Hi Attila,
The "good" patch antennas thus > employ a four point feed, but this makes the whole antenna quite a > bit more expensive, as a 0°/90°/180°/270° phase spliter/hybrid is > needed. Of course, any such circuit is rather difficult to make > wide-band and thus becomes the bandwidth limiting element. > Mini-Circuits has such a 4-port phase splitter, part number SCQ-4-1650+. It's $25, which is not super cheap, but it's unclear one could implement such a network with a planar circuit for less, and the planar circuit would be more bulky. I've been thinking of picking up one of these to give an untuned 4-filar helix a try (not a fancy resonant backfire quadrifilar helix, which are hard to make broadband, but just a plain set of 4 helices and the combiner). From the data sheet it's clear they have GNSS in mind, and it is quite broadband: https://www.minicircuits.com/pdfs/SCQ-4-1650+.pdf Cheers, Peter _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
