# Quality of RF Power Splitter

I'm working with a transmitting radio connected to two antennas. I understand that the power split between the two should result in a loss of 3dB, but a VNA shows a loss of 5.6dB. Does this mean an additional 2.6dB is lost to heat within the power splitter?

What kinds of modifications can I make on an off-the-shelf power splitter to solve this issue?

• Do you have a datasheet for your splitter? May 6 '18 at 22:28
• In one of the comments you mention that you only did two-port measurements. Was the other port terminated properly? May 7 '18 at 7:21

Does this mean an additional 2.6dB is lost to heat within the power splitter?

Or there is a reflection back toward the generator.

Or there is some radiation from the splitter (this is unlikely to account for all of the excess loss you measured if you paid more than \$1 for the splitter).

Did you measure $S_{11}$ when you had the thing on the VNA?

When you measured $S_{21}$, did you terminate port 3 properly?

What kinds of modifications can I make on an off-the-shelf power splitter to solve this issue?