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Journal ArticleDOI

Bandwidth Enhancement of Monopole UWB Antenna With New Slots and EBG Structures

TL;DR: In this paper, two methods in terms of bandwidth broadening are proposed and compared for monopole slot ultrawideband (UWB) antennas supporting mobile terminal applications, and the comparison of gain characters as well as the radiation patterns are discussed at the bands of interest.
Abstract: Two methods in terms of bandwidth broadening are proposed and compared for monopole slot ultrawideband (UWB) antennas supporting mobile terminal applications. The original antenna has a bandwidth of 9.27 GHz (1.73-11 GHz) that covers PCS1900, UMTS2000, TD-SCDMA, WLAN 802.11b/g or Bluetooth, LTE, WiMAX, and UWB frequency range. In this letter, by cutting two new slots on the ground plane, the antenna can expand its bandwidth to 9.33 GHz (1.67-11 GHz) that is available at extra DVB-H, DCS1800 services. Meanwhile, the bandwidth of the antenna with conventional mushroom-type electromagnetic band-gap (CMT-EBG) embedded on both sides of a 50- Ω microstrip line can be enhanced to 9.47 GHz (1.53-11 GHz) with the extra GPS covered. The largest impedance bandwidth of 151% can be obtained. Moreover, the comparisons of gain characters as well as the radiation patterns are discussed at the bands of interest. It is illustrated that the gain of the antenna based on CMT-EBG is higher than other two cases except to the range of 5.19-5.93 GHz and the radiation patterns are basically identical. The antennas are fabricated on FR4 substrate, and the deviations between measured results and simulated results are discussed.
Citations
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Journal ArticleDOI
TL;DR: Comparative parameters in terms of electrical dimension, bandwidth, Fractional bandwidth (FB) and Bandwidth Dimension Ratio (BDR) are presented which introduces the researchers to the technical challenges in the design of a compact wideband antenna.
Abstract: With the recent advancement and phenomenal progress in the field of wireless communication technology, there is an ever increasing demand for high data rates and improved quality of service for the end users. In recent times various designs of super wideband antennas (SWB) fulfilling diverse objectives have been proposed for modern wireless networks. Design of compact and wideband antenna for high speed, high capacity, and secure wireless communications presents a challenging task for designers of fixed and mobile wireless communication systems. In this paper, a comprehensive review concerning antenna structures and the technologies adopted for design and analysis of SWB antennas for wireless application is reported. Comparative parameters in terms of electrical dimension, bandwidth, Fractional bandwidth (FB) and Bandwidth Dimension Ratio (BDR) are presented which introduces the researchers to the technical challenges in the design of a compact wideband antenna. This paper contributes to present existing novel approaches along with its adequacy in the design techniques. This review exercise will assist the researchers with valuable support for further research and to achieve better impedance matching, wide bandwidth, high gain and good efficiency along with well directive radiation characteristics.

59 citations


Cites methods from "Bandwidth Enhancement of Monopole U..."

  • ...Comparative analysis of different proposed antennas has been done in terms of Bandwidth dimension ratio (BDR) which illustrates the compactness and wideband properties of any proposed antenna [11, 23]....

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Journal ArticleDOI
TL;DR: In this paper, a simple broadband planar monopole microstrip patch antenna with curved slot and partial ground plane is proposed for 2.4/5.8 GHz WLAN bands, 2.5/3.5 GHz WiMAX bands, and other wireless communication services.
Abstract: This paper presents a simple broadband planar monopole microstrip patch antenna with curved slot and partial ground plane. The proposed antenna is designed and fabricated on commercially available FR4 material with er = 4.3 and 0.025 loss tangent. Bandwidth enhancement has been achieved by introducing a curved slot in the patch and optimizing the gap between the patch and the partial ground plane and the gap between the curved slot and the edge of the patch. Simulated peak gain of the proposed antenna is 4.8 dB. The impedance bandwidth (defined by 10 dB return loss) of the proposed antenna is 109% (2–6.8 GHz), which shows bandwidth enhancement of 26% as compared with simple monopole antenna. The antenna is useful for 2.4/5.2/5.8-GHz WLAN bands, 2.5/3.5/5.5-GHz WiMAX bands, and other wireless communication services. Measured results show good agreement with the simulated results. The proposed antenna details are described and measured/simulated results are elaborated.

37 citations


Cites background from "Bandwidth Enhancement of Monopole U..."

  • ...A pair of parasitic patches, curved slots, and EBG structure has been introduced in a slot antenna for bandwidth enhancement [14, 15]....

