IEEE - Institute of Electrical and Electronics Engineers, Inc. - A Compact LTCC Decoupling-Network Based on Coupled-Resonator for Antenna Interference Suppression of Adjacent Frequency Bands.
|Author(s):||Ke-Wei Qian ; Guan-Long Huang ; Jia-Jun Liang ; Tao Yuan|
|Publisher:||IEEE - Institute of Electrical and Electronics Engineers, Inc.|
A low temperature co-fired ceramic (LTCC) coupled resonator decoupling network (CRDN) with asymmetric input/output (I/O) couplings for suppressing interference between two adjacent frequency bands... View More
A low temperature co-fired ceramic (LTCC) coupled resonator decoupling network (CRDN) with asymmetric input/output (I/O) couplings for suppressing interference between two adjacent frequency bands is proposed in this paper. Based on LTCC multilayer technology, a second order CRDN module is realized by strongly coupled semi-lumped LC resonators in a very small volume of 3.2 mm×2.5 mm×1.2 mm. A wide range of mutual admittance and different selfadmittances of the CRDN can be realized by adjusting the asymmetric I/O couplings. Thus a satisfactory decoupling performance covering two contiguous bands, as well as good matching in each band can be realized without additional matching networks. To prove the concept, two planar inverted-F antennas working in TD-LTE and Wi-Fi frequency bands, along with the corresponding decoupling network are designed, fabricated and tested. Measured results have demonstrated that more than 15 dB isolation improvement can be achieved within the two operating bands, showing the feasibility of this "one-fit-all" integrated solution. More importantly, the design methodology and circuit topology presented in this work are general and can be applied to practical MIMO system applications.View Less