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

Mode converstaion: Connect coxial cable to differential PCB

Status
Not open for further replies.
F

flanello

Advanced Member level 1
Joined
Jan 9, 2008
Messages
433
Helped
91
Reputation
182
Reaction score
82
Trophy points
1,308
Activity points
3,491
Hello,

is there a method to estimate the mode conversation when a coaxial cable is connected to PCB with a differential circuit connected over a parallel strip line?
 

Using Balun ( it can be lumped or discrete depending on bandwidth) may be a solution.
 
Well, if you just solder a coax cable center and shield to a differential line...it will stink. If you put ferrite beads on the outside of the coax cable it will be a little better. Narrowband you can use a microstrip stub where the coax shield connects to keep currents flowing back on the outside of the coax. A balun is the correct way to do it.
 
Thanks for the information.
But there is no rule of thumb to estimate the effect?
 

If you were going from 1 to 3 GHz with such a thing, I would expect a 3 db insertion loss ripple, and maybe a return loss that went to 5 dB
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top