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Journal ArticleDOI
TL;DR: In this article, a two-semicircular slot-loaded monopole with a staircase ground structure is presented for automotive applications, which is a novel optically transparent multiple-input multiple-output (MIMO) antenna.
Abstract: A novel optically transparent multiple-input multiple-output (MIMO) antenna for automotive applications is presented in this article. The MIMO antenna consists of a two-semicircular slot-loaded monopole with a staircase ground structure. It is developed on a glass substrate with dimension $29\times50$ mm2. The fluorine-doped tin oxide and indium-doped tin oxide (ITO) are used as the conductive layers on the bottom and top of the substrate with sheet resistance $4~\Omega $ /sq and $10~\Omega $ /sq, respectively. The fabricated antenna has an optical transmittance greater than 72%; hence, it can be placed on the glass surface of the automotive. The measured results show that the proposed antenna exhibits a good impedance matching over a frequency of 2.4–11 GHz with isolation greater than 20 dB and a peak realized gain of 2 dBi, which is suitable for ultrawideband (UWB) automotive applications.

36 citations

Proceedings ArticleDOI
01 Sep 2016
TL;DR: A parametric study of the effects of different size and shapes of slots on the performance characteristic of UWB Microstrip antenna using a centrally loaded rectangular slot would be of a great interest in the designing of compact antennas for wireless communications operating in UWB.
Abstract: This research paper presents a simple design consideration of Ultra-Wide Band (UWB) Microstrip antenna using a centrally loaded rectangular slot. An analytical study of the effects of different size and shapes of slots on the performance characteristic of UWB Microstrip antenna is presented. Insertion of slot and the changes in dimension of ground plane has a high impact on the behavior and parameter of the patch antenna. To improve the bandwidth of the patch antenna, proper insertion of slot on the planer patch structure has been used. In the paper 12mm by 15.6 mm rectangular patch antenna carved on FR4 substrate is presented. Both the simulated and the measured result show the operation of the antenna in the entire UWB range. This parametric study would be of a great interest in the designing of compact antennas for wireless communications operating in UWB.

31 citations

Journal ArticleDOI
TL;DR: In this article, a corner truncated broadband patch antenna with circular slots is presented, and the proposed antenna is fabricated on 14 * 14 * 1.57 mm3 Rogers RT5870 substrate.
Abstract: In this communication, a corner truncated broadband patch antenna with circular slots is presented. The proposed antenna is fabricated on 14 * 14 * 1.57 mm3 Rogers RT5870 substrate (er = 2.33 and loss tangent of 0.0012) and a 50-Ω SMA connector is used for excitation. Bandwidth enhancement has been reported due to cutting of two circular slots and truncating the corners of the square patch, which gives rise to mode splitting phenomenon and better impedance matching. Simulated results show that the impedance bandwidth (S11 < 10 dB) of the proposed antenna is 19% (10.8–13.2 GHz). Measured results are in good agreement with the simulated results. The fractional bandwidth of the proposed antenna has enhanced from 8.5 to 19% as compared to the simple patch antenna, showing an enhancement of 123%. The peak gain of the proposed antenna is 7 dB. The antenna finds application in satellite communication, radar communication, and other alleged wireless communication services. Details and comparison of the proposed antenna with simple patch antenna have been described. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:845–849, 2015

29 citations

References
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Journal ArticleDOI
TL;DR: In this paper, a new type of metallic structure has been developed that is characterized by having high surface impedance, which is analogous to a corrugated metal surface in which the corrugations have been folded up into lumped-circuit elements and distributed in a two-dimensional lattice.
Abstract: A new type of metallic electromagnetic structure has been developed that is characterized by having high surface impedance. Although it is made of continuous metal, and conducts dc currents, it does not conduct ac currents within a forbidden frequency band. Unlike normal conductors, this new surface does not support propagating surface waves, and its image currents are not phase reversed. The geometry is analogous to a corrugated metal surface in which the corrugations have been folded up into lumped-circuit elements, and distributed in a two-dimensional lattice. The surface can be described using solid-state band theory concepts, even though the periodicity is much less than the free-space wavelength. This unique material is applicable to a variety of electromagnetic problems, including new kinds of low-profile antennas.

4,264 citations


"Bandwidth Enhancement of Monopole U..." refers background in this paper

  • ...47 GHz can be obtained by embedding the conventional mushroomtype electromagnetic band-gap (CMT-EBG) [11] on the original monopole slot UWB antenna, which is available for most wireless communication services....

