Two methods for the measurement of antenna efficiency

Newman, E. H.; Bohley, P.; Walter, C.

doi:10.1109/tap.1975.1141114

Cited by 161 publications

(81 citation statements)

References 7 publications

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“…The values of directivity of these antennas are computed from the corresponding measured radiation patterns using the standard formulae [18] and are tabulated in Table 4. The radiating efficiency of these antennas at the corresponding resonant frequencies is determined experimentally employing Wheeler cap method [19,20]. These measured data are also tabulated in Table 4.…”

Section: Gain Directivity and Efficiencymentioning

confidence: 99%

Development of Textile Antennas for Body Wearable Applications and Investigations on Their Performance Under Bent Conditions

Sankaralingam¹,

Gupta²

2010

PIER B

156

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Abstract-Utilization of wearable textile materials for the development of microstrip antenna segment has been rapid due to the recent miniaturization of wireless devices. A wearable antenna is meant to be a part of the clothing used for communication purposes, which includes tracking and navigation, mobile computing and public safety. This paper describes design and development of four rectangular patch antennas employing different varieties of cotton and polyester clothing for on-body wireless communications in the 2.45 GHz WLAN band. The impedance and radiation characteristics are determined experimentally when the antennas are kept in flat position. The performance deterioration of a wearable antenna is analyzed under bent conditions too to check compatibility with wearable applications. Results demonstrate the suitability of these patch antennas for on-body wireless communications.

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Section: Gain Directivity and Efficiencymentioning

confidence: 99%

Development of Textile Antennas for Body Wearable Applications and Investigations on Their Performance Under Bent Conditions

Sankaralingam¹,

Gupta²

2010

PIER B

156

View full text Add to dashboard Cite

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“…As it was proven in [29], errors around plus or minus 25% can be obtained between the radiation efficiency values when the pattern integration technique is compared with the Wheeler cap method. In order to obtain similar results, identical groundplane conditions must be kept.…”

Section: E Radiation Efficiencymentioning

confidence: 86%

Resonant Meta-Surface Superstrate for Single and Multifrequency Dipole Antenna Arrays

Saenz

Gonzalo

Ederra

et al. 2008

IEEE Trans. Antennas Propagat.

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“…The radius R = λ 0 /2π is not surprising, as it is known as the radiansphere (Wheeler 1959), defined as the distance at which a transition occurs between a radiator's energy storing near field and its radiating far field. The validity of the radiansphere concept is an experimental fact and forms the basis of a wellestablished measurement of small antenna radiation efficiency (Wheeler 1959;Newman et al 1975).…”

Section: Discussionmentioning

confidence: 99%

Venturi effect on slotted metamaterial interfaces: broadband tunnelling

Monzón

2009

Proc. R. Soc. A.

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We demonstrate the existence of broadband anomalous transmission of electromagnetic (EM) waves through an electrically very narrow aperture in a thin metal plate backed by left-handed media (LHM). It is shown that the incoming energy is simply squeezed through the aperture, without any reflection, regardless of how small the physical aperture is. Analogous to the Venturi effect in fluids, the EM energy behaves as an incompressible fluid, flowing through the constriction (aperture), as if the wave character of EM was lost. This counterintuitive tunnelling effect is not related to resonances and is impossible to achieve with naturally occurring materials. Analysis indicates that a cascaded waveguide implementation, in the form of a slotted metallized LHM wall, retains the exotic broadband transparency character. Applications for a device with these properties abound in the RF/microwave/THz/optical ranges, to which the analysis can be scaled. To complement this analysis, a proposal for achieving broadband LHM is also included.

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Two methods for the measurement of antenna efficiency

Cited by 161 publications

References 7 publications

Development of Textile Antennas for Body Wearable Applications and Investigations on Their Performance Under Bent Conditions

Development of Textile Antennas for Body Wearable Applications and Investigations on Their Performance Under Bent Conditions

Resonant Meta-Surface Superstrate for Single and Multifrequency Dipole Antenna Arrays

Venturi effect on slotted metamaterial interfaces: broadband tunnelling

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