Communications: radio wave antennas – Antennas – Microstrip
Patent
1995-03-10
1997-04-29
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
Microstrip
343701, 343872, H01Q 138, H01Q 142
Patent
active
056253656
ABSTRACT:
An antenna system for a navigation satellite receiver tuned to dual-frequency transmissions from orbiting navigation satellites. Respective L1 and L2 microwave patch antennas are mounted flat and adjacent to one another on a common ceramic substrate and have their centers grounded to a groundplane on the opposite side of the substrate with vias. Each patch antenna is connected to a respective near-by low-noise amplifier. The low-noise amplifiers are both connected to a signal combiner and a final radio frequency amplifier for down feed to a navigation satellite receiver. A direct current signal from the navigation satellite receiver is used on the down-feed to selectively control which one of the two low-noise amplifiers is to operate. Thus one coaxial down-feed supplies power to the low-noise amplifiers and provides for the selection between the L1 and L2 carrier frequencies on the down-feed.
REFERENCES:
patent: 4914448 (1990-04-01), Otsuka et al.
patent: 5243358 (1993-09-01), Sanford et al.
patent: 5406294 (1995-04-01), Silvey et al.
Denninger Valentine L.
Tom Paul K. W.
Le Hoanganh T.
Schatzel Thomas E.
Trimble Navigation Limited
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