Yong-sheng Dai, Sheng-Lei Xiao, Zhong-Hua Ye, De-Long Lu, Wen-Kan Zhou, You-Fang Yao, Guang-Qiang Fu, Jie Zhang, Yu-Hong Guo, Shaozhong Chen
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A miniaturized wideband complementary LTCC diplexer based on transmission lines and lumped elements
This paper presented a design and simulation result of a miniaturized complementary diplexer realized by low-temperature co-fired ceramic (LTCC) technology. The diplexer consisted of two pass-bands, a central frequency of 1.175GHz with bandwidth of 46.8% and a central frequency of 1.925GHz with bandwidth of 28.6% respectively. In the presented structure, we used transmission lines to realize the characteristics of lower pass-band, while lumped circular inductors were adopted to achieve the requirements of upper pass-band. The interaction of the two filters was handled very well by using a complementary schematic. We managed to make the VSWR on the antenna port less than 1.7. The final three-dimensional model occupied a volume of 3.2×2.5×1.95-mm.
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