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Journal ArticleDOI

Circularly Polarized Cylindrical Dielectric Resonator Antenna with Different Shapes Cross Slot

TL;DR: In this paper, a cross slot coupled cylindrical dielectric resonator antenna (CDRA) operating in the X-band (8GHz -12GHz) frequency range is studied.
Abstract: A cross slot coupled cylindrical dielectric resonator antenna (CDRA) operating in the X-band (8GHz -12GHz) frequency range is studied. The proposed CP designs are achieved by implementing a suitable cross slot on the ground plane (in the case of aperture coupled feed method), which results in excitation of two near degenerate orthogonal modes of near equal amplitudes and 90 ° phase difference. Attempts are made to change the geometry of slots ends to introduce a novel structure in order to achieve a better impedance bandwidth with an improved 3dB axial ratio (AR) bandwidth. It is found that the hourglass of cross slot has a great effect on the strength of coupling between the feed line and the dielectric resonator antenna. In simulation an impedance bandwidth of 46.15% and axial ratio bandwidth of 22% has been achieved with the above geometry. An improvement of 12% in impedance bandwidth and 11.2% in Axial ratio bandwidth is obtained over conventional rectangular cross slot. DOI: http://dx.doi.org/10.11591/ijece.v4i6.6484

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Citations
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Journal ArticleDOI

20 citations


Cites background from "Circularly Polarized Cylindrical Di..."

  • ...In this review article, the authors have segregated CP mechanism in terms of excitation of feeding techniques like microstrip line, coaxial probe, and aperture coupled feed, which will be helpful to the researcher to get the complete idea about the developments of particular excitation feeding method.(11-103)...

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  • ...Feeding techniques can be divided into single point feed and multi-point feed power divider, which plays an important role in generation of CP for the case of DRA over three and half decades.(11-76)...

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  • ...Detailed results are reported in terms of −10 dB impedance bandwidth, 3-dB AR bandwidth, realized gain, antenna efficiency, modes and excitation techniques in Table 4.(65-76) 3....

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Journal ArticleDOI
TL;DR: In this article, a circularly polarized conformal strip fed three-layer hemispherical dielectric resonator antenna (HDRA) with parasitic patch is analyzed theoretically and experimentally.
Abstract: In this work, a circularly polarized conformal strip fed three-layer hemispherical dielectric resonator antenna (HDRA) with parasitic patch is analyzed theoretically and experimentally. The effect of position of conformal strip and parasitic patch at first and third dielectric layer interfaces of three-layer HDRA is investigated for impedance and axial ratio (AR) bandwidths. The optimized permittivities of the layers and conformal strip and patch locations are found for three-layer HDRA to realize wide impedance and AR bandwidths. The antenna structure is analyzed using Green's function and method of moments approach. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:72–77, 2014

12 citations


Cites methods from "Circularly Polarized Cylindrical Di..."

  • ...The probe was placed outside the DRA avoiding necessity of drilling a hole [7,8] and is suitable for DRAs with vertical side wall such as cylindrical and rectangular geometries....

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  • ...However, the probe feed method allows easy excitation of circularly polarized (CP) fields by simply adding a 90 displaced probe in phase quadrature [7,8]....

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Journal ArticleDOI
TL;DR: In this paper, the authors investigated the performance comparison of three different unit cell configurations operating at 26 GHz for 5G applications and concluded that the optimum configuration to be deployed for the reflectarray unit element in order to fulfill the 5G requirements of a wide bandwidth is the cross hybrid DRA.
Abstract: This paper presents an investigation for the performance comparison of three different unit cell configurations operating at 26 GHz for 5G applications. The unit cells are cross shape dielectric resonator, cross microstrip patch and cross hybrid dielectric resonator. Verification of the comparison has been done by simulations using commercial Computer Simulation Technology Microwave Studio (CST MWS). The simulated results for reflection phase, slope variation, reflection loss and 10% bandwidth were analyzed and compared. The results indicate that the optimum configuration to be deployed for the reflectarray’s unit element in order to fulfill the 5G requirements of a wide bandwidth is the cross hybrid DRA. This configuration is a combination of cross DRA with cross microstrip patch as the parasitic element in order to tune the phase and provide a wide phase range with smooth variation slope. Cross hybrid DRA provided a wide phase range of 520° with 0.77 dB loss and 10% bandwidth of 160 MHz.

