Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1984-08-21
1987-03-03
Lieberman, Eli
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343846, 343894, H01G 2126
Patent
active
046479422
ABSTRACT:
A circularly polarized microwave radio antenna which is constructed so that its phase center can be very easily and very accurately positioned with respect to a marker point over which the antenna is placed is disclosed. The antenna includes a ground plane, antenna elements in a common plane parallel thereto and supported by a perpendicular center post, separate feed lines for each element and a combining network all positioned symmetrically about an axial bore in the center post so that the phase center of the antenna is on the axis of the center post at the intersection with the upper surface of the ground plane. A graduated rod may be positioned in the bore to align the antenna with the marker point. The antenna is especially useful in microwave radio interferometry systems for measuring relative position vectors between survey marks on the ground using radio frequency signals transmitted from earth orbiting satellites but may be used in any application where accurate positioning of an antenna's phase center relative to a reference point is desired or required. The antenna can be easily reproduced with substantially identical electrical and mechanical characteristics.
REFERENCES:
patent: 3922683 (1975-11-01), Kumpebeck
patent: 4042935 (1977-08-01), Ajioka et al.
patent: 4170776 (1979-10-01), Frosch
Counselman & Shapiro, "Miniature Interferometer Terminals for Earth Surveying"; Ohio State Univ., Report 280, 1978, pp. 65-85.
Counselman and Shapiro, "Miniature Interferometer Terminals for Earth Surveying"; Bulletin Geodesique, vol. 53, 1979, pp. 139-163.
Stansell, Jr.; "The MX 1502 Satellite Surveyor"; Proc. of the Second Int. Geodetic Symp. on Satellite Doppler Positioning; Jan. 22-26, 1979, Sec. 4.2, pp. 512-514.
Larsen; "Measurements to Determine the Location of the Phase Center of Geoceiver Antennas"; Proc. of Second Int. Geodetic Symp. on Satellites; Jan. 22-26, 1979, pp. 577-585.
Counselman, III Charles C.
Steinbrecher Donald H.
Brunell Norman E.
Lieberman Eli
Western Geophysical Co.
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