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XC1900A-03P Datasheet(PDF) 9 Page - Anaren Microwave |
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XC1900A-03P Datasheet(HTML) 9 Page - Anaren Microwave |
9 / 22 page Available on Tape and Reel for Pick and Place Manufacturing. USA/Canada: Toll Free: Europe : (315) 432-8909 (800) 411-6596 +44 2392-232392 Model XC2100A-20 Rev D narrowing the line before the interface pad will introduce a series inductance, which, when properly tuned, will compensate for the extra capacitive reactance. If a thicker circuit board or one with a lower dielectric constant is used, 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 3dB and 5dB couplers is different from that of the 10dB and 20dB couplers. The test board for the 3dB and 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. 10 & 20dB Test Board 3 & 5dB 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 800 – 1000 MHz ~ 0.07dB 1700 – 2300 MHz ~ 0.12dB For example, a 1900MHz, 10dB coupler on a test board may measure –10.30dB from input to the coupled port at some frequency, F1. When the loss of the test board is removed, the coupling at F1 becomes -10.18dB (-10.30dB + 0.12dB). This compensation must be made to both the coupled and direct path measurements when calculating insertion loss. 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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