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B. D. Bala

Bio: B. D. Bala is an academic researcher from Universiti Teknologi Malaysia. The author has contributed to research in topics: Metamaterial antenna & Antenna (radio). The author has an hindex of 6, co-authored 22 publications receiving 100 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a small electrical metamaterial (MTM) antenna, based on a modified electrical coupled resonator for bandwidth enhancement, is presented, and the bandwidth enhancement is achieved using a modified electric coupled (MELC) resonator as the antenna's main radiating element.
Abstract: A small electrical metamaterial (MTM) antenna, based on a modified electrical coupled resonator for bandwidth enhancement, is presented. The bandwidth enhancement is achieved using a modified electric coupled (MELC) resonator as the antenna's main radiating element. This modification is achieved using two strip lines placed below a conventional electric coupled (CELC) resonator. The measured impedance bandwidth at -10 dB is 20.7% at a resonance frequency of 2.62 GHz. The design is validated by experimental results, and the proposed antenna is suitable for worldwide interoperability for microwave access (WiMax) applications (2.5-2.69 GHz).

29 citations

Journal ArticleDOI
TL;DR: In this paper, a composite right/left-handed transmission line metamaterial antenna with enhanced bandwidth and efficiency is proposed, which combines zeroth-order resonant (ZOR) and positive-order resonance (POR) modes for the bandwidth enhancement.
Abstract: A composite right-/left-handed transmission line metamaterial antenna with enhanced bandwidth and efficiency is proposed. The antenna combines zeroth-order resonant (ZOR) and positive-order resonant (POR) modes for the bandwidth enhancement. An asymmetrical coplanar waveguide technique is used to feed the antenna and also to achieve certain degree of compactness. The overall size of the antenna is 0.32λ0 × 0.38λ0 × 0.012λ0 (40 × 48 × 1.52 mm) at 2.4 GHz. Simulation results show that a bandwidth enhancement of 41% is obtained with the radiation efficiencies of 95 and 97% for the ZOR and POR modes, respectively. The measured impedance bandwidth shows that the antenna has potential applications for WLAN (2.39–2.45 GHz) and WiMAX (2.5–2.69 GHz) operations. The simulated and measured antenna performances in terms of return loss and the radiation patterns are presented and compared. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:252–256, 2015

14 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a new design method for single-feed circular polarization microstrip antenna withan arbitrary impedance matching condition, IEEE Trans AntennaPropag 59 (2011), 379-389.
Abstract: REFERENCES1. Comite Europeen de Normalisation (CEN), European Standard EN12253, July 2004.2. O. Leonardi, M. Pavone, T. Cadili, G. Sorbello, and T. Isernia, Mon-olithic patch antenna for dedicated short-range communications,Electron Lett 49 (2013), 85–86.3. B.R. Franciscatto, T.P. Vuong, T.T. Trang, and C. Defay, Micro-strip-fed quasi-Yagi antenna array for a different DSRC system, In:International Symposium on Antenna Technology and Applied Elec-tromagnetics, 2012, pp. 1–5.4. T. Varum, J. Matos, P. Pinho, R. Oliveira, and J. Lopes, Microstripantenna array for multiband dedicated short range communicationsystems, Microwave Opt Technol Lett 53 (2011), 2794–2796.5. D. Megnet and H. Mathis, Circular polarized patch antenna for 5.8GHz dedicated short-range communication, In: European MicrowaveConference (EuMC), Rome, Italy, 2009, pp. 638–641.6. M.T. Le, Q.C. Nguyen, T.P. Vuong, and C. Defay, Design of a highgain antenna at 5.8 GHz using a new metamaterials structure, In:Fourth International Conference Communications and Electronics(ICCE), IEEE, 2012, pp. 411–416.7. S. Maddio, A. Cidronali, S. Maurri, and G. Manes, Compact ETSIcompliant DSRC transponder for vehicular communications at 5.8GHz, In: 19th International Conference on Microwave Radar andWireless Communications (MIKON), Vol. 1, 2012, pp. 350–353.8. S. Maddio, A. Cidronali, I. Magrini, and G.Manes, A new designmethod for single-feed circular polarization microstrip antenna withan arbitrary impedance matching condition, IEEE Trans AntennaPropag 59 (2011), 379–389.9. C.A. Balanis, Antenna theory, Wiley, New York, 1997.10. Ansys Electromagnetic, Available at: http://www.ansys.com/.

