Input impedance of a dipole antenna above a conducting half space

The current distribution, input impedance, and radiation pattern of a cylindrical dipole antenna enclosed by a thin cylindrical shell of double negative (DNG) metamaterial are computed using the piecewise sinusoidal Galerkin formulation. In the presence of the DNG shell, the dipole antenna exhibits three interesting characteristics. The input impedance shows potentials for wide bandwidth due to the relative insensitivity of the impedance with frequency. Within specific ranges of DNG material parameter values, the dipole shows resonance at much lower frequencies than its resonant frequency in free space. The dipole does not show change in the direction of the principal beam nor does it show signs of beam splitting and side lobes even when the antenna length approaches one and a half wavelength.

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Simple approximation for accurate analysis of horizontal dipole antenna above a lossy half-space

2011 10th International Conference on Telecommunication in Modern Satellite Cable and Broadcasting Services (TELSIKS) ◽

10.1109/telsks.2011.6143237 ◽

2011 ◽

Cited By ~ 2

Author(s):

Milica P. Rancic ◽

Slavoljub R. Aleksic

Keyword(s):

Half Space ◽

Dipole Antenna ◽

Simple Approximation ◽

Accurate Analysis

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The input impedance of a concentric curved dipole antenna above a spherical conducting surface

10.1109/aps.1970.1150803 ◽

2005 ◽

Author(s):

E. Dickerson

Keyword(s):

Input Impedance ◽

Dipole Antenna ◽

Conducting Surface

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Microruban Dipole Antenna for RFID Applications at 2.45 GHz

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v6i6.pp2891-2899 ◽

2016 ◽

Vol 6 (6) ◽

pp. 2891 ◽

Cited By ~ 1

Author(s):

Loubna Berrich ◽

Lahbib Zenkouar

Keyword(s):

Radio Frequency Identification ◽

Integrated Circuit ◽

Input Impedance ◽

Dipole Antenna ◽

Antenna Design ◽

Reflection Coefficients ◽

Ansoft Hfss ◽

Frequency Identification ◽

Folded Dipole ◽

Rfid Applications

<p><span lang="EN-US">Radio Frequency Identification (RFID) is a technology used mainly to identify tagged items or to track their locations. The most used antennas for RFID application are planar dipoles. For antenna design, it is necessary that the antenna has an impedance value equal to the conjugate of the impedance of the integrated circuit CI. To have a good adaptation allowing the maximum power transfer, there are several techniques. In this work we focus to the adaptation technical T-match which is based on the insertion of a second folded dipole in the center of the first dipole. This technique is modeled by an equivalent circuit to calculate the size of the folded dipole to have new input impedance of the antenna equal to the conjugate of the impedance of the IC. We also look to present a conceptual and technological approach of new topologies of linear dipoles. We proceeded to fold at right angles of the radiating strands in order to explore other topologiesof type L and Z. The interest of this microstrip folded dipole is their effectiveness to achieve coverage of Blind directions. The results obtained by the platform Ansoft HFSS, allowed us to obtain a quasi-uniform radiation patterns and the reflection coefficients that exceed -37 dB.</span></p>

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