Short low- and medium-frequency antenna performance

Trainotti, V.; Dorado, Luís A.

doi:10.1109/map.2005.1599168

Cited by 21 publications

(9 citation statements)

References 8 publications

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“…Ground losses for short top-loaded aritennas have been exhaustively analyzed in [1]. It is the purpose of this section to present analytical approximations to some integrals that were solved numerically in that paper.…”

Section: Short Top-loaded Monopolesmentioning

confidence: 99%

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Simplified calculation of ground losses in low- and medium-frequency antenna systems

Dorado

Trainotti

2006

IEEE Antennas Propag. Mag.

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Calculations of ground losses are paramount in obtaining the best performance of a monopole antenna in the low-(LF) and medium-frequency (MF) bands. Ground losses are usually computed numerically, due to difficulties in the mathematical formalism. The novel approach here permits obtaining simple analytical expressions for ground-loss calculations that can be useful for determining the behavior of the ground plane. As a first approximation, the monopole antenna is placed on a perfect electrically conducting (PEC) ground plane in order to obtain the antenna current distribution and the near magnetic field, taking into account the non-zero-radius effect of the monopole. Next, the near magnetic field is used to determine the surface-current density on the ground plane below the antenna. This is divided into two zones: (1.) the artificial ground plane, where either a radial-wire ground screen or a metallic layer is used to increase the soil's conductivity; and (2.) the natural ground plane or bare soil up to a circular boundary a half wavelength from the antenna's base. The power dissipation is calculated from the artificial and natural ground-plane surface-current densities, and the ground-plane loss resistance is obtained. Also, an effective conductivity is defined as a measure of the ground plane's effectiveness, and the cases of quarter-wave monopoles and short top-loaded antennas are analyzed. Some results are validated by means of numerical computations and Moment Method simulations.

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Section: Short Top-loaded Monopolesmentioning

confidence: 99%

“…In a previous paper [1], ground losses were exhaustively analyzed for short top-loaded antennas in the low-and medium-frequency bands, using the ground-plane equivalent-loss-resistance concept [2]. Some integrals arising in the calculations were solved numerically because no closed-form expressions were known.…”

Section: Introductionmentioning

confidence: 99%

Simplified calculation of ground losses in low- and medium-frequency antenna systems

Dorado

Trainotti

2006

IEEE Antennas Propag. Mag.

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“…A classic area of interest in radio wave propagation is the monopole antenna over a lossy ground at LF, MF and HF bands [1]- [3]. For example for the miniaturization of these antennas several structures have been introduced such as top-loaded structures, optimized wire structures, etc.…”

Section: Introductionmentioning

confidence: 99%

Optimum Functions for Radial Wires of Monopole Antennas with Arbitrary Elevation Angles

Fartookzadeh¹,

Armaki

Razavi³

et al. 2016

RADIOENGINEERING

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“…The DGPS transmission frequencies are allocated in the frequency range of 283.5 kHz to 325 kHz with a frequency offset of over 1 kHz [1]. However, the antenna of the DGPS reference station is usually the top-loaded antenna type [4,5]. The ground side of the MF antenna is a series of radials.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of the Korean NDGPS Radiation Spectrum

Kim¹,

Jee²

2012

Journal of information and communication convergence engineerin

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The Korean nationwide differential global positioning system (NDGPS) reference station transmits a global positioning system (GPS) enhancement signal using minimum shift keying modulation with a 200 bps data rate. The ocean-based DGPS covers the service area of 100 NM with 300 W output power; on the other hand, the land-based DGPS transmits the output power of 500 W, which covers the service area of 100 km. The DGPS reference stations with high output power can radiate spurious signals, which may act as interference sources affecting the other DGPS reference stations or the wireless ground stations that utilize the medium frequency band. In this paper, the radiation spectrums of the DGPS reference stations are measured and analyzed in the spurious domain. The DGPS radiation spectrums are evaluated from the perspective of the interference effect.

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Short low- and medium-frequency antenna performance

Cited by 21 publications

References 8 publications

Simplified calculation of ground losses in low- and medium-frequency antenna systems

Simplified calculation of ground losses in low- and medium-frequency antenna systems

Optimum Functions for Radial Wires of Monopole Antennas with Arbitrary Elevation Angles

Measurement and Analysis of the Korean NDGPS Radiation Spectrum

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