Title :
A compact LTCC branch-line coupler UsingModified-T equivalent-circuit modelfor transmission line
Author :
Kuo, Tsung-Nan ; Lin, Yo-Shen ; Wang, Chi-Hsueh ; Chen, Chun Hsiung
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
In this letter, a compact branch-line coupler is proposed by making good use of the three-dimensional layout capability of the low-temperature co-fired ceramic (LTCC) substrate. This branch-line coupler is accomplished by using lumped-inductors and lumped-capacitors to realize the modified-T equivalent-circuit model for the transmission line so that the circuit size may drastically be reduced. Specifically, a very compact LTCC branch-line coupler with a size of 0.079λ×0.0717λ is implemented and carefully examined, where λ is the wavelength of the multilayer structure at the operating frequency f0.
Keywords :
ceramics; coupled transmission lines; equivalent circuits; microstrip lines; waveguide couplers; compact branch-line coupler; low-temperature co-fired ceramic; lumped capacitors; lumped inductors; modified-T equivalent-circuit model; multilayer structure; transmission line; Ceramics; Coplanar transmission lines; Coplanar waveguides; Coupling circuits; Dielectric substrates; Distributed parameter circuits; Frequency; Nonhomogeneous media; Power transmission lines; Transmission lines; Branch-line coupler; low-temperature co-fired ceramic (LTCC);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.863194
