Compact coupled line quadrature hybrid coupler with enhanced balance bandwidth

Author

Velidi, Vamsi Krishna ; Shankar, Girja ; Divyabramham, Kandimalla ; Sanyal, Subrata

Author_Institution

Dept. Electron. & Electr. Commun. Eng., Indian Inst. of Technol., Kharagpur, Kharagpur, India

fYear

2011

fDate

18-22 Dec. 2011

Firstpage

1

Lastpage

4

Abstract

A single stage quadrature hybrid coupler with enhanced flat balance over a wide bandwidth is presented in this article. The present coupler is realized by replacing the transmission line sections of the conventional two-branch coupler by their equivalent parallel coupled microstrip lines (PCML). The impedance controlled wide-bandpass response produced by the PCML is utilized to achieve flat balanced response over wider bandwidth that is comparable to that of a four-branch conventional coupler. A lossless transmission line model is used to derive the design equations along with design graphs. A prototype microstrip coupler having a wide ±1.0 dB amplitude balance of 71% is fabricated at 2.4 GHz to validate theoretical predictions.

Keywords

electric impedance; microstrip lines; transmission lines; amplitude balance; compact coupled line quadrature hybrid coupler; design equation; design graphs; enhanced balance bandwidth; enhanced flat balance; equivalent parallel coupled microstrip lines; flat balanced response; four-branch conventional coupler; impedance controlled wide-bandpass response; lossless transmission line model; microstrip coupler; single stage quadrature hybrid coupler; transmission line section; two-branch coupler; wide bandwidth; Bandwidth; Couplers; Couplings; Fabrication; Impedance; Microstrip; Power transmission lines; formatting; insert (key words); style; styling;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Electromagnetics Conference (AEMC), 2011 IEEE

Conference_Location

Kolkata

Print_ISBN

978-1-4577-1098-8

Type

conf

DOI

10.1109/AEMC.2011.6256874

Filename

6256874