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K-band Predistortive Linearizer of Reflective Diode Structure for Satellite TWTA Using Carrier Complex Power Series  

Jeong Hee-Young (Department of Information & Communication Engineering, Chonbuk National University)
Jeong Yong-Chae (Department of Information & Communication Engineering, Chonbuk National University)
Yom In-Bok (Communications Satellite RF Technology Team, ETRI)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.6, 2005 , pp. 644-651 More about this Journal
Abstract
In this paper, a new predistortion method to reduce nonlinearity or a traveling wave tube amplifiers(IWTAs) is proposed. Nonlinear transfer characteristics of TWTA are analyzed using carrier complex power series. Inverse carrier complex power series or a predistortion linearizer to linearizer TWTA are also proposed. The inverse nonlinear distortion characteristics of predistorter can be realized with reflective structure that is composed of Schottky diode and resistive-terminated transmission line. The AM-to-AM and the AM-to-PM characteristics for TWTA by proposed predistortive linearizer on K-band were improved from -5.825 dB and -37.321^{\circ} to 0.786 dB and 6.742^{\circ}, respectively.
Keywords
Predistorter; Schottky Diode; AM-to-AM; AM-to-PM; Satellite; TWTA;
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