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9khz-12.75GHz combiner?how to realize?

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amicloud

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need the full band to be passband.use as few filter as it can?
 

Does this have to be minimum loss and high isolation? Otherwise a star of 17 ohm resistors will work. Each one connected to an external port.

[edited part was typo in resistor value]
 

thanks alot.
but for a 3-way resistive diver,how to realize?
 

Connect 3 resistors (16,7 Ω) as a star and the divider is ready.
S21 Attenuation 6 dB.

Added after 10 seconds:

Connect 3 resistors (16,7 Ω) as a star and the divider is ready.
S21 Attenuation 6 dB.
 

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