X3C25F1-02S Datasheet, PDF (9/18 Pages) Anaren Microwave – High Isolation

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Model X3C25F1-02S
Rev D
PRELIMINARY
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 board layout for the 2dB, 3dB, 4dB and 5dB couplers is different from that of the 10dB and 20dB
couplers. The test board for the 2 to 5dB couplers has all four traces interfacing with the coupler at the same angle.
The test board for the 10dB and 20dB couplers has two traces approaching at one angle and the other two traces at a
different 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.
.025 TYP
4x .040
(1.930)
2x .065
Ø.015
THRU HOLE
.140
(2.290)
2dB- 5dB Coupler 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
869-894 MHz
925-960 MHz
1805-1880 MHz
1930-1990 MHz
2110-2170 MHz
2000-2500 MHz
2500-3000 MHz
3000-3500 MHz
3500-4000 MHz
Avg. Ins. Loss of Test Board @ 25C
~0.092dB
~0.095dB
~0.166dB
~0.170dB
~0.186dB
~0.208dB
~0.240dB
~0.270dB
~0.312dB
It is important to note that the loss of the test board will change with temperature and must be considered if the
coupler is to be evaluated at other temperatures.
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