A Novel Ka-Band Planar Balun Using Microstrip-CPS-Microstrip Transition

Author

Wu, Peng ; Zhang, Yong ; Dong, Yu-Liang ; Zhang, Qin

Author_Institution

EHF Key Lab. of Fundamental Sci., Univ. of Electron. Sci. & Technol. of China (UESTC), Chengdu, China

Volume

21

Issue

3

fYear

2011

fDate

3/1/2011 12:00:00 AM

Firstpage

136

Lastpage

138

Abstract

In this letter, a novel wideband 180° phase shifter with excellent phase and amplitude balance is presented and a new wideband millimeter-wave planar balun is proposed for the first time. The proposed balun consists of a wideband Wilkinson divider for power splitting followed by two microstrip-coplanar stripline (CPS)-microstrip transitions for broadband 180° phase shift. Good broadband phase and amplitude balance performances are achieved according to the inherent wideband characteristics of the Wilkinson divider and microstrip-CPS-microstrip transition and symmetry of the structure. A new ka-band planar balun has been fabricated and measured. Measured results show that the return loss, isolation, amplitude imbalance, and phase imbalance are better than 10 dB, 14.4 dB, 0.8 dB, and 3.1° , respectively, over the specified frequency range from 26.5 to 40 GHz.

Keywords

baluns; coplanar waveguides; microstrip lines; millimetre wave phase shifters; Ka-band planar balun; amplitude balance; broadband phase; frequency 26.5 GHz to 40 GHz; microstrip-CPS-microstrip transition; microstrip-coplanar stripline; phase balance; power splitting; wideband Wilkinson divider; wideband millimeter-wave planar balun; wideband phase shifter; Broadband communication; Impedance matching; Loss measurement; Microstrip; Resistors; Wideband; Wireless communication; Balun; Wilkinson divider; broadband 180$^{circ}$ phase shifter; planar;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2010.2104315

Filename

5710006