Quintuple-Mode Wideband Substrate Integrated Waveguide Filter With Elliptic Dielectric Loading

Abstract

This paper presents a novel quintuple-mode wideband filter based on a circular Substrate Integrated Waveguide (SIW) cavity. To implement this filter, a pair of two metallic perturbation vias loaded around the diameter resonator line is used. An Elliptic Dielectric Resonator (EDR) was introduced in the middle of the cavity to shift certain resonant modes and restrain the higher-order modes. The optimal dimensions and dielectric permittivity of the EDR are investigated. A single SIW resonator filter has been designed, manufactured, and measured as an experimental example to verify the proposed design. Simulation and measurement results agree with 51.7% of fractional bandwidth at 10.1 GHz central frequency, with one transmission zero (TZ) at the lower frequency side and four TZs at the upper side.

Multi-Mode Substrate Integrated Waveguide Wideband Filter Design With Wide Stopband Rejection Using Complementary Split Ring Resonators and Defected Ground Structures

“…However, their narrow passband prevents their use in the modern communication system as 5G. To provide a wide passband, several high order multi-mode resonators have been proposed [5][6][7][8]. In [5], a wideband SIW filter with compact size using a U-shape slot on the metallic plate of a double SIW cavity to produce five resonant modes is investigated.…”

“…On the other hand, the filter was implemented on a multi-layer benzo-cyclo-butene (BCB), which further complicated the circuit. To expand the filtering bandwidth, a compact passband filter on a single circular SIW resonator was proposed in [7], by using an elliptical dielectric resonator (EDR). This filter offered a fractional bandwidth up to 51.7%.…”

“…This filter offered a fractional bandwidth up to 51.7%. In [8], the proposed filter provided five reflections and two transmission zeros at the upper frequency side with fractional bandwidth up to 60%.…”

“…Most of the higher-order single-cavity filters lack a wide stopband rejection [6][7][8]. It is well known that defected ground structures (DGS) have a low pass characteristic [9].…”