What question did this study set out to answer?

To establish the radiansphere as the fundamental boundary between the near and far electromagnetic fields of an electrically small antenna.

August 1, 1959Proceedings of the IRE

The Radiansphere around a Small Antenna

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Authors

HWH.A. WheelerTechnology Service Corporation (United States)

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Overview

Theoretical analysis reveals near- and far-field boundaries in small antennas, suggesting practical limits on radiation power factor and resistance measurement.

Key Points

To establish the radiansphere as the fundamental boundary between the near and far electromagnetic fields of an electrically small antenna.
Derived the field boundary at a radius of one radianlength (λ/2π), where all three field terms have equal magnitude.
Modeled an ideal antenna using a small coil wound on a spherical magnetic core to determine theoretical power factor limits based on volume ratios.
Conceptualized a conducting shell shield at the radiansphere radius to isolate radiation resistance from loss resistance.
Established that theoretical power intercepted by an isotropic antenna corresponds directly to the energy flowing through the radiansphere cross section.
Showed that an ideal small antenna achieves a radiation power factor equal to the ratio of its physical volume to the radiansphere volume.
Demonstrated that far mutual impedance behaves as mutual inductance and that a radiansphere-sized conducting shield permits independent measurement of radiation and loss resistance.

Cite This Study

H.A. Wheeler (1959) studied this question.

synapsesocial.com/papers/6a707a522fdcb5703edb6023 https://doi.org/10.1109/jrproc.1959.287198

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August 1, 1959Proceedings of the IRE

The Radiansphere around a Small Antenna

View Full Paper

Ask AI

Bookmark

Authors

HWH.A. WheelerTechnology Service Corporation (United States)

Discussion

Member takes

Overview

Theoretical analysis reveals near- and far-field boundaries in small antennas, suggesting practical limits on radiation power factor and resistance measurement.

Key Points

To establish the radiansphere as the fundamental boundary between the near and far electromagnetic fields of an electrically small antenna.
Derived the field boundary at a radius of one radianlength (λ/2π), where all three field terms have equal magnitude.
Modeled an ideal antenna using a small coil wound on a spherical magnetic core to determine theoretical power factor limits based on volume ratios.
Conceptualized a conducting shell shield at the radiansphere radius to isolate radiation resistance from loss resistance.
Established that theoretical power intercepted by an isotropic antenna corresponds directly to the energy flowing through the radiansphere cross section.
Showed that an ideal small antenna achieves a radiation power factor equal to the ratio of its physical volume to the radiansphere volume.
Demonstrated that far mutual impedance behaves as mutual inductance and that a radiansphere-sized conducting shield permits independent measurement of radiation and loss resistance.

Cite This Study

H.A. Wheeler (1959) studied this question.

synapsesocial.com/papers/6a707a522fdcb5703edb6023 https://doi.org/10.1109/jrproc.1959.287198

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