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.

Wideband impedance matching

Status
Not open for further replies.

tlz

Newbie level 4
Joined
Feb 2, 2015
Messages
5
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
48
I'm using an antenna that works in the range from 1 GHz to 3 GHz. I want to match impedances between a cable from the transmitter and the input amplifier and from the output amplifier and the cable to the receiver to get the maximum power and the lossless.

I found that there are some techniques called Bode-Fano equations, five λ/4 impedance transformer and stub tuner when you use a wide range of frequencies (1GHz to 3GHz) instead only one frequency, but I don't understand it how could I used it. Can you help me?
 

vfone

Advanced Member level 5
Joined
Oct 10, 2001
Messages
5,350
Helped
1,553
Reputation
3,109
Reaction score
1,166
Trophy points
1,393
Activity points
33,900
I am not familiar with the method you mentioned, but the most effective broadband matching topology that I used (using lumped components) was a cascaded L, High-Pass-T, L, network.
The frequency range was between 900MHz and 2.5GHz, but might work up to 3GHz with careful consideration of the parasitics of the components and layout.
The component values must be optimized by a simulator.

 

tlz

Newbie level 4
Joined
Feb 2, 2015
Messages
5
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
48
Thank you vfone, do you know a good page for the equations of L, hight pass t and l networl?
 

volker@muehlhaus

Advanced Member level 5
Joined
Apr 11, 2014
Messages
2,658
Helped
1,007
Reputation
2,020
Reaction score
1,007
Trophy points
1,393
Activity points
17,032
If commercial matching synthesis software is an option, have a look here:
https://www.optenni.com/optenni-lab/overview

This is the most efficient and most comprehensive matching network synthesis package I have seen so far. Highly recommended!
 

Dan Mills

Advanced Member level 2
Joined
Nov 10, 2013
Messages
510
Helped
239
Reputation
478
Reaction score
229
Trophy points
43
Activity points
4,558
Build it up on a bit of copper clad and make some measurements!
That is how you learn about this stuff....

Regards, Dan.
 

volker@muehlhaus

Advanced Member level 5
Joined
Apr 11, 2014
Messages
2,658
Helped
1,007
Reputation
2,020
Reaction score
1,007
Trophy points
1,393
Activity points
17,032
Build it up on a bit of copper clad and make some measurements!
That is how you learn about this stuff....

I don't agree. Trial and error by pushing metal pieces works for narrow band cases. It is not very efficient for wide band matching and does not help at all to understand the matching procedure.
 

vfone

Advanced Member level 5
Joined
Oct 10, 2001
Messages
5,350
Helped
1,553
Reputation
3,109
Reaction score
1,166
Trophy points
1,393
Activity points
33,900
Yes, don't even think to get good performances for this wideband matching circuit without using the "optimize" option of an RF simulator.
Because the maximum frequency is relative high, very important is how to set all the parasitics in the optimization process.
In this broadband match circuit the main goal is related to a huge impedance transformation between input/output ports and central T network, which can get very low loaded-Q (below 1).
 

tlz

Newbie level 4
Joined
Feb 2, 2015
Messages
5
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
48
Thanks for the idea of the simulator, but I need to create .sp1 and all my data for inut and output are in pdf.
How can create .sp1?
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top