Triple Notches Bandstop Microstrip Filter Based on Archimedean Spiral Electromagnetic Bandgap Structure

Abstract

With the development of artificial electromagnetic structures, defective grounding structures (DGS), defective microstrip structures (DMS), and electromagnetic bandgap (EBG) have been widely used in the design of microstrip filters. In this paper, a triple notches ultra wideband bandstop microstrip filter based on Archimedean spiral electromagnetic bandgap structure (ASEBG) structure is proposed. Firstly, the equivalent circuit of ASEBG is analyzed, and L and C values are extracted by using Advanced Design System (ADS). Secondly, the correctness of the lumped parameter model is verified by comparing the High Frequency Structure Simulator (HFSS) simulation results with the measured results. Finally, the influence of ASEBG structure parameters on resonant performance is analyzed by HFSS simulation, and the filter parameters are further optimized. By coupling ASEBG structure to existing double notch microstrip filters, a triple notches ultra wideband bandstop microstrip filter is realized. This method can also be used in the design of other microstrip devices with stopband characteristics. The three bandgap center frequencies of the proposed triple notches ultra wideband bandstop microstrip filter are 3.5, 5.2, and 7.4 GHz, respectively. The corresponding maximum attenuation of the three stopbands is 33.6, 24.8, and 21.7 dB, respectively.

Compact Double Notch Coplanar and Microstrip Bandstop Filters Using Metamaterial—Inspired Open Ring Resonators

“…e and a simpler design than those proposed in [16][17][18][19][20][21][22]. The open split ring reso-SRR) was firstly studied [23,24] and then modified to include interconnected rings Previous works were limited to a pair of rings, but in this paper, we demonstrate each new ring that we introduce, a new resonance appears, therefore creating a tch frequency band.…”

“…Defected ground structures (DGSs) have also been applied to the design of filters [14,15] to introduce additional resonances and to improve their frequency responses. Analogous situations to the design of multi-band BPFs can be described for multi-notch bandstop filters (BSF) [16][17][18][19][20][21][22], which find important applications in the suppression of spurious signals in communication systems. In the case of the BSF, the insertion losses are lower in the passband as compared to their BPF counterparts.…”

“…In this paper, we add new concentric rings to a basic open interconnected split ring resonator (OISRR), to achieve additional notch frequencies, thus resulting in a multi-notch response and a simpler design than those proposed in [16][17][18][19][20][21][22]. The open split ring resonator (OSRR) was firstly studied [23,24] and then modified to include interconnected rings [25,26].…”

“…In [27], an example of a three open interconnected split ring resonator (3OISRR) in microstrip technology is described. This design is modified to implement a multi-notch bandstop filter in coplanar technology, thus showing the ability of this resonator to be applied to different planar technologies unlike the other designs presented in [16][17][18][19][20][21][22]. Moreover, losses omitted in previous works are now taken into account in the proposed equivalent circuit model.…”

Frequency-reconfigurable wideband bandstop filter using varactor-based dual-slotted defected ground structure

“…Bandstop filters (BSFs) [1,2,3,4,5,6] are widely used in microwave and millimeter-wave circuits since they can suppress harmonics, spurious signals and out-of-band noise. In particular, in order to avoid interferences between multiple wireless systems in close proximity, wide-stopband bandpass filters are in high demand [7,8,9].…”