Jan 14, 2015 #1 G gudushen Newbie level 1 Joined Jan 14, 2015 Messages 1 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 6 When I measure antenna impedance with a striped coaxial cable (taken into account port extension) I get very different readings from measuring with a normal SMA connector. Why would they be different? They are both soldered to the same pad.
When I measure antenna impedance with a striped coaxial cable (taken into account port extension) I get very different readings from measuring with a normal SMA connector. Why would they be different? They are both soldered to the same pad.
Jan 14, 2015 #2 V volker@muehlhaus Advanced Member level 6 Joined Apr 11, 2014 Messages 3,193 Helped 1,071 Reputation 2,146 Reaction score 1,142 Trophy points 1,393 Activity points 20,282 Port extension does not remove cable attenuation, so the matching with cable will be better (better by 2* cable loss). Depending on how long/short you have connected the cable leads, you have inserted extra series inductance.
Port extension does not remove cable attenuation, so the matching with cable will be better (better by 2* cable loss). Depending on how long/short you have connected the cable leads, you have inserted extra series inductance.