Communications: radio wave antennas – Antennas – Microstrip
Patent
1990-12-27
1993-06-01
Hille, Rolf
Communications: radio wave antennas
Antennas
Microstrip
343846, H01Q 138
Patent
active
052164306
ABSTRACT:
A printed circuit radiating element comprises a geometrically symmetric planar area of a conducting material separated from a ground plane by a dielectric medium. The driving point of the radiating element is at the base of a notch in one side thereof so that the driving impedance is reduced from that obtained when the element is driven at its edge. Symmetrically disposed on opposite sides of an axis of symmetry of the element along which the driving point lies are two notches which restore the electrical symmetry of the radiating element thereby to suppress higher order modes. The suppression of these higher order modes results in a radiation pattern with minimal cross-polarized energy in the principal planes and high port-to-port isolation which could not be achieved with an asymmetrical element. Two driving points may be employed with the radiating element to produce a dual linearly polarized antenna and a reactive combiner or hybrid may be employed to obtain circularly-polarized radiations. The shape of the radiating element may be square, rectangular or circular, for example, in accordance with the desired characteristics. A plurality of radiating elements may be interconnected via appropriate transmission paths to form an antenna array.
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"Conformal Active Aperture Array Tested," Aviation Week & Space Technology, Jul. 9, 1990, p. 48.
Frankievich Robert H.
Martinko John D.
Rahm James K.
Berard Jr. Clement A.
General Electric Company
Hille Rolf
Le Hoang-anh
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