New Technique of Dielectric Perturbation in Dielectric Resonator Antenna to Control the Higher Mode Leading to Reduced Cross-Polar Radiations
TL;DR: In this paper, a technique of dielectric perturbation in a DRA has been explored with specific application to filter out higher resonating modes causing unwanted radiations, which is especially conceived and conjectured for microstripfed cylindrical DRA (CDRA).
Abstract: A technique of dielectric perturbation in a dielectric resonator antenna (DRA) has been explored with specific application to filter out higher resonating modes causing unwanted radiations. This is especially conceived and conjectured for microstripfed cylindrical DRA (CDRA). Creating a protruded cavity in it filled with dielectric material of varying er is the primary mechanism. Effect of such perturbation has been experimentally demonstrated establishing air (e
r
= 1) as the simplest and most promising one for a specific application in weakening HEM
21δ
mode in it, recently identified as the source of cross-polar radiations. Physical insight into this new technique is also clarified. As much as 10 dB reduction in the principal plane cross-polarized values without affecting the primary radiations has been documented.
Citations
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TL;DR: In this article, a novel aperture coupled cylindrical dielectric resonator antenna (cDRA) is proposed for L1/L2 GPS bands (1.2/1.4 GHz) and WiMAX (2.5 GHz) applications.
Abstract: This letter presents the design and study of a novel aperture coupled cylindrical dielectric resonator antenna (cDRA). Unique aspects of the proposed antenna design are that proposed aperture can excite six different hybrid radiating modes (HEM11 δ , HEM11 δ +1, HEM12 δ -like, HEM12 δ , HEM13 δ , HEM14 δ ) in the cDRA; first time, quad-band quad-sense circular polarization is obtained in the dielectric resonator antenna structure; and radiation characteristics (broadsided) are almost same in all the frequency bands. These features make the proposed antenna structure relevant for L1/L2 GPS bands (1.2/1.5 GHz), CNSS, wireless LAN (2.4 GHz) as well as WiMAX (2.5 GHz) applications.
18 citations
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TL;DR: A comprehensive review of the state-of-the-art techniques and geometries which have been explored in the areas of dielectric Resonator Antennas (DRA) can be found in this article.
Abstract: This paper presents a comprehensive review of the state of art techniques and geometries which have been explored in the areas of Dielectric Resonator Antennas (DRA). With the evolution of first re...
4 citations
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TL;DR: In this article, the authors proposed a packaged active integrated dielectric resonator antenna-in-package (AIDRAiP) which consists of a hollow rectangular DRS antenna (RDRA), and internally packaged power amplifier and bandpass filter chips.
Abstract: This letter proposes a packaged active integrated dielectric resonator antenna-in-package (AIDRAiP), which consists of a hollow rectangular dielectric resonator antenna (RDRA), and internally packaged power amplifier and bandpass filter chips. First, a modified annular slot feeding structure is proposed to design an RDRA with a wide −10 dB bandwidth of 20.6%. Then, by integrating an amplifier and a filter chip into a hollow RDRA, a well-packaged AIDRAiP is developed with the circuits and antenna on the same side of a substrate. The size of the AIDRAiP is the same as that of the hollow RDRA. A −10 dB band of 2.38–2.52 GHz (determined by the bandpass filter) and a gain of about 15.0 dBi are achieved for the AIDRAiP prototype, with a reasonable agreement obtained between the measured and cosimulated results.
3 citations
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TL;DR: A three-dimensional dual-band dielectric resonator antenna, comprised of five rectangular RDR radiating elements, is proposed for wireless communication applications, which exhibits a gain of 7 dB in the lower band while 7.2 dB gain is obtained in the upper band.
Abstract: A three-dimensional dual-band dielectric resonator antenna, comprised of five rectangular dielectric resonator (RDR) radiating elements, is proposed for wireless communication applications. The presented multiple-input-multiple-output (MIMO)/diversity antenna system use TE
1δ1
Y
and HEM
2δ1
modes of the RDR antenna for the transmission/reception of data. The TE
1δ1
Y
mode covers the frequency range from 3.3 to 3.8 GHz, covering Wi-MAX, sub-6 GHz, and LTE (3.41-3.5 GHz uplink/3.51-3.6 GHz downlink) 5G application bands. The HEM
2δ1
mode covers Wi-Fi (5.725-5.875 GHz) and ITS 5.9 GHz (5.875-5.925 GHz) bands. The five RDR antenna elements are excited through coaxial feeds and are arranged in a cubical fashion to cover all directions, except -Z direction. The RDR elements are oriented and positioned to achieve a minimum correlation between the radiating elements. The proposed antenna exhibits a gain of 7 dB in the lower band while 7.2 dB gain is obtained in the upper band.
3 citations
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TL;DR: In this article, a 2×2 CDRA array with high gain and reduced cross-polarization has been proposed, which employs an on-board 180° phase inverter as a balun for differential feeding.
