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

How to calculate the width of transmission lines for matching?

Status
Not open for further replies.
M

MobiNaz

Full Member level 3
Joined
Aug 11, 2010
Messages
163
Helped
5
Reputation
10
Reaction score
4
Trophy points
1,298
Location
SYDNEY
Activity points
2,432
Hello everyone,

I am trying to make a single diode harmonic mixer with a RF matching network at the input (5.25GHz) and IF matching network at the output (10.5GHz). I am trying to use transmission lines and stubs in a substrate of Er = 2.2. How do I calculate the width of the lines?

Should I match at one frequency or my approach is correct?

Thanks
 

Re: Matching

go here for microstrip lines and their impedance calculations

**broken link removed**


cheers
Dave
VK2TDN
 

    M

    MobiNaz

    Points: 2
    Helpful Answer Positive Rating
Re: Matching

you can also consider AppCad (freeware available everywhere) passive circuits tools for this.
 

    M

    MobiNaz

    Points: 2
    Helpful Answer Positive Rating
Re: Matching

First all thank out everyone for your replies. Secondly, my design has patch antennas operating at 5.25 GHz and 10.5GHz, there dimensions are very small. If I use the above calculators, I am getting the width of transmission line around 4.9 mm, which is comparable to my patch dimensions. When I take arbitrary width of 0.02mm I get the following results. Does that mean that my circuit is matched close at 50 Ohm?

The figure shows S11 and S22
 

Re: Matching

What I mean is I am using the width of the transmission line to match my real part of the impedance and length for matching the inductance. Is it oky? I am getting correct simulation results. Will this approach have any problems in the manufactured design?
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top