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ST25RU3993-EVAL T2 20 dB Dir Coupler，DC1722J5020AHF frequency is 1700MHz-2300MHz，but T4 DC0710J5010AHF 10 dB Dir Coupler,frequency is 700MHz-1000MHz,Why is it designed like this?
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Hello,
please take a look at the wideband performance charts in the datasheets of the both components.
- Compare the return loss for the input and the direct port.
- Compare the insertion loss and the transmission loss.
It appears that the 1.7 GHz version has lower values and therefore a better performance.
Coupling and directivity are not so much of a concern at this point.
Cheers,
B
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