volume | PIER Journals

2007-11-28

Two New Loaded Compact Palnar Ultra-Wideband Antennas Using Defected Ground Structures

S. Hosseini,

Dr. S. Hosseini

Department of Electrical Engineering

Tarbiat Modares University (TMU)

Iran

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Zahra Atlasbaf,

Dr. Zahra Atlasbaf

Department of Electrical Engineering

Tarbiat Modares University (TMU)

Iran

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Keyvan Forooraghi

Professor Keyvan Forooraghi

Department of Electrical Engineering

Tarbiat Modares University

Iran

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Progress In Electromagnetics Research B, Vol. 2, 165-176, 2008

doi:10.2528/PIERB07111802

Abstract

In this paper, two new line-fed loaded planar antennas are proposed for ultra-wideband applications. The first antenna is a circular patch with a circular ring as a Defected Ground Structure (DGS). A 50 Ohm microstrip line passes through the antenna which is symmetrical between the feed and the load. The impedance bandwidth of the first antenna with S11 < -10 dB is more than 10 GHz, from 3 GHz to more than 13 GHz, in both simulation and measurement. It will be shown that the antenna has quite a stable radiation pattern and also high gain over its bandwidth. The second configuration is a rhomboidal patch which a 50 Ohm microstrip line passes through it. A rhomboidal DGS ring is employed to widen the bandwidth of the proposed antenna. The impedance bandwidth with VSWR < 2 is more than 10 GHz, from 3 GHz to more than 13 GHz, in both simulations and measurement. The second antenna has also quite a stable radiation pattern and high gain values in its frequency band. For these antennas, a wideband 50 Ohm load has been used. Finally, it should be mentioned that the antennas have very compact structures as well as very simple configurations.

Citation

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S. Hosseini, Zahra Atlasbaf, and Keyvan Forooraghi, "Two New Loaded Compact Palnar Ultra-Wideband Antennas Using Defected Ground Structures," Progress In Electromagnetics Research B, Vol. 2, 165-176, 2008.
doi:10.2528/PIERB07111802

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