Trimble Navigation Limited

Paul K Tom

Arthur N Woo

Valentine L Denninger

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.

Dual-frequency microwave radio antenna system

A method for making printed circuit boards comprises using double treated copper foils for all inside conductor layers of multilayer packages with substrates of alloys of epoxy and polyphenylene oxide (PPO) resin to counteract the skin-effect encountered at high frequencies. Direct bonds between inside surfaces are then used without using an oxide step that introduces red/brown or black oxides.

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Saratoga, CA, United States of America

Paul K Tom