microstrip directional coupler

EDAboard.com Forum Index -> RF, Microwave, Antennas and Optics -> microstrip directional coupler

Author

Message

elektr0

Joined: 02 May 2006
Posts: 174

12 Jan 2008 1:04 microstrip directional coupler

Hello,

when analyzing coupler circuits, like the rat-race-coupler, the isolated port is isolated due to destructive interference of two waves.

Is there a simple argument for the isolated port of a microstrip directional coupler, consisting of two coupled strips.

---------------------------(isolated) strip2
-------------------------------------- strip1

thanks

Last edited by elektr0 on 12 Jan 2008 11:11; edited 1 time in total

Google
AdSense
Google Adsense

12 Jan 2008 1:04 Ads

elektr0

Joined: 02 May 2006
Posts: 174

12 Jan 2008 11:10 Re: microstrip directional coupler

May be it is only possible to explain it by using L-C-matrices.
Then the coupling coefficent k is given by Lself + Lmutual and Cself + Cmutual....

simple arguments ???