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A type of bandpass filter (BPF) based on the half-mode substrate integrated waveguide (HMSIW) loaded with dielectric rods is designed and developed. The proposed filter can operate below the characteristic cutoff frequency of HMSIW, thus compact size can be achieved. Some slots etched on HMSIW are used in the filter development to reduce coupling effects between the dielectric rods. Furthermore, an...
A novel approach to suppress mutual coupling (MC) between two patch antennas is presented in this letter. A parasitic isolator, which is printed between the two patches, controls the polarization of the coupling field to reduce the antenna coupling. Furthermore, a defected ground structure is employed to suppress the cross-polarization (XP) level. There exists a tradeoff between the MC reduction and...
Based on the theoretical formulation of the electromagnetic field distributions within a square patch resonator, an equivalent circuit and corresponding coupling model of the patch resonator for dual-mode filter operations are first constructed. Then, a circular hole (called as a perturbation element) etched on the patch itself with symmetric or antisymmetric to the excitation ports is studied. Further,...
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