how to create 90 degree phase different

[shadow_khan]

Hi all,

I'm still learning in designing patch antenna...
I want to ask how to make a 90 degree phase different current?
for example bending the the microstrip line.
is there any other method to do that?
and will it also change the magnitude?
actually I want to keep the magnitude remain unchanged.

Thanks before...

 

[dinesh agarwal]

rc cr circuits mentioned in RF microelectronic by RAzavy

 

[mfarhan1]

use parallel line coupler it will give you 90 phase difference, you can use hybrid also.

 

[johnson.mike]

hybrid can be used.
Phase can also be varied by altering the cable length r strip length.

 

[alexandr22061986]

Use single λ/4 microstrip line, it will give 90° phase shift.

 

[eastern]

if you want to create cicular pol. with a patch antenna see https://en.wikipedia.org/wiki/Patch_antenna
there you will see a circular patch with two slots on it. this will change the current distribution on the patch and gives you circular pol.

 

[vfone]

**broken link removed**

 

[dinesh agarwal]

poly phase filter can you use these passive devices

 

[peter7488]

you can use LC to do that