Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes USAF radar shop Notable Quotes App Notes Calculators Education Engineering Magazines Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Stencils for Visio RF & EE Shapes for Word Advertising RF Cafe Homepage Sudoku puzzles Thank you for visiting RF Cafe!
Exodus Advanced Communications

Lumped / Distributed Transmission Line Element Conversions
When designing with transmission line elements, whether with microstrip, stripline, waveguide, or coaxial cable, it is sometimes necessary to create lumped element equivalents for shunt and series capacitors and inductors.









These formulas provide the conversion. Keep in mind that the conversions only hold exactly at one frequency, ω. Angles, θ, are portions of a full wavelength at the desired frequency.


Inductor Shunted to Ground
RF Cafe - Lumped inductor shunt inductor RF Cafe - Distributed inductor shunt to ground equivalent
Capacitor Shunted to Ground
RF Cafe - Lumped element capacitor to ground RF Cafe - Distributed element open stub equivalent
Parallel LC Shunted to Ground
A 90° transmission line shorted at the far end acts like a parallel LC tank circuit. To behave similarly, the reactance of the tank inductor will be equal to 4/π times the line impedance.
RF Cafe - Lumped element parallel LC tank to ground RF Cafe - Distributed element parallel LC tank to ground equivalent
Series LC In Series
RF Cafe - Lumped element series LC RF Cafe - Distributed element series LC
Series Inductor
RF Cafe - Lumped element series inductor RF Cafe - Distributed element series inductor equivalent
Shunt Capacitor
RF Cafe - Lumped element shunt capacitor RF Cafe - Distributed element series component equivalent
Series LC Shunted to Ground
A 90° transmission line left open at the far end acts like a series LC circuit. To behave similarly, the reactance of the tank inductor will be equal to π/4 times the line impedance.
RF Cafe - Lumped element series LC tank to ground RF Cafe - Lumped element series LC tank to ground equivalent

Information originated from "HF Filter Design and Computer Simulation
Qorvo / Custom MMIC CMD242K4 GaAs Distributed Amplifier - RF Cafe MPDevice microwave devices - RF Cafe
NorthEast RF Antenna Testing Services LadyBug Technologies LB479A RF Power Sensor - RF Cafe
About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,
    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:  AirplanesAndRockets.com

spacer

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free