Browse > Article

A Technique for Reducing the Size of Microwave Amplifiers using Spiral-Shaped Defected Ground Structure  

Lim, Jong-Sik (School of Electrical Engineering and Computer Science, Seoul National University)
Jeong, Yong-Chae (Division of Electronics and Information Engineering, Chonbuk National University)
Ahn, Dal (Division of Information Technology Engineering, SoonChunHyang University)
Nam, Sang-Wook (School of Electrical Engineering and Computer Science, Seoul National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.14, no.9, 2003 , pp. 904-911 More about this Journal
Abstract
A new method to reduce the size of microwave amplifiers spiral-shaped defected ground structure(Spiral-DGS) is proposed. A microstrip line having Spiral-DGS on the ground plane produces increased slow-wave factor and electrical length for the fixed physical length. In addition, it provides an excellent rejection characteristic for a finite frequency band like band rejection filters. The rejection band is used for rejecting harmonic components of amplifiers. The reduced microstrip line lengths in matching networks by Spiral-DGS are 39 % and 44 % of the original ones in input and output matching networks, respectively. It is shown that the measured S-parameters of the reduced amplifier agree well with those of the original amplifier. The measured second harmonic of the reduced amplifier is much less than that of the original amplifier by at least 10 dB. The same technique is applied to reject the third harmonic using the proper Spiral-DGS for the third harmonic frequency. The measured third harmonic is smaller than that of the original amplifier by 25 dB.
Keywords
Periodic Structure; DGS; Spiral-DGS;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Novel 2-D Photonic bandgap Structure for Microstrip Lines /
[ V.Radisic;Y.Qian;R.Coccioli;T.Itoh ] / IEEE Microwave Guide Wave Lett.   ScienceOn
2 A Uniplanar Compact Photonic-Bandgap(UC-PBG) Structure and its Applications for Microwave Circuits /
[ F.R.Yang;K.P.Ma;Y.Qian;T.Itoh ] / IEEE Trans. Microwave Theory Tech.   ScienceOn
3 결함된 접지 구조를 이용한 증폭기의 소형화 방법 /
[ 임종식;박준석;김철수;이영택;안달;남상욱 ] / 한국전자파학회논문지   과학기술학회마을
4 The Equivalent Circuit Modeling of Defected Ground Structure with Spiral Shape /
[ C.S.Kim;J.S.Lim;S.Nam;K.Y.Kang;J.I.Park;G.Y.Kim;D.Ahn ] / 2002 IEEE MTT-S Digest
5 A Spiral-Shaped Defected Ground Structure for Coplanar Waveguide /
[ J.S.Lim;C.S.Kim;Y.T.Lee;D.Ahn;S.Nam ] / IEEE Microwave and Wireless Components Letters   ScienceOn
6 Uniplanar One-Dimensional Photonic-Bandgap Structures and Resonators /
[ T.Y.Yun;K.Chang ] / IEEE Trans. Microwave Theory Tech.   ScienceOn
7 A Novel 1-D Periodic Defected Ground Structure for Planar Circuits /
[ C.S.Kim;J.S.Park;D.Ahn;J.B.Lim ] / IEEE Microwave Guide Wave Lett.   ScienceOn