A compact LTCC branch-line coupler UsingModified-T equivalent-circuit modelfor transmission line |
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Authors: | Tsung-Nan Kuo Yo-Shen Lin Chi-Hsueh Wang Chun Hsiung Chen |
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Affiliation: | Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan; |
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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 0.079/spl lambda//spl times/0.0717/spl lambda/ is implemented and carefully examined, where /spl lambda/ is the wavelength of the multilayer structure at the operating frequency f/sub 0/. |
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