microstrip filter design

[pritihiviraj]

how to find out the electrical length for any feed line for the better impedence matching?

 

[PlanarMetamaterials]

Hi pritihiviraj,

Obtain its scattering parameters. The phase of S21 is Beta*d, where Beta is the phase constant (equal to 2*pi/wavelength) and d is the physical length.

 

[pritihiviraj]

how to get design a design equations for the open loop ring resonator? i'm really getting more trouble in this...

 

[husseintt]

One solution is to run the feed line separately with a 50 ohm lumped port or wave port at each end of the line. Use parametric analysis by changing the length of the line, from the resultant S11/S21 you can estimate the good length of the feed line which gives S11 < -20 dB and S21 > -0.5 dB in the interested bandwidth .....

I believe that the length of the line shouldn't affect the values of S11/S21 that much ..... plz let us know your findings if you will follow this method

 

[husseintt]

I just do not understand why the phase of S21 is Beta*d

Thanks for the clarification

 

[PlanarMetamaterials]

I just do not understand why the phase of S21 is Beta*d

The phase of s21 is equal to the phase at port 2 relative to the phase at port 1. Since Beta is the rate at which phase changes with distance (measured in rad/m), Beta times the length travelled in meters will give the the total phase incurred.

 

[husseintt]

The phase of s21 is equal to the phase at port 2 relative to the phase at port 1. Since Beta is the rate at which phase changes with distance (measured in rad/m), Beta times the length travelled in meters will give the the total phase incurred.

PlanarMetamaterials

Thanks a lot

 

[pritihiviraj]

can we optimize the whole layout by bringing it into schematic and setting goals for the S11 and S21 in ADS

 

[pritihiviraj]

why i"m getting this below error when i'm optimizing my design in ADS2011
******************************************
***** Abnormal Simulator Termination *****
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The simulator has unexpectedly terminated.