H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
H01Q 7/00 (2006.01) H01Q 1/32 (2006.01) H01Q 9/04 (2006.01) H01Q 19/02 (2006.01)
Patent
CA 2057659
ABSTRACT OF THE DISCLOSURE The disclosure relates to ring-type antennas, namely antennas comprising a ground plane, a conductive flat ring parallel to the ground plane and a dielectric layer separating the ring from the ground plane. These antennas work in a standard way in TM02 or TM11 mode. The antenna is designed to work with a configuration of the electromagnetic field between the ring and the ground plane according to the TM01 mode but with a working frequency that is reduced as compared with a standard working frequency. For this purpose, the conditions of propagation of the waves between the ring and the ground plane are modified by the introduction of a short-circuit plane between one of the rims, namely the internal or the external rim, of the ring and the ground plane. The center working frequency is thus reduced by a ratio of 3 to 4 as compared with standard working in TM02 mode. The disclosed device can be applied to antennas for radio- communications made, for example, from aircraft.
Doussot Michel
Robic
Thomson-Trt Defense
LandOfFree
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