Half Mode Substrate Integrated Folded Waveguide (Hmsifw) and Partial H-Plane Bandpass Filter

Abstract

Abstract-In this paper, a half mode substrate integrated with folded waveguide (HMSIFW) and a HMSIFW partial H-plane bandpass filter are proposed. The proposed filter employs H-plane slot of open-ended evanescent waveguide and H-plane septa of short-ended evanescent waveguide as admittance inverter and impedance inverter, respectively. The filter has advantages of convenient integration, compact size, low cost, mass-producibility and ease in fabrication. In order to validate the new proposed topology, a four-pole ultra-narrowband bandpass filter, with quarter wavelength resonators, is designed and fabricated using standard printed circuit board process. The tapered line is used as transition between HMSIFW and microstrip-line for easy integration and measurement. The measured results are in good agreement with simulated ones, and good selectivity is achieved.

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.…”

A Novel Synthesis Technique for Microwave Bandpass Filters With Frequency-Dependent Couplings

“…Substrate-integrated waveguide SIW technology [15][16][17][18] offers easy fabrication, higher-quality factors than other planar circuits, repeatability, and a relatively low cost of production. Since SIW operates as a rectangular waveguide, the easiest way of introducing dispersive couplings is by means of shorted stubs.…”

A Compact Wideband Bandpass Filter Using Novel CSRR Loaded Qmsiw Resonator With High Selectivity

“…Because the field distribution in the SIW cavity is symmetrical, recently, the concept 'half mode substrate integrated waveguide (HMSIW)' [9][10][11][12] and 'quarter-mode substrate integrated waveguide (QMSIW)' [13,14] have attracted much interest in the design of bandpass filter. Compared with SIW, HMSIW has nearly 50% reduction and QMSIW has nearly 75% reduction in size, respectively.…”