10 citations

Proceedings ArticleDOI
01 Dec 2012
TL;DR: In this paper, a metamaterial antenna based on Split Ring Resonator (SRR) and a Thin Wire (TW) is proposed and studied, which consists of six unit cells and a thin wire of Left Handed Materials (LHM) arranged in 2×3 printed on same side of substrate.
Abstract: In this paper, a metamaterial antenna based on Split Ring Resonator (SRR) and a Thin Wire (TW) is proposed and studied The proposed antenna consists of six unit cells and a thin wire of Left Handed Materials (LHM) arranged in 2×3 printed on same side of substrate The TW stub of the unit cell is used to connect the LHM's to the radiating edge of a microstrip patch antenna The constitutive parameter of the LHM is retrieve to reveal the left handed region By using these techniques, the bandwidth of the metamaterial antenna is twice that of the ordinary patch antenna at the same operating frequency

9 citations

Journal ArticleDOI
TL;DR: In this paper, a metamaterial antenna based on complementary electric-LC (CELC) resonator is proposed, which consists of slot-loaded ELC on the ground plane as the main antennas radiating element and excited by a microstrip line.
Abstract: In this paper, a metamaterial antenna based on complementary electric-LC (CELC) resonator is proposed. The antenna consists of slot-loaded ELC on the ground plane as the main antennas radiating element and excited by a microstrip line. The CELC resonator is characterized by single-negative magnetic moment excited by coupling between the microstrip transmission line and slot-loaded CELC. The peak realized gain and efficiency of 2.63 dB and 86 % are obtained, respectively, at resonance frequency. Simulation and measurement results are presented to validate the design. The antenna is suitable for WLAN applications (2.39–2.48 GHz).

8 citations


Cited by
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[...]

08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

Journal ArticleDOI
TL;DR: In this article, a compact antenna based on fractal and metamaterial loads techniques was proposed for wireless applications and the proposed antenna is suitable for reconfigurable antenna is shown in this paper.
Abstract: ‬ We have described a compact antenna based on fractal and metamaterial loads techniques. The microstrip patch antenna is assumed as a basic antenna and then the effect of fractal structures is implemented. The fractal patch is considered as a right-handed element and then by adding a left-handed element, the antenna miniaturization is achieved by using the metamaterial loads technique. The equivalent circuit is also used to describe the element effect on miniaturization and parametric models clarify them. The proposed antenna is modified for wireless applications and experimental results confirm our simulation results. In addition, we show that the proposed antenna is suitable for reconfigurable. By joining the unit cells together with various arrangements and changing the effective length, the various inductances can be obtained. Finally, by adding reconfigurable characteristic to the proposed antenna, the gain and radiation pattern can be controlled as shows in this paper. The patch antenna has low bandwidth and gain and so we have developed the patch antenna with defected ground to improve the bandwidth and the Frequency Selective Surface (FSS) is used to achieve higher gain and bandwidth. The final antenna is covering 2.4, 3.5 and 5.5 GHz with higher gain than the patch antenna.

56 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive investigation of research carried out on dielectric resonator antennas (DRAs) in the last three and half decades, in an application-oriented approach, is presented.
Abstract: This survey article outlines a comprehensive investigation of research carried out on dielectric resonator antennas (DRAs) in the last three and half decades, in an application-oriented approach. DRAs have created a remarkable position in antenna engineering for their adept characteristics like high efficiency, low loss, wide bandwidth, compact size, 3-dimensional modeling flexibility, etc. The use of DRAs for different commercial and defense applications associated with the wireless communication is highlighted in this article. To make a smooth and effective survey article, all the application-oriented DRAs available in the open literature are classified in five different categories like microwave bands, specific frequency, technology, millimeter-wave, and miscellaneous types. The ultimate aims of this review article are as follows: (i) highlights the usability of DRAs for different commercial and defense applications, (ii) helpful for the antenna industries/manufacturers to find out the best DRA for any specific application as per their requirement, and (iii) points out research gap in some application domains which will be quite helpful for future antenna researchers. In the authors' opinion, this survey may be helpful to DRA researchers as such a survey process is not available in the open literature.

52 citations