Title :
A compact branch-line coupler using π-equivalent shunt-stub-based artificial transmission lines
Author :
Wu, Chi-Hsing ; Tseng, Chao-Hsiung
Author_Institution :
Dept. of Electron. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan
Abstract :
In this paper, a compact branch-line coupler is developed using π-equivalent shunt-stub-based artificial transmission lines (SSB ATLs). A conventional quarter-wavelength microstrip can be equivalent to a SSB ATL realized by a series high-impendance microstrip with two sets of branch-type shunt stubs. The circuit configuration of the SSB ATL is beneficial to miniaturize the circuit size using the folding technique. At the design frequency 0.9 GHz, the developed branch-line coupler occupies about 8% of the conventional design.
Keywords :
coupled transmission lines; electric impedance; microstrip couplers; π-equivalent shunt-stub-based artificial transmission line; branch-type shunt stub; circuit configuration; circuit size; compact branch-line coupler; folding technique; frequency 0.9 GHz; quarter-wavelength microstrip; series high-impedance microstrip; Amplitude modulation; Couplers; Integrated circuit modeling; Microstrip; Power transmission lines; Transmission line measurements; Wireless communication; artificial transmission line (ATL); branch-line coupler; miniaturization;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2010 Asia-Pacific
Conference_Location :
Yokohama
Print_ISBN :
978-1-4244-7590-2
Electronic_ISBN :
978-1-902339-22-2
