Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1990-08-31
1992-08-18
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343731, 343739, 343826, 343844, 342 26, H01Q 9040, H01Q 21000, H01Q 21120, G01S 13950
Patent
active
051403366
ABSTRACT:
An antenna system particularly suited for wind profiling produces a radio beam which can be oriented in each of four directions and optionally in a fifth, vertical direction and four intermediate directions. The antenna has a single array of strings of coaxial-colinear antenna elements. The strings are formed into sections, with each section having a first string portion formed of cable elements which are longer than one-half wavelength of the radio frequency drive signal in the cable and a second string portion formed of cable elements which are shorter than one-half the wavelength of the drive signal, with the two strings being connected together and mounted parallel to and above and below one another. Power is directed to the strings so that the radio frequency power flows in opposite directions in each string portion. The beam radiated from each string portion in each section adds to produce a beams tilted from the normal to the string portions by the same angle for both string portions. The direction of the beam from the strings is changed by reversing the direction of power flowing through the two string portions in each section. The direction of the beam across the array of sections is changed by changing the phase of the power provided to the several sections making up the antenna.
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Chapter 10 of the ARRL Antenna Book on Log Periodic Arrays, 1988, pp. 10-1 to 10-7.
A. Costa, Antenna Interior de Alta Ganancia para F. M. Review Esp. Electronics (Spain), vol. 23, No. 264, Nov. 1976, pp. 28-30.
Judasz et al., Improved Theoretical and Experimental Models for the Coaxial Colinear Antenna, IEEE Transactions on Antennas & Propagation, vol. 37, No. 3, Mar. 1989, pp. 289-296.
B. B. Balsley et al., "The MST Radar Technique: Potential for Middle Atmospheric Studies", Pageoph, vol. 118, 1980, Birkhauser Verlag, Basel, Switzerland, pp. 452-493.
M. A. Shapiro et al., "The Wave Propagation Laboratory Profiler System and its Applications", Cooperative Institute for Research Environmental Science, University of Colorado, and NOAA/ERL/Wave Propagation Laboratory, Boulder, Colo., 1983.
Tycho Technology, Inc., booklet entitled "Wind Profiling . . . The History, Principles, and Applications of Clear-Air Doppler Radar", 1988.
Advertising Brochure published by Unisys for Wind Profiler Systems publication date unknown.
Brochure published by Vaisala describing the Dora.TM. Wind Profilers Model 400L Lower Tropospheric Profiler, publication date unknown.
Thierry J. Judasz, "The Coaxial Colinear Antenna: Theoretical and Experimental Models", Ph.D. thesis, Electrical and Computer Engineering, University of Colorado, 1987.
Brown Peter Toby
Wimer Michael C.
Wisconsin Alumni Research Foundation
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