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and Reel for Pick and

Place Manufacturing.

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Europe

:

(315) 432-8909

(800) 411-6596

+44 2392-232392

Model XC2650P-03S

Rev A

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.

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

Avg. Ins. Loss of Test Board @ 25

°C

400 – 500 MHz

~0.03dB

800 – 1000 MHz

~ 0.06dB

1700 – 2300 MHz

~0.15dB

2300 – 2700 MHz

~0.16dB

3300 – 3800 MHz

~0.19dB

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.