6 citations


Cites background from "Circularly Polarized Cylindrical Di..."

  • ...Besides as energy storage devices, dielectric resonators can be efficient radiators [13]....

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Journal ArticleDOI
TL;DR: In this paper, a three-port cascade de-embedding procedure was used to eliminate the dangling leg effect of a pseudomorphic High Electron Mobility Transistor (pHEMT) test structure without shielding.
Abstract: A three-port cascade de-embedding procedure utilized to accurately eliminate the source dangling leg effect of a pseudomorphic High Electron Mobility Transistor (pHEMT) test structure without shielding is presented. The measured device under test (DUT) is de-embedded by using the experimental and electromagnetic (EM) simulated data of dummy structures and their difference is below 1%. In addition, the extracted equivalent circuit parameters of the pHEMT exhibit the frequency-independent characteristics, indicating the dangling leg parasitic is removed accurately. These demonstrate that the presented three-port cascade de-embedding method is valid so that the de-embedded results of the pHEMT can reflect the physical electron trapping effect at microwave frequency. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:77–83, 2014

4 citations

Journal ArticleDOI
TL;DR: In this paper, a nested square-shape dielectric resonator (NSDR) has been designed and investigated for antenna applications in the microwave band, which has stable radiation characteristics in the broadside direction.
Abstract: In this paper, a nested square-shape dielectric resonator (NSDR) has been designed and investigated for antenna applications in the microwave band. A solid square dielectric resonator (SSDR) was modified systematically by introducing air-gap in the azimuth (ϕ-direction). By retaining the square shape of the dielectric resonator (DR), the well-known analysis tools can be applied to evaluate the performance of the NSDR. To validate the performance of the proposed NSDR in antenna applications, theoretical, simulation, and experimental analysis of the subject has been performed. A simple microstrip-line feeding source printed on the top of Rogers RO4003 grounded substrate was utilized without any external matching network. Unlike solid square DR, the proposed NSDR considerably improves the impedance bandwidth. The proposed antenna has been prototyped and experimentally validated. The antenna operates in the range of 12.34GHz to 21.7GHz which corresponds to 56% percentage bandwidth with peak realized gain 6.5dB. The antenna has stable radiation characteristics in the broadside direction. A close agreement between simulation and experimental results confirms the improved performance of NSDR in antenna applications.

3 citations


Cites background from "Circularly Polarized Cylindrical Di..."

  • ...In particular, the fundamental modes are the preferred choices for electric and magnetic dipole-like radiation characteristics [18-23]....

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References
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Journal ArticleDOI
TL;DR: In this paper, an aperture shape that gives significantly improved coupling for an aperture coupled microstrip antenna is described, which consists of the usual rectangular slot, augmented with loading slots at each end.
Abstract: An aperture shape that gives significantly improved coupling for an aperture coupled microstrip antenna is described. This ‘dogbone’ aperture consists of the usual rectangular slot, augmented with loading slots at each end. Measured data show an increase of more than three for the resonant input impedance of an antenna using the dogbone-shaped aperture, as compared with the input impedance of the same antenna with a rectangular slot of the same overall length. The field distributions of both slots are also measured, and compared.

271 citations

Journal ArticleDOI
TL;DR: In this article, the authors considered both linearly polarized (LP) and circularly polarized (CP) fields of a rectangular dielectric resonator antenna (DRA) and found that the fundamental TE/sub 111/ mode, together with the higher-order TE sub 113/mode can be used to design a wide-band LP DRA.
Abstract: A rectangular dielectric resonator antenna (DRA) was studied theoretically and experimentally. The rectangular DRA is excited by a strip, which is compatible with a coaxial probe. Both linearly polarized (LP) and circularly polarized (CP) fields of the antenna are considered. In previous studies of the LP rectangular DRA, only the fundamental TE/sub 111/ mode has received much attention. In this paper, it is found that the fundamental TE/sub 111/ mode, together with the higher-order TE/sub 113/ mode, can be used to design a wide-band LP DRA. The bandwidth of the dual-mode DRA can be over 40% for a conventional rectangular DRA with a simple feed. For the CP mode, a parasitic patch is attached on a side wall of the DRA to excite a degenerate mode. In both the LP and CP cases, the finite-difference time-domain (FDTD) method is used to analyze the problems. The results agree reasonably with measurements.

