microwave calculators noise figure

ieee mtt mtt-s microwave vswr RF calculator

skin depth cpw calculator pin diode

directional coupler smith chart microwave dictionary

July 30, 2014
phased array frequency meter

microwave jobs career recruiting antennas twitter

bandwidth microwave measurements

noise figure phase shifter microwave encyclopedia

s parameters waveguide variable attenuator acronyms

All

loader

1-9

loader

A

loader

B

loader

C

loader

D

loader

E

loader

F

loader

G

loader

H

loader

I

loader

J

loader

K

loader

L

loader

M

loader

N

loader

O

loader

P

loader

Q

loader

R

loader

S

loader

T

loader

U

loader

V

loader

W

loader

X

loader

Y

loader

Z

loader
advertisement

internet of things ios attenuator calculator

Microstrip Via Hole Inductance

Click here to go to our main page on microstrip

Click here to go to our page on inductor mathematics

Click here to go to our main page on MMIC design

Here we will provide an equation that allows you to calculate the inductance of a single ground via in a microstrip circuit board.

This is based on the IEEE paper "Modeling Via Grounds in Microstrip" IEEE Microwave and Guided Wave Letters, Vol. 1, No. 6, June 1991, by Goldfarb and Pucel. It is Equation 3 in the reference.

Note that this is an empirical solution that was found to fit data where the height was between 100 um and 631 microns. It is supposed to be valid for heights less that 3% of a wavelength. Note: this equation was slightly wrong until August 2009, sorry for the inconveinece. Thanks, Vitaley! The plots below were correct, just the equation graphic.

Microstrip Via Hole Inductance

New for August 2009! We placed a spreadsheet in the download area that provides this calculation and was used to prepare the plots on this page.

Although Goldfarb and Pucel didn't tell you, the units of all of the lengths have to be in meters, then the answer comes out in Henries. We entered the equation into a spreadsheet. Here is the inductance for a via hole in on 15, 10, 4 and 2 mil substrates:

Microstrip Via Hole Inductance

Microstrip Via Hole Inductance

Microstrip Via Hole Inductance

Microstrip Via Hole Inductance

In many cases it is desirable to keep the D/H ratio to 0.5 to minimize the catch-pad area (especially on MMICs).

Via hole inductance rule of thumb(s)

Microstrip Via Hole Inductance On two-mil (50 micron) GaAs, Lvia is about 10 pico-henries. For four-mil (100 um) GaAs, it is about 20 pico-Henries. Note that thes rules are most accurate for D/H aspect ratio of about 0.5.

Author: Unknown Editor

advertisement

mobile app designers california