XC0900L-03 Datasheet, PDF (9/24 Pages) Anaren Microwave – Tight Amplitude Balance

Model XC0900L-03
Rev B
the interface pad will have less capacitive reactance than the Anaren test board. In this case, a wider section of line
before the interface pad (or a larger interface pad) will introduce a shunt capacitance and when properly tuned will
match the performance of the Anaren test board.
Notice that the test board for the 3dB couplers has all four traces interfacing with the coupler at the same angle. The
entry angle of the traces has a significant impact on the RF performance and these parts have been
optimized for the layout used on the test boards shown below.
57904-0001
w=66.0
3 dB Test Board
Testing Sample Parts Supplied on Anaren Test Boards
If you have received a coupler installed on an Anaren produced microstrip test board, please remember to remove the
loss of the test board from the measured data. The loss is small enough that it is not of concern for Return Loss and
Isolation/Directivity, but it should certainly be considered when measuring coupling and calculating the insertion loss
of the coupler. An S-parameter file for a “Thru” board (see description of “Thru” board above) will be supplied upon
request. As a first order approximation, one should consider the following loss estimates:
Frequency Band
800 – 1000 MHz
Avg. Ins. Loss of Test Board @ 25°C
~ 0.07dB
The loss estimates in the table above come from room temperature measurements. It is important to note that the
loss of the test board will change with temperature. This fact must be considered if the coupler is to be evaluated at
other temperatures.
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