A compact triple‐mode bandpass filter based on isosceles right‐angled triangular resonator

Abstract

In this letter, a triple-mode bandpass filter based on isosceles right-angled triangular (RAT) resonator with three magnetic walls is proposed. To realize the triplemode filter, the RAT resonator is perturbed by two metalized via-holes around the center. These via-holes form an LC resonant unit with the patch. Also, the via-holes make mode shifting of the TM 010 Z mode while not affecting the TM 110 Z mode in order to form the passband. The proposed filter is fabricated and measured. The center frequency is 5.51 GHz and the fractional bandwidth is 20%. The minimum in-band insertion loss and return loss are measured to be 1.26 dB and 20.5 dB. The measurement results show that the filter has featured both compact size and excellent in-band responses. K E Y W O R D Scompact size, isosceles right-angled triangular resonator, magnetic walls, triple-mode bandpass filter

Novel balanced single/dual‐band bandpass filters based on a circular patch resonator

“…In this section, the proposed single-band and dual-band balanced BPFs are fabricated and characterized. Figure 19a The CM responses around 1.7 GHz is a little high, which is caused by the LC modes [41]. This mode is formed by the patches and perturbation vias, and only can be generated under CM excitation.…”

“…Most of the parameters of the dual-band balanced BPF are the same as the single-band one except that: φ 2 ¼ 45°, φ c ¼ 60°, l c = 3 mm, w c = 0.2 mm, l s ' = 8.6 mm, d s ' = 13 mm, w s ' = 2.5 mm, s' = 2 mm, l' i1 = l' i2 = 0 mm, h 0 1 = 0.508 mm, and h 0 2 = 0.338 mm. The simulated and measured results of the dual-band balanced BPF are plotted in Figure 20c The CM responses around 1.7 GHz is a little high, which is caused by the LC modes [41]. This mode is formed by the patches and perturbation vias, and only can be generated under CM excitation.…”

“…The CM responses around 1.7 GHz is a little high, which is caused by the LC modes [41]. This mode is formed by the patches and perturbation vias, and only can be generated under CM excitation.…”

Miniaturized single‐/dual‐band bandpass filters based on grounded square patch resonator with controllable passbands

“…A GSP resonator is realized by introducing a metallic via at the center of a patch. Due to the introduction of the metallic via, an additional mode nominated as LC mode 14 is generated, whose resonate frequency is lower than that of the fundamental mode of the non‐grounded patch resonator. The metallic via acts as an inductor, the patch acts as a capacitor, so an LC resonant unit is formed.…”

Novel dielectric waveguide filter using isosceles right‐angled triangular resonators

“…On this basis, researchers have attempted to apply a substrate to the waveguide filter model. The substrate integrated waveguide filter with planar structure, 3‐5 which has become an area of intense research interest, features a medium substrate with metal layers at the top and bottom. The metallized through‐hole array adjacent to it is used to form an electrical wall, thus forming a new guided wave structure.…”