Title :
A Stub Tapped Branch-Line Coupler for Dual-Band Operations
Author :
Zhang, Hualiang ; Chen, Kevin J.
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon
Abstract :
This letter presents a stub tapped branch-line coupler for dual-band applications. In the new design, a tapped stub is used to realize 90deg phase change at two frequencies. Both the characteristic impedance and the length of the proposed branch lines are adjusted accordingly compared with the conventional structure. Explicit design equations are derived using the ABCD-matrix. To verify the design concept, a microstrip coupler operating at 0.9 and 2GHz is fabricated and measured on a Rogers´ RO4003 board
Keywords :
matrix algebra; microstrip couplers; 0.9 GHz; 2 GHz; ABCD-matrix; Rogers RO4003 board; characteristic impedance; dual-band operations; microstrip coupler; stub tapped branch-line coupler; Coupling circuits; Dual band; Equations; Impedance; MMICs; Microstrip; Radio frequency; Shunt (electrical); Transmission line matrix methods; Transmission line theory; ABCD-matrix; Branch-line coupler; dual-band; monolithic microwave integrated circuit (MMIC); quarter-wavelength;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.890330
