Directional coupler ' problem

EDAboard.com Forum Index -> RF, Microwave, Antennas and Optics -> Directional coupler ' problem

Author

Message

CQCQ

Joined: 26 Nov 2006
Posts: 65

18 Mar 2007 4:16 Directional coupler ' problem

Hi! I have a Directional coupler with four CPL ports,I dont know what is difference between the four CPL ports,?From the "performance data" I see the coupling is 30dB,So If I connect four CPL ports can reach 120dB? or still 30dB?and I dont know what the "isolation cpl-cpl"means in the performance.
THS!

CQCQ

Google
AdSense
Google Adsense

18 Mar 2007 4:16 Ads

Sorry, but you need login in to view this attachment

VSWR

Joined: 07 Feb 2002
Posts: 767
Helped: 72

18 Mar 2007 11:04 Re: Directional coupler ' problem

I guess the four coupled ports are the same: each of them has a coupling of 30 dB, relative the input port. Then there is an internal isolation between each of the coupled ports, having the value in the column "Isolation (dB) Cpl-Cpl". You cannot get 120 dB with this device.

mathuranathan

Joined: 11 Sep 2006
Posts: 247
Helped: 29
Location: India

18 Mar 2007 11:37 Re: Directional coupler ' problem

Isolation cpl-cpl is the isolation provided between the couples ports.

The power that leaks from one coupled port to other couples port is -31 dB.

You cant get 120 dB here.