A Compact Multilayer Dual-Mode Substrate Integrated Circular Cavity (Sicc) Filter for X-Band Application

Abstract

Abstract-A high-performance multilayer dual-mode filter is developed based on the substrate integrated waveguide circular cavity (SICC) in this paper. The filter is constructed with two circular cavities and each cavity supports two degeneration modes, which can be generated and controlled by the coupling aperture and slot located between layers. Detailed design process is introduced to synthesize an X-band dual-mode dual-layer filter. It not only has the good performances, but also reduces the circuit size much more. Moreover, it can be found that the upper side response of the filter is very steep. Good agreement is obtained between the simulated and measured results of the proposed structure.

A Substrate Integrated Waveguide Bandpass Filter Using Novel Defected Ground Structure Shape

“…According to the comparisons, although the return losses of the filters in [24,25] are quite good, their insertion losses are much higher than that of the proposed one, which is mainly contributed by the transmission loss of inter-coupling between adjacent cavities and the radiation loss. Compared with the proposed filter, due to the narrow band, the cross-layer aperture coupling and multilayered structure, the multilayered filters reported in [9,10,12,27] have higher insertion loss, larger sizes and higher fabrication price. Although the SIW-DGS filter in [26]-2 and the SIW-CSRR filter in [28] have good performance on the whole, as a tradeoff of insertion loss, return loss and size, they are inconvenient to do system integration owing to their DGS and CSRR etched into the bottom metal cover.…”

“…The first one is to utilize the multilayer low temperature co-fired ceramic (LTCC) and printed circuit board (PCB) process to develop the three dimensional substrate integrated circular and elliptic cavity (3D SICC and SIEC) [8][9][10] and the folded substrate integrated waveguide [11,12]. It can make the SIW cavities to be folded and to couple with each other in the vertical direction, so that the component's size can be reduced greatly.…”

Design Filters Using Tunable E-Shaped Dual-Mode Resonators for Lower-Ultra-Wideband and Upper-Ultra-Wideband Applications

“…The open-circuited stub at the centre of the E-shaped SIR introduces another transmission pole near the fundamental resonance frequency of the SIR. Therefore the proposed structure is a dual-mode resonator [32][33][34].…”

A Novel Dual Mode Substrate Integrated Waveguide Filter With Mixed Source-Load Coupling (Mslc)

“…Besides, a SIW filter with cascading two adjacent dual-mode resonators is designed to generate up to two transmission zeros in [24]. Similarly, by constructing with two circular cavities, a dual mode filter with two transmission zeros at upper side of the passband is presented in [25].…”