Communications: radio wave antennas – Antennas – Slot type
Patent
1983-11-30
1986-05-27
Lieberman, Eli
Communications: radio wave antennas
Antennas
Slot type
343700MS, 343785, H01Q 1310
Patent
active
045918651
ABSTRACT:
The antenna is designed to radiate decimetric or centimetric waves according to an acute angle .theta..sub.o capable of varying by several dozens of degrees. It has the shape of a rectangular parallelepiped having a thickness e, a length L and a width l.sub.t metal-plated over almost its entire surface and containing a material having a dielectric constant .epsilon..sub.r. According to the invention only a band having a fixed width d has not been metal-plated, which band extends substantially in the center over a large face of the antenna, d being equal to several times e, the second large metal-plate face constituting the ground plane. A micro-strip line (26) which crosses the band and contains the antenna feedpoint (31) electrically interconnects the two metal-plated semi-surfaces (28, 29) defined by the non-plated band. The thickness e is of the order of that of a printed circuit board, the length L (L=N+z.sub.a) is more than twice the wavelength .lambda. of the wave to be transmitted and the width l.sub.t (l.sub.t =l.sub.1 +l.sub.2) is between 0.2 and 0.6.lambda..
REFERENCES:
patent: 2648002 (1953-08-01), Eaton
patent: 2822542 (1958-02-01), Butterfield
patent: 3739391 (1973-06-01), Mauroides et al.
Kraus Robert J.
Lieberman Eli
U.S. Philips Corporation
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