Planar antenna in the ISM band with an omnidirectional pattern i

Details Planar antenna in the ISM band with an omnidirectional pattern i Planar antenna in the ISM band with an omnidirectional pattern i

1994-11-16

1996-12-10

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Microstrip

343797, H01Q 132

Patent

active

055835104

ABSTRACT:
A multilayer antenna includes a first layer which is a ground plane and which has a plurality of first clearance holes. A first dielectric layer is positioned over the first layer and a second layer is positioned over the first dielectric layer and has a plurality of quarter wave transformers. A second dielectric layer is positioned over the second layer and a third layer ground plane is positioned over the second dielectric layer and has a plurality of second clearance holes for a feed structure. A third dielectric layer is positioned over the third layer and a fourth layer is positioned over the third dielectric layer and has a cross shape. The first and third layers are coupled together via plated-through holes.

REFERENCES:
patent: 3747114 (1973-07-01), Shyhilla
patent: 4054874 (1977-10-01), Oltman
patent: 4218682 (1980-08-01), Yu
patent: 4329689 (1982-05-01), Yee
patent: 4431998 (1984-02-01), Finken
patent: 4710775 (1987-12-01), Cue

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