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ABSTRACT: A novel printed reconfigurable square slot antenna with switchable band-notched and multi-resonance performances is designed and manufactured. In the proposed structure, in order to generate single band-notched characteristics, a ∏-shaped slot is etched on the radiating stub. Furthermore, to achieve a reconfigurable function, a pin diode is utilized across the slot. When this pin diode is biased forwardly, the ∏-shaped slot transforms to a pair of C-shaped slots, and also by changing to this new structure, an additional resonance is excited. Additionally, by cutting two modified L-shaped slits with variable dimensions on the microstrip feed-line, new additional resonance is excited and hence wider impedance bandwidth can be produced, especially at the higher band. The designed antenna has a small size of 20×20 mm while showing the radiation performance in the frequency band of 3.04 to over 11.17 GHz with a switchable band rejection performance in the frequency band of 5.03 to 5.94 GHz. Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range and also it has a reconfigurable frequency band-notched function in the range of 5GHz-6GHz which can eliminate the interference between UWB frequency band and other existing wireless communication systems.
IEEE Antennas and Wireless Propagation Letters 10/2012; 11(1):1166-1169. · 1.37 Impact Factor
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ABSTRACT: A novel method for designing a new slot antenna with band-notch characteristic for
UWB applications has been presented, in this paper. The proposed antenna consists of a slotted ground plane with an extra rectangular slot on its top, in which a Ω-shaped strip is protruded, and a square-ring radiating stub in which a Ω-shaped
strip is protruded. By inserting the rectangular slot
with a Ω-shaped strip which is protruded inside this slot, in the ground plane, additional resonance is excited and hence much wider impedance bandwidth can be produced, especially at the higher band, which consequently results in a wide usable fractional bandwidth of more than 125%
(3.07-14.03 GHz). In order to generate a bandnotch
characteristic, we use a square-ring radiating
stub with a Ω-shaped strip which is protruded inside this radiating stub. The measured results reveal that the presented slot antenna offers a wide bandwidth with a band-notch operation which notches the WLAN band (5.02-5.97 GHz). The designed antenna has a small size of 20×20 mm2. Good VSWR and radiation pattern characteristics are obtained in the frequency band of interest.
Applied Computational Electromagnetics Society Journal 10/2012; 27(10-10):816-822. · 0.76 Impact Factor
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Wireless Personal Communications 04/2012; 57(2):311-311. · 0.46 Impact Factor
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Microwave and Optical Technology Letters 01/2012; · 0.62 Impact Factor
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ABSTRACT: A new compact planar monopole antenna which covers an ultra wide bandwidth of ∼147% from 2.96 to 19.43 GHz for S11 ≤ −10 dB is presented. The proposed antenna has simple configuration and easily fed by using a 50 Ω microstrip line. The total size of the antenna is 30 × 26 × 1.6 mm3. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011.
International Journal of RF and Microwave Computer-Aided Engineering 02/2011; 21(2):216 - 220. · 0.59 Impact Factor
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ABSTRACT: A novel planar inverted-F antenna (PIFA) for WLAN and WiMAX applications is presented. The proposed antenna with small size of 24 × 3 mm2, consists of rectangular radiating patch with T-shaped notch and a notched ground plane with rectangular slot which provides a usable fractional bandwidth of 4.95–5.91 GHz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:649–652, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25762
Microwave and Optical Technology Letters 01/2011; 53(3):649 - 652. · 0.62 Impact Factor
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ABSTRACT: In this article, a novel printed dipole antenna using log-periodic toothed structure is presented for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The operating frequencies of the proposed antenna are 2.4/5.2/5.8 GHz, which covers WLAN system and 2.5/3.5/5.5 GHz for WiMAX system. The desired resonant frequencies are obtained by adjusting the number of log-periodic teeth. Also by cutting two slots in the both sides of microstrip feedline on the ground plane, much wider impedance bandwidth can be produced. Prototypes of the proposed antenna have been constructed and studied experimentally. The measured results show good agreement with the numerical prediction and good multiband operation. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:536–539, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25790
Microwave and Optical Technology Letters 01/2011; 53(3):536 - 539. · 0.62 Impact Factor
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ABSTRACT: In this article, a novel printed dipole antenna is presented for satisfying wireless local area network (WLAN) applications. The operating frequencies of the proposed antenna are 2.4/5.2/5.8 GHz, which covers WLAN system. Prototypes of the proposed antenna have been constructed and studied experimentally. The measured results show good agreement with the numerical prediction. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2327–2331, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25472
Microwave and Optical Technology Letters 07/2010; 52(10):2327 - 2331. · 0.62 Impact Factor
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ABSTRACT: In this article, a novel square monopole antenna for ultra wideband applications with variable frequency band-notch characteristic is presented. By using T-shaped slots, additional resonances are excited and hence, the fractional bandwidth is increased up to 150%. A modified T-shaped conductor-backed plane is used to generate the frequency band-stop performance. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 2065–2069, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25395
Microwave and Optical Technology Letters 06/2010; 52(9):2065 - 2069. · 0.62 Impact Factor
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ABSTRACT: A small square slot antenna with circular polarisation characteristics for WLAN/WiMAX applications is presented. The proposed antenna consists of a microstrip feed line and a ground plane with a novel slot configuration which provides usable circular polarisation characteristics on the WLAN/WiMAX frequency bands. By optimising the length of the feed line, the total bandwidth of the antenna is greatly improved. Moreover, the desired circular polarisation characteristics are obtained by adjusting the number of slot arms in the ground plane. The designed antenna has a small size of 30 Ã 30 Ã mm<sup>2</sup>.
