Title :
A novel planar dual-band branch line coupler using defect ground structure
Author :
You, Changjiang ; Zhu, Xiaowei
Author_Institution :
State Key Lab of Millimeter Waves, Department of Radio Engineering, Southeast University, Nanjing, China 210096
Abstract :
A novel planar coupler with Defect Ground Structure (DGS) is proposed for application to the dual-band operation. In the new design, two cross coupling branches are added to the conventional branch line coupler at the middle. They give more flexibility to design for dual-band application. Using the DGS, high impedance microstrip line is implemented easily and the electrical length of microstrip line increases. The two operation frequencies could be designed more closely using high impedance implemented by DGS. For verification purpose, a compact microstrip dual-band coupler applied for TD-SCDMA and WiMax operation was designed, fabricated and measured. Experimental results are in agreement with predicted values.
Keywords :
Coupling circuits; Dual band; Etching; Frequency; Impedance; Inductance; Microstrip; Millimeter wave communication; Time division synchronous code division multiple access; WiMAX; Defect Ground Structure (DGS); branch line coupler; dual-band; microstrip line;
Conference_Titel :
Microwave Symposium Digest, 2008 IEEE MTT-S International
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
978-1-4244-1780-3
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2008.4633280
