Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1987-01-09
1988-08-23
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
H01Q 322, H01Q 324, H01Q 326
Patent
active
047664371
ABSTRACT:
Antenna apparatus for changing the antenna radiation pattern includes a transmitter and first and second antenna members. Each antenna member has a plurality of antenna elements which are arranged such that the elements of each antenna member are exponentially amplitude fed. A directional coupler responsive to the transmitter divides the power from the transmitter between the first and second antenna members such that each antenna member is provided with a signal of equal amplitude and phase. A variable phase shifter connected between the directional coupler and one of the antenna members is selectively operable either at 0.degree., or at a predetermined value in the range of about 60.degree. to 120.degree.. A symmetrical pencil beam pattern is provided when the variable phase shifter is set at 0.degree., and a cosecant squared pattern is provided when the variable phase shifter is set at a value in the range of about 60.degree. to 120.degree.. Switches are included to provide sum and difference monopulse and interferometry outputs.
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H. Malone, High Power Pin Diode Matrix, Motorola Inc., pp. 173-175.
Albanese Victor J.
Schmidt Charles J.
Blum Theodore M.
Geib Richard G.
Grumman Aerospace Corporation
Hoffman Bernard S.
Tick Daniel J.
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