Electronics Letters 06/2010; · 0.96 Impact Factor
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ABSTRACT: In this article by using the Babinet's Equivalence Principle and self-complementary structure, we present a novel printed monopole antenna for ultra-wideband (UWB) applications. The proposed antenna consists of a ground plane and radiating patch with a slot and a sleeve structure, which provides fractional bandwidth of more than 100%. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1756–1761, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25318
Microwave and Optical Technology Letters 05/2010; 52(8):1756 - 1761. · 0.62 Impact Factor
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ABSTRACT: Circular ring microstrip antennas have several interesting properties that make it attractive in wireless applications. Although
several analysis techniques such as cavity model, generalized transmission line model, Fourier-Hankel transform domain and
the method of matched asymptotic expansion have been studied by researchers, there is no efficient design tool that has been
incorporated with a suitable optimization algorithm. In this paper, the cavity model analysis along with the genetic optimization
algorithm is presented for the design of circular ring microstrip antennas. The method studied here is based on the well-known
cavity model and the optimization of the dimensions and feed point location of the circular ring antenna is performed via
the genetic optimization algorithm, to achieve an acceptable antenna operation around a desired resonance frequency. The antennas
designed by this efficient design procedure were realized experimentally, and the results are compared. In addition, these
results are also compared to the results obtained by the commercial electromagnetic simulation tool, the FEM based software,
HFSS by ANSOFT.
International Journal of Infrared and Millimeter Waves 09/2008; 29(10):897-905. · 0.58 Impact Factor
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Antenna Technology Small Antennas and Novel Metamaterials, 2006 IEEE International Workshop on; 02/2006
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Wideband and Multi-band Antennas and Arrays, 2005. IEE (Ref. No. 2005/11059); 10/2005
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ABSTRACT: Dual-frequency patch antennas may provide an alternative to large bandwidth planar antennas, in applications in which large bandwidth is really needed for operating at to separate transmit-receive bands. When the two frequencies are far apart, a dual frequency patch structure can be conceived to avoid the use of separate antennas. In this paper the multiport analysis is coupled with an intelligent fuzzy method, to design dual-band microstrip antennas with shorting strips. An efficient CAD tool is proposed to design this type of antennas. Simulation results are compared to the results obtained by the FEM-based software, HFSS and the experimental results are also included.
Communication Networks and Services Research Conference, 2005. Proceedings of the 3rd Annual; 06/2005
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ABSTRACT: In this work we use a deterministic approach to model radio propagation channels in complex environments. The model is used to study the effect of a moving body in an indoor environment on radio propagation channels. We also evaluate the performance of diversity techniques in this environment and see that space diversity gives best improvement in reception.
Microwave Conference, 1998. 28th European; 11/1998
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ABSTRACT: We propose a deterministic approach to model the radio propagation
channels in complex environments. In this technique we divide the
environment into small and equal rectangular cells. Each box can have
its own permittivity and conductivity. The simulation is based on
geometric optics and uses ray launching and ray tracing techniques. The
information needed to reconstruct the field strength pattern inside each
cell, such as the angle, distance from source and polarization of each
ray, are calculated on the boundary of every cell. The effects of all
rectangular obstacles, such as walls, doors, columns, and so on, are
considered by the model. Both reflection and refraction effects are
taken into account. Simulation results are presented and the reliability
of these results is examined by comparing them with those obtained from
measurements at 60 GHz. We also show that it is possible to minimise the
simulation time of the model by an appropriate choice of cell size
Radio Communications at Microwave and Millimetre Wave Frequencies (Digest No. 1996/239), IEE Colloquium on; 01/1997
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ABSTRACT: Dual frequency operation of antennas has become a necessity for many applications in wireless communication systems such as GPS, GSM services operating at two different frequency bands and services of PCS and IMT-2000 applications. Although there are various techniques to achieve dual-band operation from various types of microstrip antennas, there is no efficient design tool that has been incorporated with a suitable optimization algorithm. In this paper the cavity-model based simulation tool along with an intelligent fuzzy system is presented for the design of dual-band microstrip antennas, using multiple shorting strips placed between the patch and ground plane. Since this approach is based on cavity model, the multiport approach is efficiently employed to analyze the effects of the shorting strips on the input impedance. Then the optimization of the positions of shorting strips is performed via an intelligent fuzzy system, to achieve an acceptable antenna operation over the desired frequency bands. The antennas designed by this efficient design procedure were realized experimentally, and the results are compared. In addition, these results are also compared to the results obtained by the commercial electromagnetic simulation tool, FEM-based software HFSS by ANSOFT.
