I have a GPS chipset. I need to attach an intenna which has 50 ohm impedance. When i read the data sheet of the antenna it mentioned that the feed line to the antenna should have 50ohm impedance matching characteristics. So what kind of wire I should use to connect the chip scale GPS antenna to the pin on the GPS chipset which says GPS RF. Should I measure a wire of 50 ohm resisitance and connect it between the chip scale antenna and the pin on the GPS chipset or is it something else? Should I use any special coax cable which has 50 ohm impedance? What did it mean when it was written in the data sheet that the feed line should have a matching impedance of 50 ohm. Please let me know.
closed as too broad by Bimpelrekkie, brhans, PeterJ, Daniel Grillo, Asmyldof Sep 20 '16 at 17:43
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50ohm impedance refers to the geometry of a transmission line.
Coaxial cable is a popular type, with a thin central wire in a larger tube, spaced with plastic insulation. The geometry is maintained (as far as possible, and electrically if not mechanically) through coaxial connectors.
Microstrip is another type, with a track on one side of the board, opposite a ground plane on the other. For FR4 (a common PCB material), 50 ohm line has a width of roughly 2 substrate thicknesses.
At 1.5GHz (roughly GPS frequencies), the wavelength is 200mm (in air, less in plastic). Once your connection is less than a tenth of a wavelength long, so less than 10mm or so, you can often get away, without losing too much signal, with an unmatched connection, for instance a narrow track or piece of open wire. But it will be better if you make that track 2 substrate thicknesses wide!
I'm sorry, but you have gotten in way over your head. Since you talk about "GPS chipset", the natural assumption is that you are trying to design and fabricate a GPS unit on a pc board. Since, by your own admission, you are ignorant of RF electronics, you are likely to do it wrong.
Worse, you are apparently trying to use a very small integrated antenna without any understanding of what is entailed. I suggest you watch https://www.youtube.com/watch?v=_VC6Yyxstd4 .
In general, you will need to precisely design your pcb traces to give the desired performance. This means that you will need to know both the layer separation AND what substrate you're using. Knowing this, you can design a microstrip transmission line of the correct impedance by specifying the proper trace width.
If the above makes no sense to you (and I suspect it doesn't) you need (as has been mentioned repeatedly by others) to start learning RF design. This is not something you can just wave your hands about, and it's easy to get wrong. It is not something you can just ask "what do I do?" on an internet site.