A transformer of one-third wavelength in two sections - For a frequency and its first harmonic

被引：99

作者：

Chow, YL ^{[1
]}

Wan, KL ^{[1
]}

机构：

[1] City Univ Hong Kong, Wireless Commun Res Ctr, Kowloon, Hong Kong, Peoples R China

来源：

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2002年 / 12卷 / 01期

关键词：

dual frequencies; one-third wave transformer; transmission-line;

D O I：

10.1109/7260.975723

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The quarter-wave transformer transforms in one frequency f(0), but not its first harmonic 2 f(0). The transform in 2 f(0) is needed in a dual-hand operation of GSM and PCS. This requirement can be fulfilled in a two line-sections of 1 / 6 wavelengths each, adding to 1 / 3 wavelengths for the total transformer length in the lower band centering at f(0) (fundamental), or 2/3 wavelengths in the upper band centering at 2f(0) (1st harmonic). The 1/3-wave transformer is analytically inexact but effectively exact for engineering applications. For example, for impedance transforms of K = 4, the inexactness gives a reflection of \Gamma\ = 0.013.

引用

页码：22 / 23

页数：2