A cascaded coupled resonator decoupling network for mitigating interference between two radios in adjacent frequency bands
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AbstractA new microwave device called the cascaded type of coupled resonator decoupling network (C-CRDN) is proposed in this paper. The four-port device can be used to reduce the interference between two radio systems that work in adjacent or even contiguous frequency bands. A C-CRDN is cascaded between the two antennas to be decoupled and the I/O ports of their radio systems, respectively. The coupling matrix of a C-CRDN can be designed to meet the required isolation and return-loss specifications. To prove the concept, a fourth- and sixth-order C-CRDN using coaxial combline cavities are designed, fabricated, and measured according to the characteristics of a testing array that consists of two high-gain sleeve dipoles working in the adjacent time-division long-term evolution and wireless fidelity bands. The measured results have demonstrated that the proposed C-CRDN can effectively mitigate the coexistence interference between the two collocated systems by providing at least 20-dB isolation improvement and enhanced matching performance. The proposed technique is general and can find many applications in heterogeneous wireless systems.
All Author(s) ListZhao L., Qian K.-W., Wu K.-L.
Journal nameIEEE Transactions on Microwave Theory and Techniques
Volume Number62
Issue Number11
PublisherInstitute of Electrical and Electronics Engineers
Place of PublicationUnited States
Pages2680 - 2688
LanguagesEnglish-United Kingdom
KeywordsCo-located transceivers, in-device coexistence (IDC), interference suppression, long-term evolution (LTE), microwave passive network, mutual coupling, wireless fidelity (Wi-Fi)

Last updated on 2020-14-08 at 00:27