Analytical method for optimal design of RF dual-band rat-race couplers for arbitrary frequency ratios

Authors:
Pouya Aflaki;Fadhel M. Ghannouchi;Renato Negra
Affiliations:
ECE Department, iRadio Laboratory, Schulich School of Engineering, University of Calgary 2500, University Drive NW, Calgary, AB, Canada T2N 1N4;ECE Department, iRadio Laboratory, Schulich School of Engineering, University of Calgary 2500, University Drive NW, Calgary, AB, Canada T2N 1N4;Mixed Signal CMOS Circuits, UMIC Research Centre, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany
Venue:
International Journal of RF and Microwave Computer-Aided Engineering
Year:
2012

Citing 3
Cited 0

Analysis of class-DE amplifier with linear and nonlinear shunt capacitances at 25% duty ratio

IEEE Transactions on Circuits and Systems Part I: Regular Papers - Special section on 2009 IEEE custom integrated circuits conference
Optimal design of a CMOS op-amp via geometric programming

IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
A state-space behavioral model for CMOS class E power amplifiers

IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems

Quantified Score

Hi-index	0.00

Visualization

Abstract

This article presents an analytical method to design a hybrid structure dual-band rat-race coupler at microwave frequencies. The proposed structure uses six identical cells of which each is engineered to work as a quarter wavelength transmission line with proper characteristic impedance at two distinct frequencies having arbitrary frequency ratio. The performances of the π- and T-cells are studied to assess their ability to provide the required electrical parameters for dual-band operation. It is demonstrated that the single-section π-topology can only lead to a suboptimal design for a dual-band rat-race cell at two nonharmonic frequencies. In contrast, the proposed double-section π-cell structure allows achieving an optimal dual-band cell design. A dual-band rat-race coupler designed at 2.14 and 3.6 GHz has been simulated and fabricated in hybrid microstrip technology. Measurement results agree well with analytically based simulation results, which demonstrate the effectiveness of the proposed structure for dual-band operation. © 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE 22: 690–700, 2012. © 2012 Wiley Periodicals, Inc.