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Home > Technologies
> Components >
Designing Wideband RF Impedance Transformers

Designing Wideband RF Impedance Transformers

This simplified design approach can lead to low-cost,
low-insertion-loss 1:4 impedance transformers capable of operating over
bandwidths as wide as three octaves.

Mar 15, 2007
Antonio Alves Ferreira, Jr., Jose Antonio Justino Ribeiro and Wilton Ney Do Amaral Pereira
|
Microwaves and RF

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What is in this article?:

Designing Wideband RF Impedance
Transformers

Conventional

Twisted
transmission line

Measurement
conditions

Summary

Impedance matching devices are often used in high-frequency circuits,
typically to match the impedance of a device or component to the characteristic
impedance of a circuit or system. In some circuits, it is desirable for the
impedance matching to achieve multiple-octave frequency coverage accompanied by
low insertion loss. To help designers working with impedance transformations,
this article explores the design of unbalanced-to-unbalanced (unun) wideband
impedance transformers with an impedance ratio of 1:4. Such transformers are
useful in radio communications systems, typically in hybrid circuits, signal
combiners and dividers, and for interstage coupling of amplifier chains.

Related

Evaluating
Impedance Transformers With A VNA

90-deg.
Hybrid Coupler Transforms Impedances

Matching An ADC
To A Transformer

Tackle
Wideband RF Switching With PIN Diodes

Such wideband unun impedance transformers are also useful for test circuits,
optical receiver systems,1 microwave circuits with wideband impedance
matching,2 and antenna coupling.3 Modern computational
programs usable for high-frequency circuit design and simulation include this
device in their tool boxes.4 A wideband unun impedance transformer
consists of a toroidal ferrite core wrapped with a twisted bifilar transmission
line, with the wires isolated by means of an enamel film. By combining design
elements of conventional and transmission-line impedance transformers, it is
possible to create a true wideband component. The design offers high efficiency
for an impedance transformation ratio of 1:4 (Fig.
1).5

Conventional »

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Discuss this Article 2

hamgoon

on Apr 10, 2015

Guys - how 'bout a PDF of this?

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ATGM

on Apr 21, 2015

Seconded - this multiple browser page format with a separate page for each
figure is virtually unuseable. Try reading it and see.

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