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Balanced Antenna Return Loss measurements

Question asked by jono on Feb 23, 2009
Latest reply on Feb 24, 2009 by jono
I wish to measure only the return loss of a balanced broadband dipole-type antenna in the frequency range 3GHZ to 10GHZ. I have a 2-port VNA. Is there a way of doing this without a balun, which would not be easy over the frequency range of interest anyway? The antenna is physically within a cylindrical reflector (at a 'focal-position') The reflector is metalic, and at ground potential. Could I somehow connect coax cable from the VNA ports to each antenna feed, with the coax shields connected to VNA ground (at the VNA connectors, obviously) and at the antenna metalic reflector end. If so, What setup method would I use to measure the return loss? Thank you for any advise.