Ground Influence on the Input Impedance of Transient Dipole and Bow-Tie Antennas

Lestari, A.A.; Yarovoy, Alexander; Ligthart, L.P.

doi:10.1109/tap.2004.832371

Cited by 27 publications

(23 citation statements)

References 15 publications

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“…It can be seen that the presence of the marble does not significantly influence the input-impedance values when the antenna is located at elevations higher than of the wavelength corresponding to the central frequency of the excitation signal (12 cm). This corroborates the results presented in [9] and [25], where similar behavior was reported for a PEC thin-wire bow-tie antenna. We, also, find than the coupling between the antenna and the ground increases the fidelity of the antenna response, as the lossy ground acts as an extra resistive load on the wire.…”

Section: Numerical Resultssupporting

confidence: 92%

GA design of a thin-wire bow-tie antenna for GPR applications

Coevorden

Bretones

Pantoja

et al. 2006

IEEE Trans. Geosci. Remote Sensing

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Abstract-A microgenetic algorithm has been applied to design a new ultrawideband thin-wire bow-tie antenna for ground-penetrating radar applications. The broadband performance of the antenna is achieved by resistive loading and by optimizing the number of wires and the angular distances between those wires. The radiation characteristics of the optimized antenna are discussed, and its performance is compared to that of a restively loaded Wu-King dipole.

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Section: Numerical Resultssupporting

confidence: 92%

GA design of a thin-wire bow-tie antenna for GPR applications

Coevorden

Bretones

Pantoja

et al. 2006

IEEE Trans. Geosci. Remote Sensing

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show abstract

“…The boundaries of the FDTD volume are terminated using the uniaxial perfectly matched layer (UPML) absorbing boundary conditions. The UPML is composed of a number of cells with a specific profile of the electric and magnetic properties and is backed by perfectly conducting walls [8].…”

Section: Electromagnetic Modeling Of the Gpr System Using Fdtdmentioning

confidence: 99%

“…In [2], a separated-aperture sensor which consists of two dipoles housed in corner reflectors that are separated by a metallic septum is discussed and simulated using the FDTD method. In [3,4,10,12], an efficient bowtie antenna for GPR system is developed to exhibit good efficiency in ultra-wide band using a combination of a tapered capacitive and resistive loading.…”

Section: Introductionmentioning

confidence: 99%

Wideband Partially-Covered Bowtie Antenna for Ground-Penetrating-Radars

Atteia¹,

Shaalan²,

Hussein³

2007

PIER

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Abstract-In this paper, wide band transmitting and receiving antennas; each composed of a bowtie partially covered by an open conducting box; are proposed for ground-penetrating-radar (GPR) system. The inner walls of the conducting box are covered by a lossy coating which is composed of a number of layers with a conductivity profile designed to achieve better characteristics of the bowtie antenna. The Finite-Difference Time-Domain (FDTD) method is applied to simulate the radiating and receiving antennas, the buried target and the wave propagation in the lossy ground soil over the frequency band of operation. The performance of the proposed system is examined as regards the antenna characteristics and the buried target detectability. The impedance and voltage standing wave ratio (VSWR) of the partially covered bowtie antenna are presented over a wide frequency range. The capability of the proposed GPR system to detect targets buried in a ground soil is examined by investigating the change of the coupling between the transmitting and receiving antennas due to the presence of a buried target. The effect of the ground soil on the antenna characteristics is studied for some common types of real soils when the GPR system is placed at different heights above the ground surface.

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“…In particular, the problem pertains to an antenna matching problem. We have learned that when an antenna is situated in a proximity to the ground its input impedance varies significantly with the antenna elevation and the type of the ground [1], [2]. From the system point of view, such input impedance variation is disadvantageous as it leads to difficulty in maintaining a matched condition at the antenna's terminal.…”

Section: Introductionmentioning

confidence: 99%

“…It has been demonstrated that the input impedance of typical GPR antennas (i.e., dipoles and bow ties) fluctuates more with antenna elevation for a larger dielectric permittivity of the ground [2]. Moreover, it has been found that the fluctuation is significant only for very small distances (i.e., a fraction of the wavelength corresponding to the central frequency of the exciting pulse) from the ground [2].…”

Section: Introductionmentioning

confidence: 99%

Adaptive wire bow-tie antenna for GPR applications

Lestari

Yarovoy

Ligthart

2005

IEEE Trans. Antennas Propagat.

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Abstract-In this paper, the basic design of an adaptive ground penetrating radar antenna is introduced. The antenna is able to adapt its input impedance to a variation in the antenna elevation and soil type to keep reflections at the antenna's terminal minimum. As a result, energy transfer from the generator to the antenna is maximized, which in turn maximizes the energy radiated by the antenna into the ground for different antenna elevations and soil types. The antenna is based on a wire bow-tie structure with variable flare angle for adjusting the antenna's input impedance. The flare angle variation is realized by short-circuiting the gaps separating the wires from the feed point of the antenna, for which electronic switching devices such as PIN diodes could be used to allow fast and convenient control of the antenna's flare angle.

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Ground Influence on the Input Impedance of Transient Dipole and Bow-Tie Antennas

Cited by 27 publications

References 15 publications

GA design of a thin-wire bow-tie antenna for GPR applications

GA design of a thin-wire bow-tie antenna for GPR applications

Wideband Partially-Covered Bowtie Antenna for Ground-Penetrating-Radars

Adaptive wire bow-tie antenna for GPR applications

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