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High Selectivity Coupled Line Impedance Transformer with Second Harmonic Suppression
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 Title & Authors
High Selectivity Coupled Line Impedance Transformer with Second Harmonic Suppression
Kim, Phirun; Park, Junsik; Jeong, Junhyung; Jeong, Seungho; Chaudhary, Girdhari; Jeong, Yongchae;
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 Abstract
This paper presents a design of an impedance transformer (IT) with high frequency selectivity characteristics. The frequency selectivity can be controlled by even- and odd-mode impedance of a shunt coupled transmission line (TL). For experimental validation, a 50- to IT was implemented at a center frequency () of 2.6 GHz for the long-term evolution signal. The measured results were in good agreement with the simulations, showing a return loss higher than 19 dB over a passband bandwidth of 0.63 GHz (2.28-2.91 GHz) and good sharp frequency selectivity characteristic near to the passband. The series coupled TL provides a transmission zero at 5.75 GHz, whereas the shunt coupled TL provides three transmission zeros located at 2 GHz, 3.1 GHz, and 7.14 GHz.
 Keywords
Coupled Line;Impedance Transformer;Selectivity;Transmission Zeros;
 Language
English
 Cited by
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