Radiation characteristics of dielectric tube antennas
TL;DR: In this article, a study of the radiation characteristics of dielectric tube antennas is made with a possibility of its application in communications satellites, and it has been shown through a systematic analysis that a multimoded dielectrous tube shows a dip in the boresight region which is suitable for satellite antennas.
Abstract: A study of the radiation characteristics of dielectric tube antennas is made with a possibility of its application in communications satellites. It has been shown through a systematic analysis that a multimoded dielectric tube shows a dip in the boresight region which is suitable for satellite antennas.
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TL;DR: In this paper, a dielectric rod antenna with a gain of 16.7 dBi at 5.6 GHz has been proposed, where the length of this antenna is 2.3, which is considerably less compared to the conventional design.
Abstract: A novel design of dielectric rod antenna is presented here. Compared to the conventionally used tapered dielectric antennas, this configuration is capable of producing higher gain for a given length of the antenna. The design of an antenna using the new configuration having a gain of 16.7 dBi at 5.6 GHz is discussed. The length of this antenna is 2.3 , which is considerably less compared to the conventional design. The material used for the antenna is Teflon. Along with the detail simulated results, the measured results of the fabricated prototype antenna are also presented.
25 citations
04 Jun 2015
TL;DR: A submitted manuscript is the version of the article upon submission and before peer-review as mentioned in this paper, while a published version is the final layout of the paper including the volume, issue and page numbers.
Abstract: • A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers.
14 citations
TL;DR: In this article, the authors proposed a dielectric tube antenna design in the frequency range from 85 to 105 GHz for the use in the field of industrial radar level gauging for process automation industry.
Abstract: This paper concerns dielectric tube antenna design in the frequency range from 85 to 105 GHz for the use in the field of industrial radar level gauging for process automation industry The application is based on monostatic radar configurations, which thus demands for highly directive endfire antennas made of chemically inert dielectrics, such as polytetrafluoroethylene (PTFE) or polypropylene (PP) Herein, the antennas consist of solid and tubular waveguides with cylindrical cross sections as well as transitions among these sections In order to approach the promising theoretical directivity limits of thin-walled dielectric tubes at small aperture diameters, a fundamental HE11 mode-preserving waveguide transition forms the core element of the antenna This yields compact dielectric antennas with directivity levels of around 20 dBi By this means, a significant improvement in comparison to a circular metallic horn aperture of the same outer diameter as the radiating tube and a length reduction with regard to dielectric rod antennas is achieved Finally, prototypes of the proposed antennas are manufactured and verified by measurements
12 citations
Cites background from "Radiation characteristics of dielec..."
...The design efforts are focused on those HE/EH modes, because radially symmetric TE/TM-modes H/E are not suitable to design highly directive single-beam endfire antennas [19], as well as the dominant mode coupling from the fundamental TE HE mode into higher order modes is limited to hybrid noncylindrical symmetric HE/EH modes within metallo-dielectric or purely dielectric waveguide tapers, respectively [12], [20]–[22]....
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TL;DR: A slotted waveguide antenna, as part of a wireless battery system for a bone fixation implant called the Echidna Pin, which allows reception of RF power and eliminates the need for daily manipulations on an externally fitted device, or an operation on the body to change the length of the pin.
Abstract: A slotted waveguide antenna, as part of a wireless battery system for a bone fixation implant called the Echidna Pin is proposed. The antenna has 3-dB beamwidth of 65° in both E- and H-planes and its gain is 7.7 dBi at 21 GHz. The proposed antenna is conformal to the body of the pin and uses the pin as a waveguide. It is shown that placing a small Perspex plate after the waveguide launcher allows satisfactory return loss performance at all resonant frequencies as the length of the waveguide changes. The pin is used in distraction osteogenesis and allows the distance between the two surgically broken pieces of bone to be changed, thus expanding both soft tissue and bone volume simultaneously. The wireless battery system allows reception of RF power and eliminates the need for daily manipulations on an externally fitted device, or an operation on the body to change the length of the pin. It also makes the treatment significantly less painful for the patient and reduces the risk of infection.
11 citations
01 Jan 2010
TL;DR: In this paper, a compact assembled monopole antenna for dual-wideband operation has been proposed, and the antenna shows good dipole-like radiation characteristics with moderate gain over the operating bands, which is attractive for practical application in the WLAN/ WiMAX communication devices.
