Making 180 degrees phase shifter
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.
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?
Easiest way to get 180 degrees is with a broadband matching transformer.
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.
Then your 2 * 90° signal that goes through 2 couplers has 6dB loss, but the 0° has only 3dB loss.
You can use a rat race coupler instead, which has 180° phase shift.
https://www.microwaves101.com/encycl...-race-couplers
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.
