Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Designing 180 degree hybrid only with LC elements

Status
Not open for further replies.
radiohead

radiohead

Advanced Member level 1
Joined
May 13, 2004
Messages
447
Helped
66
Reputation
128
Reaction score
31
Trophy points
1,308
Location
Heart of Europe
Activity points
3,562
Hi,

Is it possible to design a 180 degree hybrid just with LC elements, so without any transformer or microstrip structure? Frequency is 30MHz, so TL's are impossible.
 

Re: 180 degree hybrid

Yes. If you are at a fixed frequency you start with an in phase power divider and add enough low pass filter operating well below cutoff to one output to get the extra phase shift.
 

180 degree hybrid

Lowpass, bandpass, highpass.delay etc. filters would do the trick.

Use Bode Plot drawing to determine Phase shift, poles, zeros and therefore L and C elements. It will be easier if this was a filter. It will become harder because it is not a filter but a filter with LC elements to behave like a 180 degrees coupler.

You have to work out some arraignment in gain of the LC filter so the filter you created works as a coupler too. After Jean Baptiste Fourier is Sir Henry Bode my most favorite guy.
 

Re: 180 degree hybrid

How about a lumped element ratrace. Which is again like a lowpass and highpass as mentioned previously.
 

    radiohead

    radiohead

    Points: 2
    Helpful Answer Positive Rating
Re: 180 degree hybrid

Frannk, this is exactly what I was looking for. A hybrid without losses from power splitters! Thanks
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top