Abstract: This paper presents a compact novel 2×2 CDRA array with high gain and reduced cross polarization. By feeding the array elements differentially, the reduction of cross polarization and the enhancement of gain are achieved. The feeding network employs an on-board 180° phase inverter as a balun for differential feeding of array elements. The simulated results show that the proposed array achieves −10 dB impedance bandwidth of 5.78−5.9 GHz with a broadside radiation pattern having a peak realized gain of 11.07 dBi at 5.84 GHz. The cross-polarization levels in the boresight direction are −30.65 dB and −29.5 dB in YZ and XZ plane, respectively at 5.84 GHz. The proposed CDRA array is compact, making it suitable for portable devices.
2 citations
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References
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TL;DR: In this article, an experimental investigation of the radiation and circuit properties of a resonant cylindrical dielectric cavity antenna has been undertaken, and a simple theory utilizing the magnetic wall boundary condition is shown to correlate well with measured results for radiation patterns and resonant frequencies.
Abstract: An experimental investigation of the radiation and circuit properties of a resonant cylindrical dielectric cavity antenna has been undertaken. The radiation patterns and input impedance have been measured for structures of various geometrical aspect ratios, dielectric constants, and sizes of coaxial feed probes. A simple theory utilizing the magnetic wall boundary condition is shown to correlate well with measured results for radiation patterns and resonant frequencies.
1,286 citations
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TL;DR: Linearly and circularly polarized conformal strip-fed dielectric resonator antennas (DRAs) are studied in this article, where a parasitic patch is used to excite a nearly degenerate mode.
Abstract: Linearly and circularly polarized conformal strip-fed dielectric resonator antennas (DRAs) are studied in this article. In the latter case, a parasitic patch is used to excite a nearly degenerate mode. The hemispherical DRA, excited in its fundamental broadside TE111 mode, is used for the demonstration. In the analysis, the mode-matching method is used to obtain the Green's functions, whereas the method of moments is used to solve for the unknown strip currents. In order to solve the singularity problem of the Green's functions, a recurrence technique is used to evaluate the impedance integrals. This greatly increases the numerical efficiency. Measurements were carried out to verify the calculations, with good results.
Keywords:
circularly polarized antenna;
dielectric antennas;
mode-matching methods;
moment methods;
parasitic antennas;
resonance
844 citations
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TL;DR: In this article, a defected ground structure (DGS) pattern is proposed to reduce the cross-polarized (XP) radiation of a microstrip patch antenna, which is simple and easy to etch on a commercial microstrip substrate.
Abstract: A defected ground structure (DGS) is proposed to reduce the cross-polarized (XP) radiation of a microstrip patch antenna. The proposed DGS pattern is simple and easy to etch on a commercial microstrip substrate. This will only reduce the XP radiation field without affecting the dominant mode input impedance and co-polarized radiation patterns of a conventional antenna. The new concept has been examined and verified experimentally for a particular DGS pattern employing a circular patch as the radiator. Both simulation and experimental results are presented.
239 citations
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TL;DR: In this article, the authors investigated the effect of defected ground structure (DGS) on cross-polarized (XP) electric fields and associated radiations and found that the arc-DGS appears to be highly efficient in terms of suppressing XP fields.
Abstract: Experiments with probe-fed circular patches using conventional and defected ground planes flashed some interesting features relating to cross-polarized (XP) electric fields and associated radiations before the present authors. Those led to a series of new investigations for understanding the nature of XP fields and to deal with them using defected ground structure (DGS) for improved XP performance. In the first phase of investigation, the XP radiations of a probe-fed circular patch with conventional ground plane have been critically studied as a function of the radial probe location. Remarkably significant effect is experimentally demonstrated. New information about orthogonal resonant fields and its importance in designing an antenna is provided. In the second phase of investigation, limitations of dot-shaped DGS in reducing XP level are experimentally studied. As its improved variants, two new DGS geometries such as annular ring and circular arcs have been explored. The arc-DGS appears to be highly efficient in terms of suppressing XP fields. Suppression by 10-12 dB has been experimentally demonstrated. Each design has been experimented in both C- and X-bands to earn confidence on the measured data.
88 citations
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TL;DR: In this article, a linear array of rectangular dielectric resonator antennas (DRAs) fed by DIGs was designed to achieve a specific power distribution, the power coupled to each DRA is controlled by changing the spacing between the DRAs and the DIG.
Abstract: Design of a linear array of rectangular dielectric resonator antennas (DRAs) fed by dielectric image guide (DIG) is presented. Coupling between the DIG and the DRAs is predicted using the effective dielectric constant method. In order to achieve a specific power distribution, the power coupled to each DRA is controlled by changing the spacing between the DRAs and the DIG. Cross polarization reduction is achieved by wrapping a conducting strip around the middle of the DRA without affecting the co-polarized radiation pattern. The antenna is fabricated and tested. Good agreement between the measured and computed results is obtained.
69 citations
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