A modified elevation angle of radiation from a monopole on ground screens

Yu, Jiunn; Scott, Kurt P.; Spatuzzi, A.

doi:10.1109/tap.1970.1139785

IEEE Trans. Antennas Propagat.

1970

DOI: 10.1109/tap.1970.1139785

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A modified elevation angle of radiation from a monopole on ground screens

Jiunn Yu

Kurt P. Scott²,

A. Spatuzzi³

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1977

1981

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Cited by 2 publications

References 14 publications

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Influence of the Earth in the HF transmission of LPD antennas

DeVito¹

1977

IEEE Trans. Antennas Propagat.

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Log-periodic dipole (LPD) arrays have important applications in HF transmission for their large bandwidths and rather high gain. The nonideal terrain around the antenna gives a strong degradation of the radiation pattern at low elevation angles where the antenna is used in HF in order to utilize the ionospheric refraction. The problem is discussed, and the possible means for improving such situations are compared (eg., the raking of the antenna, the use of metallic ground Manuscript screen of different characteristics around the antenna, and the use of horizontal dipole arrays), giving consideration also to the cost.

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Influence of the Earth in the HF transmission of LPD antennas

DeVito¹

1977

IEEE Trans. Antennas Propagat.

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Synthetic imaging from coherent backscattering

Williams

1981

IEEE Trans. Antennas Propagat.

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Abstractrcattered fields from radar targets can be processed to construct target images.An analytical simulation of coherent backscattering and synthetic imaging is reviewed. Conducting objects with an axial symmetry are used as examples to demonstrate the results of analytical backscattering and synthesis procedure. An interrogating radar waveform is simulated using the Hamming weighting function. The pulse repetition frequency is selected so as to avoid slant-range image ambiguity. Backscatterings from axially symmetric targets are formulated by using the diffraction coefficients in the plane containing symmetry axis. Target-backscattered pulses are coherently processed along the aspect angles of interrogation. Coherent data are then synthesized using the Woodward method to construct target images. Four examples of synthesized images demonstrate that adequate shape and size estimates can be made even with partial backscatterings. The totally analytical simulations on scattering and imaging constitute an economical tool to visualize scattering mechanisms of complex targets and to more effectively utilize synthetic-imaging capability.

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A modified elevation angle of radiation from a monopole on ground screens

Cited by 2 publications

References 14 publications

Influence of the Earth in the HF transmission of LPD antennas

Influence of the Earth in the HF transmission of LPD antennas

Synthetic imaging from coherent backscattering

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