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Journal ArticleDOI

A New Design Approach for a Hybrid Monopole to Achieve Increased Ultrawide Bandwidth [Antenna Designer's Notebook]

TL;DR: A design approach has been explored and successfully demonstrated to achieve an improved gain of a hybrid monopole maintaining its optimum achievable bandwidth and a three-segment composite dielectric ring resonator has been designed and fabricated.
Abstract: A design approach has been explored and successfully demonstrated to achieve an improved gain of a hybrid monopole maintaining its optimum achievable bandwidth. This challenge has been resolved based on the knowledge acquired in earlier investigations. A three-segment composite dielectric ring resonator (DRR) has been designed and fabricated. This, along with a vertical monopole, promises about 137% (5.4:1) matching bandwidth with consistent monopolelike radiation and 6-10-dBi gain over the entire band. Two sets of customized prototypes have been realized and experimentally validated to furnish the predicted characteristics in transmit and receive modes, both in frequency and time domain.
Citations
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Journal ArticleDOI
TL;DR: In this article, the authors proposed a hybrid monopole-DRA with a measured impedance bandwidth up to 148.6% (S11 < -10 dB) along with consistent monopolelike radiation patterns and peak gain of 7.14 dBi, which can be used in different ultra wideband wireless applications and as wideband electromagnetic interference (EMI) sensors.
Abstract: Conical and cylindrical dielectric resonator elements are vertically stacked and excited by a simple coaxial monopole. Compared to all earlier configurations, the proposed geometry significantly improves the impedance bandwidth. The ultrawideband response is enhanced due to the multiple resonances occurring by the suggested hybrid antenna. The footprint area of the antenna is only 63.6 mm2 or 25.44 x10-3λo 2 at the lowest operating frequency. The performance of the antenna is verified experimentally and numerically. Presented results show that the proposed hybrid monopole-DRA has a measured impedance bandwidth up to 148.6% (S11 < -10 dB) along with consistent monopole-like radiation patterns and peak gain of 7.14 dBi. With such properties, the proposed hybrid monopole-DRA can be used in different ultra-wideband wireless applications and as wideband electromagnetic interference (EMI) sensors.

14 citations


Cites result from "A New Design Approach for a Hybrid ..."

  • ...3 : 1 (75%) Three-segment composite DR fed by monopole [28] 2017 4....

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  • ...6 mm2 compared to the 425 mm2 reported in [28]....

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Journal ArticleDOI
TL;DR: In this paper, a magnetic dipole quasi-Yagi antenna based on a dielectric resonator (DR) is proposed, which can be differentially fed by the coplanar strip line (CPS).
Abstract: A magnetic dipole quasi-Yagi antenna based on a dielectric resonator (DR) is proposed in this letter. The dominate TE1δ1 mode of the rectangular DR is used as a magnetic dipole which can be differentially fed by the coplanar strip line (CPS). Thanks to the DR employment, the proposed antenna has several advantages such as compact size and flexible design which means the 3-D dimensions of the DR can be easily adjusted to cater for various applications. Meanwhile, the gain of the proposed DR quasi-Yagi antenna is higher than that of traditional electric dipole counterparts. Furthermore, since the DR driver is horizontally polarized, both the metal strip and DR can be used as a director for enhancing the end-fire gain. To verify the design concept, a prototype operating at the X-band is fabricated and measured. Good agreement between the simulated and measured results can be observed.

