What is the hybrid 90 degree function in microstrip?

Hi

The standard hybrid have four ports:
1. input port
2. output -3dB 90 degree phase shift compared to port 1
3. output -3dB 180 degree phase shift compared to port 1
4. port isolated

They are use among other things in balanced amplifier configurations. To achieve good return loss and high stability.

Hope it helped
Regards

They are also often used to create a circular polarized antenna.

thx...
it can hence the bandwidth or just for making circular polarization....

so if hybrid 180 degree, is it only use 1 and 3? port 2 neglect it by not connect to anything?

or how to configure which is 90 degree and which is 180 degree hybrid?

Hi

The branch-line coupler (90 degree hybrid)

Need all the ports to be connected to function correctly.
If it is a 50 ohm system, then all ports must be matched to 50 ohm. Otherwise you will not have the equal power spilt to port 2 and 3 and perfect match at all ports at the same time.

A 180 degree coupler (Rat-race) is able to make a 0 and 180 degree power spilt with the signals out of phase.

Regards

can you guide me on how to connect based on the figure attached below?

hi
can you give me some example about the hybrid 90 degree. send to my email siwowox@yahoo.com
coz i have some project using hybrid. i want to make MSA triangular switch hybrid 90 degree.
ok thx b for