN 2395-1109,2015;1(4) 13. Anand Mohan, “Cylindrical Dielectric Resonator Optical Antenna (CDROA) & its

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Dual Band Dielectric Resonator Antenna for Wireless Application: Review

Dual Band Dielectric Resonator Antenna for Wireless Application: Review

Yao-Dong et al. [3] presented a new single-fed wide dual-band circularly polarized (CP) dielectric resonator antenna (DRA).. The antenna in this article the simulated and measured consequences are shown after completion. In the current age of cellular communication, the research is widely focused on dual polarized DRA because these radiators are insensitive to the orientation and multipath interferences between transmitter and receiver antennas. Numerous researchers have been established various techniques to create CP characteristics in DRA like diversified feeding mechanism and shapes of DRA (semi-eccentric DRA, staked rectangular DRA as well as hybrid cylindrical DRA). Though the beneath rectangular aperture the DRA is excited and its HE 111 and
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Effective Wave Guide Model (Ewgm) for Resonant Frequency Computation of Rectangular Dielectric Resonator Antennas

Effective Wave Guide Model (Ewgm) for Resonant Frequency Computation of Rectangular Dielectric Resonator Antennas

11. Antar, Y. M. M., D. Cheng, G. Seguin, B. Henry, and M. G. Keller, “Modified waveguide model (MWGM) for rectangular dielectric resonator antenna (DRA),” Microwave and Optical Technology Letters, Vol. 19, No. 2, 158–160, Oct. 5, 1998. 12. Neshati, M. H. and Z. Wu, “The determination of the resonance frequency of the T E Y 111 mode in a rectangular dielectric resonator for antenna application,” 11th International Conference on Antenna and Propagation, 2001, Vol. 1, No. 480, 53–56, 2001. 13. Gurel, C. S. and H. Cosar, “Efficient method for resonant fre-
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Embedded Dual band Cylindrical Dielectric Resonator Antenna

Embedded Dual band Cylindrical Dielectric Resonator Antenna

The dielectric resonator antennas (DRAs) have attracted wide attentions in various applications, as armored filters or oscillators [1,2], They offer several advantages in terms of high radiation efficiency and Q factor. Indeed, when a resonator is placed in a cavity, it presents a high quality factor, which allows the realization of a highly selective filter.

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Compact Band-Notched UWB Dielectric Resonator Antennas

Compact Band-Notched UWB Dielectric Resonator Antennas

Abstract—Novel compact ultra-wideband (UWB) rectangular stacked dielectric resonator antennas (DRAs) with band-notched characteristics are proposed. The DRAs are designed to cover the FCC band (3.1–10.6 GHz) and have very compact sizes, due to the shorting conductor. Printed dipoles that are placed on one side of the dielectric resonator will resonate and generate band notches within the ultra-wide operating band. Simulations and measurements confirm the validation of the design principle.

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Broadbeam Coplanar-Parasitic Rectangular Dielectric Resonator Antenna

Broadbeam Coplanar-Parasitic Rectangular Dielectric Resonator Antenna

Figure 2 presents the variation of mode frequencies with varying height H for a CoP-RDR. As can be seen from Figure 2, there is no variation in Mode-I frequency with changing dielectric resonator height H. The plot points towards an important trait that the antenna yields broadbeam in two planes at frequencies between Mode-I and Mode-II resonances. Therefore, Mode-I frequency provides an initial marker for successfully identifying the broadbeam frequencies. The next step will be to specify the DR height optimum for broadbeam operation. However, using the calculation for single element RDR, the optimum height has already been pointed out to be 18 mm, and the antenna dimensions have a consistent relation with Mode-I frequency wavelength because it does not change with varying DR height. The optimum DR height is found to be 0.32λ g . Once the height is identified, the exact frequency band at
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