![]() ![]() For validation, a dual-band balanced BPF prototype is implemented. ![]() Thus, two passbands can be flexibly controlled by simultaneously tuning the above slots and size of the patch. Besides, slot perturbations on the patch are introduced to perturb the TM 21 resonant mode to independently adjust the center frequency of the higher passband, while the lower passband remains almost unchanged. In addition to the internal coupling, the above apertures are also further utilized for the undesired degenerate mode harmonic suppression. Two circular patches are properly coupled in the back-to-back form to realize a dual-passband balanced response by virtue of coupling apertures etched on the ground. The TM 11 mode and TM 21 mode of the resonator with odd-symmetric field distributions are explored to realize the desired differential-mode (DM) transmission and common-mode (CM) suppression. This letter presents a novel multilayer dual-band balanced bandpass filter (BPF) design by using two perturbed circular patch resonators. 3College of Medicine and Biological Information Engineering, Northeastern University, Shenyang, China.2School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing, China.1Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, Macau, China.Yanhui Xu 1 Zhengkang Liu 2 Shiyan Wang 2* Wanchun Tang 2 Junxin Chen 3
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