Microstrip Filter Design Tool
Design distributed-element microstrip filters with low-pass or band-pass response, and stubs, stepped impedance or interdigital topology. Select any dielectric substrates, such as PCB or Alumina, and calculate the precise layout dimensions.
Tool Description
Microstrip Filter Design Tool is a web-based application for distributed-element microstrip filter synthesis. It is feature rich, user-friendly and available for free from any desktop or mobile device.
Note: The design is a first approximation and should be subsequently verified/optimized in a 3D electromagnetic simulation.
Features
- One-click synthesis from a given specifications
- Precise layout dimensions on any dielectric substrate
- Interdigital topology
- Chebyshev or Butterworth filter types
- Arbitrary input and output impedances
Contents
- 1 Lowpass Filters
- 1.1 Stubs (semi-lumped)
- 1.2 Stepped Impedance
- 2 Bandpass Filters
- 1.1 Interdigital
1 Lowpass Filters
1.1 Stubs (semi-lumped)
1.1.1 Layout
W0 - input and output feed-lines width.
W1 - series lines width.
W2 - stubs width.
Sk - the kth stub length, where the stubs are numbered from left to right starting with 1.
Lk - the kth line length, where the lines are numbered from left to right starting with 1.
1.1.2 Special Parameters
Line Low Impedance (Ω) - the characteristic impedance of the low impedance lines.
Line High Impedance (Ω) - the characteristic impedance of the high impedance lines.
Line Order - control whether the leftmost section is a low impedance line or a high impedance line.
1.2 Stepped Impedance
1.2.1 Layout
W0 - input and output feed-lines width.
W1 - high impedance lines width.
W2 - low impedance lines width.
Lk - the kth line length, where the lines are numbered from left to right starting with 1.
1.2.2 Special Parameters
Line Low Impedance (Ω) - the characteristic impedance of the low impedance lines.
Line High Impedance (Ω) - the characteristic impedance of the high impedance lines.
Line Order - control whether the leftmost section is a low impedance line or a high impedance line.
2 Bandpass Filters
2.1 Interdigital
2.1.1 Layout
W0 - input and output feed-lines width.
W - resonators width.
L - resonators length.
e - the extension in length of the leftmost and rightmost resonators.
t - the input and output feed-lines tapping point.
Sk - the spacing between the kth and (k+1)th resonators, where the resonators are numbered from left to right starting with 1.
2.1.2 Special Parameters
Resonator Impedance (Ω) - the characteristic impedance of the resonators.