10 citations

References
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Book
26 Sep 2008
Abstract: Microwave dielectric materials play a key role in our global society with a wide range of applications, from terrestrial and satellite communication including software radio, GPS, and DBS TV to environmental monitoring via satellite. A small ceramic component made from a dielectric material is fundamental to the operation of filters and oscillators in several microwave systems. In microwave communications, dielectric resonator filters are used to discriminate between wanted and unwanted signal frequencies in the transmitted and received signal. When the wanted frequency is extracted and detected, it is necessary to maintain a strong signal. For clarity it is also critical that the wanted signal frequencies are not affected by seasonal temperature changes. In order to meet the specifications of current and future systems, improved or new microwave components based on dedicated dielectric materials and new designs are required. The recent progress in microwave telecommunication, satellite broadcasting and intelligent transport systems (ITS) has resulted in an increased demand for Dielectric Resonators (DRs). With the recent revolution in mobile phone and satellite communication systems using microwaves as the propagation media, the research and development in the field of device miniaturization has been a major challenge in contemporary Materials Science. In a mobile phone communication, the message is sent from a phone to the nearest base station, and then on via a series of base stations to the other phone. At the heart of each base station is the combiner/filter unit which has the job of receiving the messages, keeping them separate, amplifying the signals and sending then onto the next base station. For such a microwave circuit to work, part of it needs to resonate at the specific working frequency. The frequency determining component (resonator) used in such a high frequency device must satisfy certain criteria. The three important characteristics required for a dielectric resonator are (a) a high dielectric constant which facilitates miniaturization (b) a high quality factor (Qxf) which improves the signal-to-noise ratio, (c) a low temperature coefficient of the resonant frequency which determines the stability of the transmitted frequency.During the past 25 years scientists the world over have developed a large number of new materials (about 3000) or improved the properties of known materials. About 5000 papers have been published and more than 1000 patents filed in the area of dielectric resonators and related technologies. This book brings the data and science of these several useful materials together, which will be of immense benefit to researchers and engineers the world over. The topics covered in the book includes factors affecting the dielectric properties, measurement of dielectric properties, important low loss dielectric material systems such as perovskites, tungsten bronze type materials, materials in BaO-TiO2 system, (Zr,Sn)TiO4, alumina, rutile, AnBn-1O3n type materials, LTCC, ceramic-polymer composites etc. The book also has a data table listing all reported low loss dielectric materials with properties and references arranged in the order of increasing dielectric constant.Key Features:- collects together in one source data on all new materials used in wireless communication- includes tabulated properties of all reported low loss dielectric materials- in-depth treatment of dielectric resonator materials

855 citations


"A New Design Approach for a Hybrid ..." refers methods in this paper

  • ...Strontium titanate (SrTiO3), which has high permittivity, has been used as the filler, and polyethylene has been used as the polymer base for its low melting point of 160 °C [10]....

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Journal ArticleDOI
TL;DR: In this paper, the authors examined the multiple resonance phenomenon responsible for the ultra wideband response of the hybrid monopole-dielectric resonator antenna (DRA) and developed guidelines for designing the antennas for any specified frequency band.
Abstract: This letter examines in detail multiple resonance phenomenon responsible for the ultra wideband response of the hybrid monopole-dielectric resonator antenna (DRA). The physical insight gained by this investigation has lead to improved guidelines for designing the antennas for any specified frequency band. These simple guidelines are then verified using both simulated and measured data

119 citations


"A New Design Approach for a Hybrid ..." refers background or methods or result in this paper

  • ...The permittiv­ ity values vary over 3–7 to examine their composite effect on matching New Proposed Composite Mushroom-Shaped DRA (d) Pawn-Shaped DRA [6] (a) Stacked Conical DRR Larger Bandwidth [8] (b) First Hybrid Variant (Annular DRR) [2] (c)...

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  • ...The hybrid configuration of an elec­ tric monopole and a DRR has been known as an ultrawideband (UWB) monopole­antenna since [1] and [2]....

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  • ...Annular DRR ( r f = 10) loaded monopole [1]–[2] 1 100 4...

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  • ..., l c f l 4 0 67 ( ) eq f 3 3 = = which exactly corroborates the result in [2] showing [ ] ....