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Journal ArticleDOI
TL;DR: In this paper, an efficient approach for designing ultrawideband (UWB) antennas in the form of planar monopoles of elliptical and circular shape is described and their validity is tested via electromagnetic analysis and measurements.
Abstract: An efficient approach is described for designing ultrawideband (UWB) antennas in the form of planar monopoles of elliptical and circular shape. To avoid the time consuming trial-and-error approach presented in other works, simple design formulas for this type of radiators are described and their validity is tested via electromagnetic analysis and measurements. Full electromagnetic wave investigations are performed assuming three types of substrates with wide range of dielectric constant and thickness. The presented results show that the proposed method can be applied directly to design planar antennas that cover the ultrawide frequency band from 3.1 GHz to more than 10.6 GHz. Four types of monopole antennas were manufactured using RT6010LM substrate and their operation was tested in terms of return loss, radiation pattern characteristics, gain, and time domain response. The developed antennas feature UWB behavior with near omnidirectional characteristics and good radiation efficiency. The time domain transmission tests between two identical elements show that the manufactured circular monopoles offer better performance in terms of distortionless pulse transmission than their elliptically shaped counter parts. These antennas are also assessed in terms of fidelity factor. The manufactured antennas show a high fidelity factor which is more than 90% for the face-to-face orientation.

230 citations


"Bandwidth Enhancement of Monopole U..." refers background in this paper

  • ...6 GHz) [5], which can be only operated at higher wireless services....

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  • ...Another promising wideband antenna is the monopole antenna [3]–[5]....

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  • ...Much research on the designs of UWB monopole antennas has already appeared for wireless communication systems [4], [5]....

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Journal ArticleDOI
TL;DR: In this article, a new internal multiband mobile phone antenna formed by two printed monopole slots of different lengths cut at the edge of the system ground plane of the mobile phone is presented.
Abstract: A new internal multiband mobile phone antenna formed by two printed monopole slots of different lengths cut at the edge of the system ground plane of the mobile phone is presented. The antenna can generate two wide bands centered at about 900 and 2100 MHz to cover the GSM850/GSM900/DCS/PCS/UMTS bands and the 2.4-GHz WLAN band. Further, the antenna has a simple planar structure and occupies a small area of only. It is also promising to bend the antenna into an L shape to reduce its volume occupied inside the mobile phone. Good radiation characteristics are obtained over the two wide operating bands.

227 citations


"Bandwidth Enhancement of Monopole U..." refers background in this paper

  • ...One can cut slots on the system ground plane [7], [8]....

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Journal ArticleDOI
TL;DR: In this paper, a new approach is proposed to reject certain bands within the passband of an ultra-wideband planar monopole antenna, which utilizes a mushroom-type electromagnetic-bandgap (EBG) structure.
Abstract: A new approach is proposed to reject certain bands within the passband of an ultra-wideband planar monopole antenna. The proposed approach that utilizes a mushroom-type electromagnetic-bandgap (EBG) structure is proven to be an effective way for band-notched designs. The approach has many advantages, such as notch-frequency tunability, notch-band width controllable capacity, efficient dual-notch design, and stable radiation patterns. Several design examples using conventional mushroom-type EBG and edge-located vias mushroom-type EBG are presented. The examples exhibit good bandstop characteristics to reject the wireless local-area network interference bands (5.2- and 5.8-GHz bands). Besides, the causes that lead to the discrepancies between the simulations and measurements are discussed.

180 citations


"Bandwidth Enhancement of Monopole U..." refers background in this paper

  • ...It is mainly due to the fact that the resonant frequency [12] is about 5....

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Journal ArticleDOI
TL;DR: In this article, a small-size printed planar inverted-F antenna (PIFA) operated at its one-eighth wavelength (lambda/8) mode as the fundamental resonant mode for achieving WWAN (wireless wide area network) operation in the mobile phone is presented.
Abstract: A small-size printed planar inverted-F antenna (PIFA) operated at its one-eighth wavelength (lambda/8) mode as the fundamental resonant mode for achieving WWAN (wireless wide area network) operation in the mobile phone is presented. The proposed PIFA has a simple structure of comprising two radiating strips of length about lambda/8 at 900 MHz and is fed using a coupling feed. Compared to the traditional PIFA using a direct feed, the coupling feed greatly decreases the very large input impedance seen at the lambda/8 mode for the traditional PIFA and results in successful excitation of the lambda/8 mode for the proposed PIFA. Two lambda/8 modes are generated by the two radiating strips and occur at close frequencies at about 900 MHz to form a wide lower band to cover GSM850/900 operation. The two radiating strips also generate two higher-order modes or lambda/4 modes at about 1900 MHz to form a wide upper band for GSM1800/1900/UMTS operation. Penta-band WWAN operation is hence achieved, yet the proposed PIFA only occupies a small printed area of 15times31 mm2 or 465 mm2 on the system circuit board of the mobile phone, which is about the smallest for the internal uniplanar printed antenna capable of penta-band operation that have been reported. Details of the proposed PIFA are presented. The specific absorption rate (SAR) and hearing aid compatibility (HAC) results for the proposed PIFA are also analyzed.

173 citations


"Bandwidth Enhancement of Monopole U..." refers methods in this paper

  • ...One of the most popular methods is to employ a shorted strip placed above the ground plane to form the planar inverted-F antenna (PIFA) [1], [2]....

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