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Differential Dual-Band Filter Using Ground Bar-Loaded Dielectric Strip Resonators
IEEE Microwave and Wireless Components Letters ( IF 2.374 ) Pub Date : 2019-12-20 , DOI: 10.1109/lmwc.2019.2957980
Zhen Tan; Qing-Yuan Lu; Jian-Xin Chen

In this letter, a new differential dielectric strip resonator (DSR) filter with dual passbands is proposed. By loading a pair of ground bars underneath the traditional half- wavelength ( $\lambda /2$ ) DSR with high permittivity (supported by a low-permittivity substrate with the bottom ground plane), the TM 10 and TM 30 modes can be controlled to be in a close spacing. Meanwhile, both of them can be differentially excited for the design of the differential dual-band bandpass filter (BPF). The external quality factors and coupling coefficients for both bands can be independently controlled through proper layout; meanwhile, the common-mode (CM) suppression in the two differential-mode (DM) passbands is more than 25 dB. Finally, a differential DSR BPF with dual-band response operating at 8.13 and 11.13 GHz is given to verify the proposed idea.
更新日期:2020-02-14

 

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