Making 180 degrees phase shifter

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bejing

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Hello.
Can we make 180 degrees phase shift by using two branchline coupler?
For example connect one of them on the output coupled port of another one?
Thanks.

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When a quadrature hybrid makes a 90 degrees of constant phase shift between two output ports, can we conclude that using two of them exactly can make a 90+90 degrees phase shift?
 

many thanks dear Warpspeed.

i want to know that the above theory that i was mentioned, is true or no.
hence if one coupler make 90, two of them can make 180.
because i see in my simulations that necessarily this proposition is not true, but i am confused why.
 


A simple phase shifter with low insertion loss can be made using a Pi LC network (phase lag) or a Tee LC network (phase lead). The cut-off frequencies of the LP and HP filter networks must be outside of the phase shift band.

 

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