Subsurface antenna system
First Claim
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1. A subsurface antenna system having a radiation pattern exhibiting improved directivity in the free space above a subsurface comprising:
- first and second radiation elements identically oriented and buried within a semi-infinite dissipative medium and adapted to radiate signals at a frequency in free space adjacent said semi-infinite dissipative medium;
means coupled to said radiating elements for applying said signals with a selected relative phase therebetween;
said radiating elements comprising conductors totally covered with insulating material so that said conductors are totally insulated from the medium;
said radiating elements having their respective centers spaced apart by at least one quarter free space wavelength of said frequency; and
said spacing and relative phase being further chosen to enhance the desired directivity of said antenna in free space.
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Abstract
A subsurface antenna system including at least one pair of radiating elements and feed system is buried within a subsurface medium. The radiating elements comprising the system are spaced apart at least one quarter free space wavelength at an operating frequency. The radiating elements are spaced from each other and the feed system provides appropriate relative phase to signals at the elements to produce from the antenna system a directional antenna pattern in free space.
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Citations
27 Claims
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1. A subsurface antenna system having a radiation pattern exhibiting improved directivity in the free space above a subsurface comprising:
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first and second radiation elements identically oriented and buried within a semi-infinite dissipative medium and adapted to radiate signals at a frequency in free space adjacent said semi-infinite dissipative medium; means coupled to said radiating elements for applying said signals with a selected relative phase therebetween; said radiating elements comprising conductors totally covered with insulating material so that said conductors are totally insulated from the medium; said radiating elements having their respective centers spaced apart by at least one quarter free space wavelength of said frequency; and said spacing and relative phase being further chosen to enhance the desired directivity of said antenna in free space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A phase steered subsurface antenna system having a radiation pattern exhibiting the suppression of undesired natural existing radiation and a directed radiation, the pointing angle of which is selectable comprising:
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at least one pair of spaced apart radiating elements buried within a semi-infinite dissipative medium and adapted to radiate signals at a frequency in free space adjacent said medium, said elements being totally electrically insulated from said medium and identically oriented and spaced apart by at least a quarter free space wavelength at said frequency in a fashion which enhances radiation in a preselected direction and suppresses radiation in other directions; and means coupled to radiating elements for applying said signals thereto, wherein the relative phase of said signals to said pair of elements of variable, whereby upon varying said relative phase, said pointing angle of said directed radiation is varied. - View Dependent Claims (20, 21, 22, 23)
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24. A subsurface antenna system having a radiation pattern exhibiting an improved directivity comprising:
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a first pair of parallel, adjacently aligned and spaced apart doublets, each doublet having colinearly aligned spaced apart radiating elements; a second pair of parallel, adjacently aligned and spaced apart doulets, each doublet having colinearly aligned spaced apart radiating elements whereby said first and second pair form a first subarray wherein all radiating elements are identically oriented and buried within a semi-infinite dissipative medium; a second subarray identical to said first subarray lying in the same geometric plane therewith, and colinearly spaced apart therefrom, said first and second subarrays being totally electrically insulated from said medium and adapted to radiate or receive signals at a frequency in free space adjacent said medium, said doublets having their respective radiation centers spaced apart by at least one quarter free space wavelength of said frequency; and means coupled to said subarrays for applying signals to the elements thereof with a selected relative phase therebetewen, said spacing and said relative phase being chosen to enhance the desired directivity of said radiated signal in one direction and enhance the desired directivity of said received signal in another direction. - View Dependent Claims (25, 26, 27)
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Specification