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Impedance Calculators

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Impedance Calculators

Below is a collection of very useful impedance calculators. Please feel free to use them. If you have any suggestions for improvement please email feedback@mantaro.com. Also, please read our Disclaimer at the bottom of the page.

Discrete Structures:

Wire Inductance Calculator
Strap Inductance Calculator
Air Core Solenoid Calculator
Air Core Flat Spiral Inductance Calculator
Toroid Inductance Calculator
Mutual and Leakage Inductance Calculator
Twisted Pair Impedance Calculator
Coaxial Line Impedance Calculator
Skin Depth Calculator

PCB Structures:

Microstrip Impedance Calculator
Differential Microstrip Impedance Calculator
Differential Microstrip Impedance From Zo Calculator
Embedded Microstrip Impedance Calculator

Stripline Impedance Calculator
Differential Stripline Impedance Calculator
Differential Stripline Impedance From Zo Calculator
Asymmetric Stripline Impedance Calculator
Broadside Coupled Stripline Impedance Calculator

Plane Impedance Calculator
Capacitively Loaded Transmission Line Calculator

Signal Management:

Pi and Tee Attenuator Pad Calculator
Y and Delta Network Transformation Calculator
1:N Resistive Splitter Calculator
Return Loss and VSWR Calculator
Matching Network Calculator
Series to Parallel Impedance Conversion Calculator

Wire Inductance Calculator:

Strap Inductance Calculator:

Air Core Solenoid Calculator:

Air Core Flat Spiral Inductance Calculator:

Toroid Inductance Calculator:

Dimensional units: mm mils

len (Length) =
d1 (outer diameter) =
d2 (inner diameter) =
ur (relative permeability) =
N (number of turns) =

L (Inductance, nH) =

Mutual and Leakage_Inductance Calculator:

L1 (Inductance, uH) =
L2 (Inductance, uH) =




L1_leak (Inductance, uH)) =
L2_leak (Inductance, uH) =

Note: Calculations assume zero coil resistance

Twisted Pair Impedance Calculator:

Dimensional units: mm mils

s (wire separation) =
d (wire diameter) =
er (relative dielectric constant) =



Zo (Impedance, Ohms) =

Coaxial Line Impedance Calculator:

Dimensional units: mm mil

di (inner diameter) =
do (outer diameter) =
ur (relative magnetic permeability) =
er (relative dielectric constant) =



Zo (Impedance, Ohms) =

Skin Depth Calculator:

Dimensional units: metric english

rho (resistivity, nOhms*m) =
ur (relative magnetic permeability) =
TC (temp coefficient, ppm/C) =
T (operating temperture, Deg C) =
Fo (frequency, MHz) =
AWG (Wire Gauge) =

Default Material = Copper

Microstrip Impedance Calculator:

Note: valid for (w/h) from 0.1 to 3.0
Dimensional units: mm mils

w (trace width) =
t (trace thickness) =
h (dielectric thickness) =
er (relative dielectric constant) =

Zo (Single Ended Impedance, Ohms) =

Note: 1oz = 1.4mils = 0.03556mm

Differential Microstrip Impedance Calculator:

Note: valid for (w/h) from 0.1 to 3.0
Dimensional units: mm mils

w (trace width) =
d (trace separation) =
t (trace thickness) =
h (dielectric thickness) =
er (relative dielectric constant) =

Zd (Differential Impedance, Ohms) =

Note: 1oz = 1.4mils = 0.03556mm

Differential Microstrip Impedance From Zo Calculator:

Dimensional units: mm mils

Zo (single ended impedance, Ohms) =
d (trace separation) =
h (dielectric thickness) =

Zd (Impedance, Ohms) =

Embedded Microstrip Impedance Calculator:

Note: valid for (h1/h) greater than 1.2
Dimensional units: mm mils

w (trace width) =
t (trace thickness) =
h (trace dielectric thickness) =
h1 (overall dielectric thickness) =
er (relative dielectric constant) =

Zo (Impedance, Ohms) =

Note: 1oz = 1.4mils = 0.03556mm

Stripline Impedance Calculator:

Note: valid for (w/h) from 0.1 to 2.0 and (t/h) less than 0.25
Dimensional units: mm mils

w (trace width) =
t (trace thickness) =
h (dielectric thickness) =
er (relative dielectric constant) =

Zo (Impedance, Ohms) =

Note: 1oz = 1.4mils = 0.03556mm

Differential Stripline Impedance Calculator:

