hybrid coupler ferrite

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

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

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.

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

You could try the following US patent : 3514722

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

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

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

thanks very much!

I recently found this reference:

"Lumped Element Quadrature Hybrids" by David Andrews

( I have a paper copy only)