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Journal ArticleDOI
TL;DR: In this article, two geometries of dielectric ring resonator (DRR) have been investigated as new variants for designing ultrawideband hybrid monopole-DRAs with improved features.
Abstract: Two geometries of dielectric ring resonator (DRR) have been investigated as new variants for designing ultrawideband hybrid monopole-DRAs (dielectric resonator antennas) with improved features. They are simply hemispherical and conical in shape and have been implemented individually. Hybrid monopole-DRA is actually a combined configuration using a grounded monopole surrounded by a small DRR touching the same ground plane. Compared to an earlier version using cylindrical DRR of same dielectric material, the proposed ones promise for about 25% larger impedance bandwidth maintaining identical gain and radiation properties. As much as 126% impedance bandwidth with consistent monopole type radiation and 2-4 dBi peak gain has been demonstrated using a set of prototypes shaped from dielectric rod with er = 10. Physical insight in to the ultrawideband operation along with a comprehensive design guideline is presented.

77 citations


"A New Design Approach for a Hybrid ..." refers background in this paper

  • ...Conical and hemispherical DRA loaded monopole [7] 1 126 4–5...

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Journal ArticleDOI
TL;DR: In this paper, the performance of a T-shaped monopole antenna loaded with an annular dielectric resonator as an ultrawideband transmitting/receiving antenna is presented.
Abstract: This letter presents the performance of a T-shaped monopole antenna loaded with an annular dielectric resonator as an ultrawideband transmitting/receiving antenna. By adjusting the length of the monopole and load arm, a 10-dB bandwidth of 110% is achieved while maintaining monopole-like radiation pattern. The antenna factor of the same antenna, while used as electromagnetic interference (EMI) sensor is also presented for the desired and cross-polarized component of incident electric field. The results for antenna factor show an ultrawide bandwidth with the cross-polarization isolation better than 86 dB/m for the T-monopole/DRA as EMI sensor. The simulated result for return loss is verified with the measured data from a prototype antenna.

55 citations


Additional excerpts

  • ...Annular DRR loaded t-shaped monopole [4] 1 112 2...

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Journal ArticleDOI
TL;DR: In this article, a new pawn-shaped dielectric ring resonator fed by a simple quarter-wave monopole has been investigated as a new variant of the hybrid monopole-dielectric resonator antenna (DRA).
Abstract: A new pawn-shaped dielectric ring resonator (DRR) fed by a simple quarter-wave monopole has been investigated as a new variant of the hybrid monopole-dielectric resonator antenna (DRA). The new geometry, conceived intuitively, significantly improves the impedance bandwidth compared to all earlier versions reported in open literature. S11 < -10 dB occurring over 5.523 GHz has been experimentally demonstrated, indicating over 4:1 ratio bandwidth, i.e., more than 122% impedance bandwidth around the center of the band. The prototype has been shaped from a dielectric rod with epsivr =10. Such ultrawideband (UWB) response is caused by multiple resonances occurring by the hybrid monopole-DRA structure . These resonances are identified through several experimental and simulation studies. Uniform monopole-type radiation occurring over the entire bandwidth has been confirmed using measured and simulated results. The peak gain varies from 4 to 6 dBi as a function of frequency. Such useful properties can be successfully used to realize UWB monopole antennas for wireless communications and as wideband electromagnetic interference (EMI) sensors.

50 citations


"A New Design Approach for a Hybrid ..." refers background or methods in this paper

  • ...We have followed [6] in selecting the lower cutoff frequency, which is determined by the first reso­ nance f1 of the standalone monopole with length / / , l c f 4 4 11mm 1 m = = =...

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  • ...The clue to enhancing the gain is evi­ dent in Table 1: 1) The two­element DRR [6] offers maximum gain....

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  • ...r 0 65 mm = complies with the com­ mercially available standard radius of a subminiature version A probe pin [6]....

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  • ...But it is interesting to note that their gain values are confined with­ in 4–5 dBi, except in one case [6] in which it reaches up to 6 dBi....

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  • ...r3 f of the mushroom­shaped DRR introduces six monopole­like resonanc­ es, two additional resonances over and above those provided by earlier config­ urations [6], [8]....

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