Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1997-03-13
1999-08-24
Wong, Don
Communications: radio wave antennas
Antennas
With radio cabinet
343700MS, H01Q 124
Patent
active
059430206
ABSTRACT:
A flat three-dimensional antenna is built in three planes. In the first plane is a base plate, in the second plane is a slot divider bent in a U-shape, and in the third plane is resonant structure above the slot divider. The slot divider has a middle part with a length of preferably .lambda./4 and two limbs of .lambda./8 of the same length. With the base plate the slot divider forms a .lambda./2 antenna slot, while the resonant structure with the slot divider defines a shorter second antenna slot. The antenna is characterized by a large bandwidth and omnidirectional radiation characteristic. Perpendicular to the base plate there is essentially no radiation. Feeding takes place preferably via a stripline which is routed between two limbs to a middle part. Impedance matching of the antenna is achieved by suitable dimensioning of the stripline. The antenna can be built equally well in air as well as in a dielectric such as a ceramic block. Several of these antennas can be combined into an ultracompact diversity antenna system.
REFERENCES:
patent: 4197544 (1980-04-01), Kaloi
patent: 5309164 (1994-05-01), Dienes et al.
patent: 5510802 (1996-04-01), Tsuru et al.
patent: 5541610 (1996-07-01), Imanishi et al.
patent: 5657028 (1997-08-01), Sanad
patent: 5838280 (1998-11-01), Miyashita
Dersch Ulrich
Liebendoerfer Matthias
ASCOM Tech AG
Malos Jennifer H.
Wong Don
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