George Green Institute for Electromagnetic Research

Nottingham, United Kingdom

George Green Institute for Electromagnetic Research

Nottingham, United Kingdom
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Ooi P.C.,University of Nottingham Malaysia Campus | Selvan K.T.,University of Nottingham Malaysia Campus | Selvan K.T.,George Green Institute for Electromagnetic Research
Progress In Electromagnetics Research Letters | Year: 2010

The effect of shaping the ground plane on the performance of a square loop coplanar waveguide (CPW)-fed printed antenna is reported in this paper. Experimental results are presented on the reflection coefficient and radiation pattern of the investigated antennas. Simulation results are presented on the current distribution, input impedance and gain. It is observed based on the results that shaping the ground plane significantly affects the reflection coefficients, input impedances and current distributions.


Ooi P.C.,University of Nottingham Malaysia Campus | Ooi P.C.,George Green Institute for Electromagnetic Research | Selvan K.T.,George Green Institute for Electromagnetic Research
Progress In Electromagnetics Research Letters | Year: 2010

In this paper, a circular slot antenna fed by an offset microstrip-fed line is proposed. The antenna exhibits dual-band characteristics. The two operating frequency bands are: 1.83-2.73 GHz and 5.36-7.63 GHz, which are of impedance bandwidth 39.5% and 34.9% respectively. The bands are suitable for PCS, UMTS, IMT-2000, ISM, Bluetooth, RFID and WLAN applications. A parametric study has been carried out by varying the location of the feedline to investigate its effect on the resonant frequency. Impedance, radiation and gain characteristics of the proposed antenna are also presented and discussed.


Ooi P.C.,George Green Institute for Electromagnetic Research | Selvan K.T.,George Green Institute for Electromagnetic Research
Microwave and Optical Technology Letters | Year: 2011

This paper reports a simple printed dipole antenna which exhibits dual-band operations.The antenna's radiation pattern is bidirectional in the x-y plane and close-to-omnidirectional in the x-z plane. The 10 dB impedance bandwidths achieved are 38.6% and 4.7% centered at 1.1 and 2.3 GHz, respectively. The impedance and radiation characteristics of the proposed antenna, as studied by both simulation and experiment, are satisfactory. The antenna's performance compares well with that of a recently proposed dipole antenna with fractal shape. © 2011 Wiley Periodicals, Inc.


Ooi P.C.,George Green Institute for Electromagnetic Research | Ooi P.C.,University of Nottingham Malaysia Campus | Selvan K.T.,George Green Institute for Electromagnetic Research | Selvan K.T.,University of Nottingham Malaysia Campus
Proceedings - 2010 12th International Conference on Electromagnetics in Advanced Applications, ICEAA'10 | Year: 2010

A simple square loop printed antenna fed by a coplanar waveguide (CPW) is proposed. Considering a return loss criterion of better than 9.5 dB, the antenna operates in two frequency bands: 1.73-2.50 GHz and 3.44-3.87 GHz. These bands represent 36.4% and 11.8% impedance bandwidths respectively. A parametric study has also been carried out by varying the spacing between the ground and the square loop to investigate its effect on the resonant frequency. Properties of the proposed antenna are studied through simulation and are experimentally verified. The operating frequency bands of the antenna are able to support PCS 1.85-1.99 GHz, UMTS 1.92-2.17 GHz, IMT 1.9-2.2 GHz, ISM 2.4-2.484 GHz and WiMAX 3.49-3.79 GHz bands. ©2010 IEEE.


Al-Daher Z.M.-E.,George Green Institute for Electromagnetic Research | Nothofer A.,George Green Institute for Electromagnetic Research | Christopoulos C.,George Green Institute for Electromagnetic Research | Greedy S.,George Green Institute for Electromagnetic Research
2010 Loughborough Antennas and Propagation Conference, LAPC 2010 | Year: 2010

Any electric or electronic equipment sold within the European Union has to comply with the EC Directive on Electromagnetic Compatibility (EMC). To achieve compliance, the equipment must be tested for radiated/conducted emissions and immunity. A wide range of national and international testing methods and standards are in force such as the IEC 61000-40-20 [1]. However, standards in general lack of describing testing methods for equipment with cables. Since most devices and systems contain leads and cables; the current standards cannot be directly employed. In an effort to approach this crucial matter, we present the outcomes of measurements conducted on an EUT (metal box) with different cable bundle configurations, in conjunction with both, the correlation algorithm given in the standards and the repeatability concerns between different GTEM cells. ©2010 IEEE.


Ooi P.C.,George Green Institute for Electromagnetic Research | Ooi P.C.,University of Nottingham Malaysia Campus | Theivendran S.,George Green Institute for Electromagnetic Research | Theivendran S.,University of Nottingham Malaysia Campus | And 2 more authors.
IEEE Antennas and Propagation Magazine | Year: 2012

Empirical formulas are presented for predicting the resonant frequencies of a coplanar-waveguide-fed dual-band microstrip loop antenna. The resonant frequencies predicted by the formulas compared with experiments with an average error of about 1.85%. © 2011 IEEE.

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