Transmission line ( coaxial transformers)

[egemini]

coaxial transformer

Hello
Please help to understand the design of coaxial transmission line transformers used in RF power amplifier matching .
Please suggest some application notes or ebooks to refer this topic in detail.
thank you

 

[Element_115]

coax transformer

Hello Egemini

Im not sure about the Coaxial part, but Transformers are
used basically as an impedance transformer. Most output of
PA have very low impedance's. So a transformer (V/I = Z)
that's 10:1 can make 5Ohms to 50Ohms . Look at
Toko or Coilcraft website for better infomation.
Hope this helps

 

[ttosolee]

coaxial transformers

Hi, Egemini

these may help.

Motorola AN721
Impedance Matching Networks Applied to RF Power Transistors
hxxp://rfwireless.rell.com/pdfs/AN_721_D.pdf

Motorola AN1033
Match Impedances in Microwave Amplifiers
hxxp://e-www.motorola.com/files/rf_if/doc/app_note/AN1033.pdf

Motorola AN267
Matching Network Designs with Computer Solutions
hxxp://e-www.motorola.com/files/rf_if/doc/app_note/AN267.pdf

 

[flyhigh]

transmission line transformer

Hi,

Think this paper will explain something. It is about transmission line transformers in general, think you can make coaxial lines work for you based on this paper.

FlyHigh