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1.	A Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â coupler comprises a number of cascaded stages, each incorporating three or four-port FBT couplers to obtain a multiport output.
A.	star
B.	ladder
C.	wdm
D.	three-port
Answer» B. ladder

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