179 citations


"Circularly Polarized Cylindrical Di..." refers background in this paper

  • ...Primary conducted studies on DRA have been mainly focused on the linear polarization applications, bandwidth enhancing techniques such as excitation of higher order modes, combination of hybrid modes and array applications [3], [4]....

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Journal ArticleDOI
TL;DR: In this paper, a cylindrical dielectric resonator antenna (CDRA) has been examined with a view for using it as another radiating mode with broadside radiation patterns.
Abstract: A resonant mode (HEM12δ), other than those ( HEM11δ and TM01δ) conventionally excited and used in a cylindrical dielectric resonator antenna (CDRA) has been examined with a view for using it as another radiating mode with broadside radiation patterns. Excitation of the mode, being the most challenging aspect, has been discussed and resolved by employing an innovative technique. The proposed concept has been successfully verified and experimentally demonstrated for the first time. More than 8-dBi peak gain with excellent broadside radiation has been obtained from a prototype shaped from a commercially available low-loss dielectric material with relative permittivity 10.

132 citations


"Circularly Polarized Cylindrical Di..." refers background in this paper

  • ...Primary conducted studies on DRA have been mainly focused on the linear polarization applications, bandwidth enhancing techniques such as excitation of higher order modes, combination of hybrid modes and array applications [3], [4]....

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Journal ArticleDOI
TL;DR: In this article, a rectangular dielectric resonator antenna (DRA) centrally fed by a probe is investigated, and its operating mode is analogous to the TM011 mode of a cylindrical DRA.
Abstract: The rectangular dielectric resonator antenna (DRA) centrally fed by a probe is investigated. Its operating mode is analogous to the TM011 mode of a cylindrical DRA. The DRA radiates like an electric monopole, generating omnidirectional linearly polarized (LP) fields. Based on this LP design, a novel omnidirectional circularly polarized (CP) DRA is studied for the first time. Slots are introduced to the sidewalls of the DRA, exciting a degenerate mode for the generation of CP fields. To demonstrate the idea, an omnidirectional CP DRA was designed for WLAN (2.4-2.48 GHz) applications. The reflection coefficient, axial ratio (AR), radiation pattern, and antenna gain are studied, and reasonable agreement between the measured and simulated results is observed.

110 citations


"Circularly Polarized Cylindrical Di..." refers background in this paper

  • ...Circularly polarized (CP) DRA has received tremendous attention [5]-[10], mainly due to its ability to reduce the polarization mismatch....

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  • ...In designs [5], [6] make use of slots on the side walls of DRAs to excite degenerate modes, for generation of CP fields with 3dB AR bandwidth of 8....

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  • ...A Circular polarization (CP) operation was achieved through complex geometries of the DRA [5], [6] or through the attachment of parasitic patches [7], [8]....

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Journal ArticleDOI
TL;DR: In this paper, a wideband omnidirectional circularly polarized (CP) rectangular dielectric resonator antenna (DRA) is investigated in this communication, where an inclined slot, loaded by a parasitic conducting strip, is fabricated on each sidewall of the DRA.
Abstract: A wideband omnidirectional circularly polarized (CP) rectangular dielectric resonator antenna (DRA) is investigated in this communication. An inclined slot, loaded by a parasitic conducting strip, is fabricated on each sidewall of the DRA. The parasitic strips can excite a CP mode, which combines with the CP DRA mode to provide a wideband axial-ratio (AR) bandwidth of more than 25%. To fully utilize the increased AR bandwidth, the impedance bandwidth is also broadened by introducing a hollow cylinder at the center of the DRA. The hollow region is also used to accommodate a coaxial probe that excites the antenna. The reflection coefficient, AR, radiation pattern, antenna gain, and efficiency of the antenna are studied, and reasonable agreement between the measured and simulated results is observed. A parametric study was also carried out to characterize the proposed wideband CP omnidirectional antenna.

107 citations


"Circularly Polarized Cylindrical Di..." refers background in this paper

  • ...In designs [5], [6] make use of slots on the side walls of DRAs to excite degenerate modes, for generation of CP fields with 3dB AR bandwidth of 8....

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  • ...A Circular polarization (CP) operation was achieved through complex geometries of the DRA [5], [6] or through the attachment of parasitic patches [7], [8]....

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