Measuring the S21 of a Mini Circuits ZFSC-2-1 Power Splitter / Combiner in 3 different ways

Here, we measure the Mag[S21] of an old 5 to 500MHz power splitter / combiner, the MCL ZFSC-2-1  power splitter / combiner in 3 different ways to see how the results tally. The measurements are:

Transmission: Mag[S21] from port S to port 1, and

Isolation: Mag[S21] from port  1 to port 2

A04_6971

There is a picture of the UUT. The ports are clearly labelled. Here is a copy of the datasheet.

I used 3 different instruments to make the abovementioned measurements:

  • Agilent E5061B Network Analyzer
  • Agilent E4411B Spectrum analyzer with tracking generator
  • Anritsu S331E Sitemaster.

Agilent E5061B results:

ZFSC21_S_to_1

Transmission: Mag[S21] and Mag[S12] from port S to port 1

ZFSC21_S_to_2

Transmission: Mag[S21] and Mag[S12] from port S to port 2

ZFSC21_Isolation_1_to_2

Isolation: Mag[S21] and Mag[S12] from port 1 to port 2

Agilent E4411B results:

A04_6969

Picture of the test setup. Unlike the measurements made on the Network Analyzer, in order to obtain Mag[S12], I would have to disconnect and reconnect the cables and the termination, which I did not carry out due to laziness.

ZFSC21_S_to_2

Transmission: Mag[S21] from port S to port 1

ZFSC21_Isolation_1_to_2

Isolation: Mag[S21] from port 1 to port 2

Anritsu S331E results:

A04_6981

Picture of the test setup. As for the case of the previous setup (Spectrum Analyzer and Tracking Generator), I did not make the Mag[S12] measurements. I assume that there would not be much difference between the S21 and the S12 readings, which is indeed the case, as can be seen in the Network Analyzer results.

ZFSC-2-1_Port_S_to_1

Transmission: Mag[S21] from port S to port 1

ZFSC-2-1_Port_1_to_2

Isolation: Mag[S21] from port 1 to port 2

Conclusion:

The results from the 3 methods are similar in value.

Thanks for reading!

Jeff 9V1AS

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s