Note: valid for (w/h) from 0.1 to 2.0 and (t/h) less than 0.25
Dimensional units: mm mils

w (trace width) =
d (trace separation) =
t (trace thickness) =
h (dielectric thickness) =
er (relative dielectric constant) =

Zd (Impedance, Ohms) =

Note: 1oz = 1.4mils = 0.03556mm

Differential Stripline From Zo Impedance Calculator:

Dimensional units: mm mils

Zo (single ended impedance, Ohms) =
d (trace separation) =
h (dielectric thickness) =

Zd (Impedance, Ohms) =

Asymmetric Stripline Impedance Calculator:

Note: valid for (w/h) from 0.1 to 2.0 and (t/h) less than 0.25
Dimensional units: mm mils

w (trace width) =
t (trace thickness) =
h (smaller dielectric thickness) =
h1 (larger dielectric thickness) =
er (relative dielectric constant) =

Zo (Impedance, Ohms) =

Note: 1oz = 1.4mils = 0.03556mm

Broadside Coupled Stripline Impedance Calculator:

Note: valid for (w/h) from 0.1 to 2.0 and (t/h) less than 0.25
Dimensional units: mm mils

w (trace width) =
t (trace thickness) =
h (outer dielectric thickness) =
h1 (center dielectric thickness) =
er (relative dielectric constant) =

Zo (Impedance, Ohms) =

Note: 1oz = 1.4mils = 0.03556mm

Plane Impedance Calculator:

Dimensional units: mm mil

w (width) =
h (height) =
ur (relative magnetic permeability) =
er (relative dielectric constant) =

L (inductance, nH) =
C (capacitance, pF) =

Capacitively Loaded Transmission Line Calculator:

Dimensional units: mm inch

Zo (unloaded trace impedance, Ohms) =
Tpd (unloaded propagation delay, ps/unit len) =
Cl (distributed capacitve load, pf) =
len (transmission line Length) =

Zl (loaded Impedance, Ohms) =

Pi and Tee Attenuator Pad Calculator:

Port 1 Characteristic Impedance, Z1 (Ohms) =
Port 2 Characteristic Impedance, Z2 (Ohms) =
A (Attenuation, dB) =

Pi Attenuator Pad:
R1 ( Ohms) =
R2 ( Ohms) =
R3 ( Ohms) =
Tee Attenuator Pad:
R1 ( Ohms) =
R2 ( Ohms) =
R3 ( Ohms) =

Y and Delta Network Transformation Calculator:

Y Impedance, R1 (Ohms) =
Y Impedance, R2 (Ohms) =
Y Impedance, R3 (Ohms) =
Transform Y to Delta:

Delta Impedance, Ra (Ohms) =
Delta Impedance, Rb (Ohms) =
Delta Impedance, Rc (Ohms) =
Transform Delta to Y:

Add Series/ Parallel Resistor:

1:N Resistive Splitter Calculator:

Port Characteristic Impedance, Zo (Ohms) =
N (Number of split ports, 1:N) =
A (Attenuation, dB) =

Series Resistance - R1 ( Ohms) =
Shunt Resistance - R2 ( Ohms) =

Return Loss and VSWR Calculator:

Port Z1 Real, Imaginary Impedance (Ohms) =	,	j
Port Z2 Real, Imaginary Impedance (Ohms) =	,	j

Reflection Coefficient (Lin Mag,Deg) =		,
Return Loss = S11 (dB, Deg)=		,
Mismatch Loss (ML, dB)=
VSWR =

Matching Network Calculator:

Port Z1 Real, Imaginary Impedance (Ohms) =	,	j
Port Z2 Real, Imaginary Impedance (Ohms) =	,	j
Operating Frequency, Fo (MHz) =

Lower, Higher Impedance Port	Z_LOW=	Z_HIGH=
Option 1:
Series, Shunt Matching Impedance (Ohms)	ja=	jb=


Option 2:
Series, Shunt Matching Impedance (Ohms)	ja=	jb=

Series to Parallel Impedance Conversion Calculator:

Series Impedance (Z=a+jb) Ohms =	,	j
Parallel Impedance (Z=c//jd) Ohms =	,	j
Z (Ohms, Deg) =	,

r+jx (Ohms)	,	j
Operating Frequency (MHz) =
C (pF)
L (nH)
Reference Impedance (Z0r,jZ0i) Ohms =	,	j
VSWR =

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