Novel dual‐mode DC‐block triangular‐patch bandpass filter

Abstract

different cases graphically. It is found that, whether the component parameters are negative or not makes the guided modes in a slab waveguide change greatly, and besides, the values of the various components in the same classification will also have great effect on the existence of guided modes and the cutoff properties with imaginary transverse wave numbers.In addition, some peculiar mode properties in contrast to a slab of isotropic left-handed media are obtained: (i) under some specific conditions the guided modes have high-frequency cutoffs, whereas in an isotropic LHM slab the modes with real transverse wave numbers always have low-frequency cutoffs [6]. (ii) in case 2 and case 3, the guided modes with real transverse wave numbers are infinite, which has also been found in the study of the guided modes of a biaxial anisotropic slab waveguide placed in free space in reference [11], and the properties of mode cutoff in the two cases are not the same.ABSTRACT: A novel dual-mode DC-block bandpass filter (BPF) using a pair of V-shape slots on triangular-patch resonators is developed in this letter. The V-shape slots perturb the field distributions of triangularpatch resonators and excite degenerate modes. Compared to our previous research, the length of input/output (I/O) lines of the proposed filter is reduced so that the circuit becomes compact. Finally, the good agreement between the simulated and measured results of the proposed BPF is presented. Figure 1 Layout of the proposed dual-mode BPL Figure 2 Configuration of the V-shape slotFigure 3 Results and the photograph of the proposed dual-mode BPL.