how to design RF 3dB 90 degree coupler using ferrite core?

[Needbias]

hybrid coupler ferrite

who can tell me?thanks very much!

 

[byteptr]

designing rf couplers

Try to increase µ in a parallel plate transmission line. linelength is reduced by a factor of √µ

 

[Needbias]

quadrature coupler ferrite

but what is the structure? any detail information?thanks!

 

[byteptr]

90 degree hybrid ferrite

I made a parallel-plate 90° - 3dB Hybrid coupler in PCB. May be You can make the same but with these lines in turns into a ferrite core and the lines separated with a flexible dielectric.

 

[Needbias]

rf 3db hybrid designs

I need to construct a 100~200Mhz 3dB 90° Hybrid using a ferrite core transformer,can u tell the detail?THANKS!

 

[martinthorn]

90degree coupler

You could try the following US patent : 3514722

US Patent search : https://patft.uspto.gov/netahtml/PTO/srchnum.htm

US Patent to PDF : https://www.pat2pdf.org/

Describes a transformer based wideband quadrature coupler. Note I haven't tried building this circuit myself.. Good Luck !

 

[Needbias]

rf 3db

thanks very much!

 

[Azulykit]

hybrid coupler with ferrite core

I recently found this reference:

"Lumped Element Quadrature Hybrids" by David Andrews

( I have a paper copy only)