Matching impedance with coax
Hi all, I'm trying to get an understanding of the MFJ-1800 wifi antenna. The antenna has a folded loop as the active element. Is this considered to have a 300 ohm output impedance? The folded loop is connected to 2.11 inches of 50 ohm coax that goes to an N connector. The coax has 4 torroids on it. It looks like a polyethylene core material. So I used .66 as a VF. With that I get a .66 wavelength of at 2.437 Ghz for the 2.11" coax. (yes same .66, that's just the way it worked out) So I think I'm matching 300 ohms to 50 ohms, but I don't see how .66 wavelength of 50 ohm coax does that. Fill in the details please. Here's a picture of the MFJ.
Posted 5 years ago by amdx in Wireless Networking
