Matching characteristics of the physically short linear impedance transformer

Abstract

In contrast to the conventional quarter-wavelength transformer for matching two transmission lines of different characteristic impedance, it has been found that the length can be significantly shortened by using two stratified line sections in cascade. The frequency response of this short-length transformer (SLT) is investigated and it is shown that asymmetry and a reduction in matching bandwidth is the price to be paid for a shorter length. A comparison has also been made with the short-step transformer of Matthaei, which also provides a reduction in length.