Abstract
A novel method to design a wideband substrate integrated waveguide (SIW) bandpass filter (BPF) with compact size, wide stopband and high selectivity is presented. In this method some unique electromagnetic band-gap (EBG) cells are periodically etched on the top layer of SIW to realize a wide passband propagating below the equivalent waveguide cutoff frequency. By changing the configuration of EBG cells, undesired harmonics in upper stopband can be suppressed and a wideband BPF with wide stopband can be obtained. By symmetrically loading two complementary split ring resonators (CSRRs) on the tapered gradient lines of the input/output ports, a transmission zero near the passband can be introduced, and it makes the frequency selectivity of upper sideband improve significantly. As a verification, a wideband SIW BPF with a 3.02 GHz absolute bandwidth (ABW) and a 64.7% fractional bandwidth (FBW) centered at 4.67 GHz is designed, simulated, manufactured, and measured. The results of the experiment and simulation are in good agreement.
Highlights
Filters play a very important role in many microwave and radio frequency (RF) applications.Burgeoning applications such as wireless communication systems continue to challenge microwave/RF filters with even more stringent requirements [1]
This paper presents a novel method to design an excellent wideband bandpass filter (BPF) by combining substrate integrated waveguide (SIW)
Lower and upper cutoff frequency are determined by SIW and electromagnetic band-gap (EBG) cells, respectively
Summary
Filters play a very important role in many microwave and radio frequency (RF) applications. Up until now the design of the wideband BPFs with compact size, high selectivity, low cost, wide stopband and high power capacity is still a challenging task. The aforementioned improvement is substantial, the RHMSIW BPF has narrow stopband region and low selectivity. The aforementioned improvement is substantial, the RHMSIW BPF has narrow [6], a SIW BPF with wide stopband is proposed by utilizing the defected ground structure (DGS). In [6], a SIW BPF with wide stopband is proposed by utilizing the wideband and high skirt selectivity features can be achieved. This paper presents a novel method to design an excellent wideband BPF by combining SIW with some advanced technologies. Compared with other traditional structures, the proposed filter can work in a lower frequency with a more compact size.
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