Monopole Antennas

Weiner, M.

doi:10.1201/9780203912676

Cited by 87 publications

(48 citation statements)

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“…Therefore, the monopole antenna on the ground plane can be modeled as a half-wave dipole using the method of images [14]. In this case, the ground plane prevents monopole radiation into the hemisphere below the ground plane, but allows a radiation pattern identical to that of a dipole in the upper hemisphere [2]. Fig.…”

Section: Analytical Deduction Of the Radiation Characteristics Ofmentioning

confidence: 99%

“…2(b). Ground losses are avoided by elevating the antenna as higher as possible at least at quarter wavelength height from the earth's surface [2]. The other possibility is to add as many radials as possible in order to minimize the current on each radial.…”

Section: Introductionmentioning

confidence: 99%

“…A typical feedline for the monopole antenna is a coaxial cable with its inner conductor connected through a hole to the ground plane to the vertical monopole element and its outer conductor connected by means of a flange to the ground plane [2]. Typically the inner conductor's diameter is equal to the monopole element's diameter and the outer conductor's diameter is equal to the ground plane hole diameter [2]. Impedance matching between the 50 Ω coaxial cable feedline and the antenna feedpoint is achieved by bending the radials 45 0 downwards with respect to the horizontal plane [3].…”

Section: Introductionmentioning

confidence: 99%

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Radiation Characteristics of a Quarter-Wave Monopole Antenna above Virtual Ground

Khan¹,

Azim²,

Islam³

2014

JOCET

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Abstract-In recent years, monopole antennas have become one of the vital components of cellular mobile communications and internet networks across the globe. Their relatively easy and low fabrication cost and faster installation makes them an obvious choice for developing countries. The most common form is the quarter-wave monopole, in which the antenna is approximately 1/4 of a wavelength of the radio waves. In this paper, we present the analytical treatment of a quarter-wave monopole antenna above virtual ground. Virtual ground is realized by using bent radials around the vertical monopole element. Radiation resistance and gain of the quarter-wave monopole are mathematically derived and three-dimensional radiation patterns are simulated using sinusoidal current distribution. It is observed that for the case of the quarter-wave monopole, we achieve twice the gain of a dipole antenna of half-wave-length long. As the radiated power is limited to upper hemisphere of the ground plane, the total radiated power of the quarter-wave monopole is half of that of a dipole. Hence, the value of radiation resistance of the monopole is half of that of a dipole.Index Terms-Ground plane, radiation pattern, directivity, half-wave dipole, monopole antenna.

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Section: Analytical Deduction Of the Radiation Characteristics Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radiation Characteristics of a Quarter-Wave Monopole Antenna above Virtual Ground

Khan¹,

Azim²,

Islam³

2014

JOCET

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“…For quarter-wave monopole antenna with disk ground plane in free space, the directivity on horizon increases approximately with decreasing disc radius [12]. Small ground size is effective in reducing the elevation angle of peak directivity [12].…”

Section: Antenna Design Concept and Structurementioning

confidence: 94%

“…Thus the proposed antenna in this paper is much smaller than the antenna in [11]. Moreover, the antenna has a relatively low elevation compared with traditional annular ring slot antennas due to its small ground size [12]. Details of the design and principle of the proposed antenna are described.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Annular Ring Slot Antenna for Small/Mini Uav Applications

Sun¹,

Sun²,

Sun³

et al. 2014

PIER C

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Abstract-A miniaturized annular ring slot antenna is presented. The antenna consists of an annular ring slot structure and a novel folded matching structure. The annular ring slot structure is printed on a substrate and shorted concentrically with a set of conductive vias. The additional matching structure is a ring cavity attached to the back of the annular ring slot structure. Firstly, the diameter of the proposed antenna is reduced by using the folded matching structure comparing with traditional annular ring slot antennas. Secondly, the impedance matching of the proposed antenna is achieved by optimizing the size of the matching structure. A prototype of the proposed antenna with a height of 3.048 mm (0.03λ) and a radius of 47.2 mm (0.4λ) is designed, fabricated and measured. The antenna resonates at 2.67 GHz and has a monopole-like radiation pattern, which shows that the antenna is suitable for the applications of taking off, landing, and long distance communications for a small or mini UAV.

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Small Antennas

2021

Antenna and EM Modeling With MATLAB® Antenna Toolbox

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Monopole Antennas

Cited by 87 publications

References 0 publications

Radiation Characteristics of a Quarter-Wave Monopole Antenna above Virtual Ground

Radiation Characteristics of a Quarter-Wave Monopole Antenna above Virtual Ground

Miniaturized Annular Ring Slot Antenna for Small/Mini Uav Applications

Small Antennas

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