A Compact Slow-Wave Microstrip Branch-Line Coupler With High Performance

Author

Wang, Jianpeng ; Wang, Bing-Zhong ; Guo, Yong-Xin ; Ong, L.C. ; Xiao, Shaoqiu

Author_Institution

Univ. of Electron. Sci. and Technol. of China, Chengdu

Volume

17

Issue

7

fYear

2007

fDate

7/1/2007 12:00:00 AM

Firstpage

501

Lastpage

503

Abstract

One compact slow-wave microstrip branch-line coupler is presented. The new structure not only effectively reduces the occupied area to 28% of the conventional branch-line coupler at 2.0 GHz, but also has high second harmonic suppression performance. The measured results indicate a bandwidth of more than 200 MHz has been achieved while the phase difference between S₂₁ and S₃₁ is within 90deg plusmn 1deg. Furthermore, the measured insertion loss is comparable to that of a conventional branch-line coupler. The new coupler can be easily implemented by using the standard printed-circuit-board etching processes and is very useful for wireless communication systems.

Keywords

harmonic generation; microstrip circuits; slow wave structures; waveguide couplers; frequency 2.0 GHz; insertion loss; phase difference; printed circuit board etching; second harmonic suppression; slow wave microstrip branch line coupler; wireless communication systems; Bandwidth; Coupling circuits; Frequency; Harmonics suppression; Impedance; MMICs; Microstrip; Microwave integrated circuits; Monolithic integrated circuits; Resonance; Branch-line coupler; microstrip; slow-wave structures;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2007.899307

Filename

4266851