Radiation from a Circular Loop Antenna Placed Coaxially Relative to a Conducting Body of Revolution

Hamed, Sameir M. Ali; Abbas, Mohammed Ali Hamad

doi:10.1109/tap.2012.2207338

Cited by 13 publications

(20 citation statements)

References 9 publications

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“…al. [11,12] have shown that the presence of a conducting body of revolution type reflectors near a loop antenna can improve both antenna directivity and VSWR. Even though extensive research is conducted on loop antenna arrays and systems as Yagi-Uda and log periodic arrays, seldom published work on concentric loop array configuration can be found.…”

Section: Introductionmentioning

confidence: 99%

Design Formulas for Broadband Concentric Circular-Loops Antennas

Hamed¹,

Osman²

2015

AEM

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This paper presents a simple formulas for designing broadband concentric circular-loops antennas (CCLAs). The loop dimensions for widest bandwidth are derived and expressed in terms of driven loop resonance frequency. The analysis addresses CCLAs with and without ground planes senarios.The derived formulas are used to design multiple CCLAs. For example, a 3-elements CCLA of a maximum radius of 6.34 cm can be designed to operate with a voltage standing wave ratio (VSWR) < 2 over the frequency band with fractional bandwidth of 16.9% with a minimum directivity of 3.9 dB. Addionationally, a 4-elements CCLA of maximum radius of 15 cm can be design to operate in the frequency band extending from 825 MHz to 991 MHz (fractional bandwidth of 18.3%) with a VSWR < 2 and directivity higher than 5.2 dB over the entire band. Furthermore, the analysis shows that a 3-elements CCLA backed with a conducting ground plane improves the fractional bandwidth to 19.6% and directivity to 9.15 dB over the band of interest. The analytical results on designed antennas are validated with simulation results obtained by using the AN-SOF antenna simulation software. An excellent agreement is observed between analytical and AN-SOF simulations results.

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Section: Introductionmentioning

confidence: 99%

Design Formulas for Broadband Concentric Circular-Loops Antennas

Hamed¹,

Osman²

2015

AEM

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“…The radiation characteristics of the loop antenna can be improved by adding a planar reflector to the loop with a suitable spacing [15] and [16]. On the other hand, the performance of the CLA largely improves in terms of impedance matching and gain when a body Manuscript of revolution (BOR)-type of reflector is placed in proximity to it [13] and [14].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a hybrid technique has been introduced to study the characteristics of the CLA placed coaxially relative to conducting bodies of revolution [13], [14]. This technique provides a useful tool to study the characteristics of CLAs in the presence of a wide range of BOR structures.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of a Circular Loop Antenna in the Presence of a Coaxial Conducting BOR Attached to a Planar Reflector

Hamed

Bashir

2013

Antennas Wirel. Propag. Lett.

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The performance of the circular loop antenna (CLA) largely improves in terms of impedance matching and directive gain when a body of revolution (BOR)-type of reflector is placed symmetrically relative to the loop. The input impedance, reflection coefficient, VSWR, directivity, and radiation patterns of a loop antenna for cases of a reflector-hemisphere and a reflector-cone are investigated in this letter. It is found that for a resonant loop, directivity over 9 dB and VSWR less than 2 over a bandwidth of 48.5 MHz can be obtained. The study also shows that the characteristics of the CLA depend mainly on the height of the loop over the reflector and the total surface area of the reflector-body irrespective of the body shape.Index Terms-Body of revolution, loop antenna, reflector, resonant loop.

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“…The far-fields of the problem of multi-turn half-loop [16] and arrays of CLAs are considered in [16] and [17]. The CLA over planar interfaces, finite/infinite ground planes was considered in many researches, a sample of these is documented in [18] - [21]. Although there is an extensive literature in the problem of CLA systems, no evidence that the problem of near-fields radiated from an array of CLAs had been dealt with before.…”

Section: Introductionmentioning

confidence: 99%

Near-fields of an array of circular-loop antennas

Hamed

Musa

Bashir

2013

2013 International Conference on Computing, Electrical and Electronic Engineering (Icceee)

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In this paper an exact electromagnetic near-fields expressions for an array of circular loop antennas (CLA) are presented. The technique is based on the spherical wave functions expansion for the free space Green's function. Fields of the uniform current CLAs array and that on the axis of the array, as well as the fields of the so called gate antenna arrangement, are obtained from the general expressions as a special cases. The known far-field expressions for the array of CLAs are derived from the general expressions which check the correctness of these general field expressions.

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Radiation from a Circular Loop Antenna Placed Coaxially Relative to a Conducting Body of Revolution

Cited by 13 publications

References 9 publications

Design Formulas for Broadband Concentric Circular-Loops Antennas

Design Formulas for Broadband Concentric Circular-Loops Antennas

Characteristics of a Circular Loop Antenna in the Presence of a Coaxial Conducting BOR Attached to a Planar Reflector

Near-fields of an array of circular-loop antennas

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