Abstract: Radiation characteristics of the constructed prototype were measured, and the radiation patterns in the - , - , and - planes at 2.5 GHz, 3.5 GHz and 5.5 GHz with the same polarization planes are plotted in Fig. 8(a)–(c). Simulated and measured results are good in agreement, and dipole-like radiation patterns are observed. The results show generally good omnidirectional radiations in the -plane (the plane). The variation of the radiation level at 2.5 and 3.5 GHz bands are less than 3 dB, while that at the 5.5 GHz band is still less than 5 dB. In addition, a low level of cross-polarization is observed—the difference in level between maximum copolarization and cross-polarization is approximately 20 dB. Radiation patterns at other frequencies in the 2.5 GHz, 3.5 GHz, and 5.5 GHz operating bands also show similar radiation patterns as plotted here, and stable radiation patterns across the 2.5 GHz, 3.5 GHz, and 5.5 GHz bands are achieved. The measured peak gains of the proposed antenna in the 2.2–2.8 GHz and 3.3–6 GHz bands are depicted in Fig. 9. The peak antenna gain in the 2.2–2.8 GHz band is about 2.2–2.6 dBi, while that in the 3.3–6 GHz band is about 1.9–4.1 dBi. IV. CONCLUSION A compact assembled monopole antenna for dual-wideband operation has been proposed. The antenna has a simple structure and is easy to be printed on FR4 substrate with small area of about 28 33 . In addition, although the antenna shows a simple structure and compact size, it can generate two broadbands centered at about 2.5 GHz and 5 GHz to cover the 2.4/5.2/5.8 GHz WLAN bands and the 2.5/3.5/5.5 WiMAX bands. The antenna shows good dipole-like radiation characteristics with moderate gain over the operating bands, which are attractive for practical application in the WLAN/ WiMAX communication devices.
4 citations
References
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TL;DR: In this article, the feasibility and practicality of improved performance from a stabilized antenna on a synchronous satellite by shaping the beam for optimum earth coverage has been shown and a relatively simple low-loss antenna that gives a good approximation to the ideal pattern is described.
Abstract: The feasibility and practicality of achieving improved performance from a stabilized antenna on a synchronous satellite by shaping the beam for optimum earth coverage is shown. Due to the difference in range and atmospheric attenuation from a synchronous satellite to various points on the earth, a conventional beam with maximum gain toward the center of the earth is inefficient because it has the highest gain where the least gain is required. Since the paths tangential to the earth are longest and since they traverse through more atmosphere, the antenna gain should be highest in this region and decrease to a minimum for the path normal to the earth (see Fig. 1). The flat portions at the edge of the "ideal" pattern allows for stabilization errors of the satellite. The ideal pattern has been calculated to give equal effective signal (including noise due to atmospheric attenuation and assumed preamplifier noise figures of the ground terminal and satellite) over the entire portion of the earth covered by the antenna beam. The ideal pattern is rotationally symmetrical and has the capability of dual orthogonal polarization. A relatively simple low-loss antenna that gives a good approximation to the ideal pattern is described. The antenna is a nine-horn array consisting of a large central horn surrounded by a ring of eight smaller horns. The central horn is multimoded to provide rotational symmetry and polarization purity. An optimum power division and relative phasing between the central and outer horns is made to give a pattern that closely approximates the ideal. Both theoretical and measured data are presented. Measured results confirm the beam shaping, rotational symmetry, polarization purity improved gain, and broad bandwidth expected from the array. A gain improvement of more than 2 dB over a well-designed conventional horn antenna has been demonstrated.
62 citations
01 Feb 1969
TL;DR: In this paper, the authors considered two aspects of dielectric-tube waveguide properties and derived expressions for power flow, energy storage and power loss using a perturbation method, giving expressions for group velocity and attenuation coefficient.
Abstract: Two aspects of dielectric-tube waveguide properties are considered. First, a mode designation is given which is consistent with one previously adopted for the dielectric rod, based on the behaviour of field components as well as on the sequence of solutions. Computed 2- and 3-dimensional field configurations are shown for the HE11 and EH11 modes. The second aspect is concerned with the propagation characteristics for all modes. Expressions are derived for power flow, energy storage and power loss using a perturbation method, giving expressions for group velocity and attenuation coefficient. It is indicated that a certain configuration of the dielectric-tube waveguide may be practicable at the higher microwave frequencies
44 citations
01 Mar 1967
TL;DR: In this article, a detailed application of the vector Kirchhoff formula to uniform cylindrical dielectric rods supporting the HE11 mode produces an expression for the far-field radiation pattern, which, when computed, gives good agreement with existing experimental data.
Abstract: Present-day theory of uniform cylindrical dielectric-rod antennas rests on the three theoretical treatments of Horton, Bouix and Fradin (leaky-guide theory), and on Brown's end-fire theory A digression on the general relationship between Schelkunoff's equivalence principle and the vector Kirchhoff formula reveals that these radiation formulas may only be applied to regions in which the vector potentials are known to satisfy the inhomogeneous wave equation On applying this axiom to the theories, all but Brown's are shown to be fallacious A detailed application of the vector Kirchhoff formula to uniform cylindrical dielectric rods supporting the HE11 mode produces an expression for the far-field radiation pattern, which, when computed, gives good agreement with existing experimental data The analysis allows for dielectric losses and can also be extended to nonuniform dielectric antennas with gradual tapers Fresnel interaction of the apertures and lens effects are considered Finally, some design recommendations for dielectric rod antennas are made
37 citations
"Radiation characteristics of dielec..." refers methods in this paper
...... the dielectric tube is chosen large enough to allow multiple mode propagation, The antenna is analyzed by formulating the characteristic equations for hybrid (HE,,, EH,,) and pure TE,, and TM,, modes to obtain the eigenvalues of the propagating modes, and then integrating the transverse fields over the aperture from r = 0 to using the vector Kirchoff formula [ 51 . Thus it is assumed that radiation occurs only from the end of the tube [ 4 ]....
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