Title :
A design of amplifier using harmonic termination matching tuner and harmonic blocking bias line
Author :
Kim, Su-Tae ; Lee, Jin-Kuk ; Jeong, Yong-Chae ; Park, Kyo-Ho ; Lim, Jong-Sik ; Kim, Chul-Dong
Author_Institution :
Dept. of Inf. & Commun. Eng., Chonbuk Nat. Univ., Chonju, South Korea
Abstract :
In this paper, a new 3dB branch line hybrid using asymmetric defected ground structure (DGS) microstrip is proposed. The proposed branch line suppresses the 2nd and the 3rd harmonic component effectively. If transmission line having the arbitrary electrical length is connected at the through and the coupled port of DGS branch line hybrid, then DGS branch line hybrid is operated as impedance transforming tuner. Also a new DGS λ/4 bias line that can suppress high frequency harmonics as well as low frequency intermodulation is proposed. With harmonic termination tuner using the proposed hybrid and harmonic blocking bias line, the 2nd and the 3rd harmonic components of the fabricated amplifier that operated in IMT-2000 band were suppressed up 25dB and 27dB respectively. Harmonic load-pull setup of amplifier can be easily accomplished with proposed circuits.
Keywords :
3G mobile communication; UHF amplifiers; harmonics suppression; microstrip lines; IMT-2000 band; amplifier; analogue circuit design; asymmetric defected ground structure microstrip; harmonic blocking bias line; harmonic termination tuner; hybrid blocking bias line; matching tuner; microstrip transmission line; Circuits; Couplings; Frequency measurement; Impedance measurement; Microstrip; Power harmonic filters; Shape; Spirals; Transmission lines; Tuners;
Conference_Titel :
Microwave Conference, 2005 European
Print_ISBN :
2-9600551-2-8
DOI :
10.1109/EUMC.2005.1608858
