Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Manufacturers & Services Consultants Engineer Jobs Twitter LinkedIn Advertise on RF Cafe! Engineering Books Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar Day in History RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Bookstore Calculators Education Engineering Organizations Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings Advertisers Websites RF Cafe Archives Test Notes Slide Rules RF Cascade Workbook RF Stencils for Visio Shapes for Word Thank you for visiting RF Cafe!

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger
BSEE
KB3UON
EIEIO

Carpe Diem!
(Seize the Day!)

5th MOB:
My USAF radar shop

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse riding website

Kuroda's Identities (Transforms)

Kuroda Identities (aka Kuroda Transforms) are used to convert a section of transmission line with an open parallel stub into an electrically equivalent section of transmission line with a shorted series stub. As a result, an identical S-parameter matrix is produced that performs the same function. The technique is handy when designing distributed element circuits where one configuration is possible and the other is not. Filters are a good example, because in the physical layout open parallel stubs are difficult (or impossible) to realize whereas series shorted series stubs are.

I remember learning of the Kuroda Transform right after graduating and being assigned to do a set of four bandpass filters for an L-band switched filter. Those were the days of Touchstone on a Unix box where net list inputs were the norm rather than handy GUI interfaces. It was mesmerizing to watch the optimizer crank through successive iterations and draw increasingly perfect bandpass responses  - with the necessary group delay parameters - in an impressive array of colors (16-color CGA everyman's PC display of the era). But then I digress.

The Kuroda Identities shown here are custom reproductions of versions that can be found in hundreds of other sources.



For all four transforms, use  n2 = 1 + Z2/Z1, and the rectangular boxes are λ/8 transmission line sections with the indicated characteristic impedances.

Kuroda Identity (Transform) Parallel Capacitor Input - RF Cafe

Kuroda Identity (Transform) Parallel Capacitor Input



Kuroda Identity (Transform) Series Inductor Input - RF Cafe

Kuroda Identity (Transform) Series Inductor Input



Kuroda Identity (Transform) Parallel Inductor Input - RF Cafe

Kuroda Identity (Transform) Parallel Inductor Input



Kuroda Identity (Transform) Series Capacitor Input - RF Cafe

Kuroda Identity (Transform) Series Capacitor Input


Try Using SEARCH to Find What You Need.  >10,000 Pages Indexed on RF Cafe !

Copyright 1996 - 2016
Webmaster:  Kirt Blattenberger, BSEE - KB3UON
Family Websites:  Airplanes and Rockets | Equine Kingdom

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