Design of microstrip narrowband bandpass filter using a star shaped defected ground structure
01 Oct 2015-pp 92-94
TL;DR: This paper introduces a bandpass filter using a new star shaped defected ground structure (DGS) which consists of two coupled star shaped slots with small opening etched on the ground plane and is fed by `T' shaped microstrip feed lines on the top layer of the microstrip.
Abstract: This paper introduces a bandpass filter using a new star shaped defected ground structure (DGS) It consists of two coupled star shaped slots with small opening etched on the ground plane and is fed by ‘T’ shaped microstrip feed lines on the top layer of the microstrip Due to the arrangement of etched slots and also because of capacitive gap between T shaped feed lines which acts as a J inverter, band reject response is converted into a bandpass response T shaped feed lines provide necessary coupling to achieve bandpass response A prototype filter simulated shows, an insertion loss of 11 dB, return loss of 22 dB and having narrow fractional bandwidth (FBW) of 1255% centered at 242 GHz With low insertion loss, good return loss, narrow bandwidth, and low cost, the proposed filter is an attractive choice for modern wireless communication systems such as WLAN and Bluetooth applications
Citations
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01 Apr 2019
TL;DR: Design and practical realization of radio frequency (RF) bandpass filter (BPF) with center frequency 756MHz and -3dB bandwidth of 15MHz is presented and transmission and reflection parameters can be set properly to acquire desired specifications.
Abstract: In this paper, design and practical realization of radio frequency (RF) bandpass filter (BPF) with center frequency 756MHz and -3dB bandwidth of 15MHz is presented. BPF is realized by discrete LC components. Each LC component used in BPF circuit has been carefully analyzed and determined by appropriate equivalent circuits, which were created in MATLAB. Subsequently, BPF circuit has been created using these individual circuits. According to obtained BPF circuit in MATLAB, the transmission and reflection parameters can be set properly to acquire desired specifications. Scattering parameter measurements of practically realized BPF were carried out for verification of proposed method.
1 citations
Cites background from "Design of microstrip narrowband ban..."
...Nowadays, microwave filters are realized by various technologies [1-5] with respect to requirements of specific communication systems....
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16 Apr 2019
TL;DR: The design of BPF is based on mathematical modelling of lumped element circuit and its transformation to planar components determined by transmission line theory and the correctness of proposed technique is demonstrated on practically realized microstrip BPF.
Abstract: In this paper, a development of novel microstrip bandpass filter (BPF) structure is presented using simple lumped element circuit composed from four capacitors and inductance transformer. The design of BPF is based on mathematical modelling of mentioned lumped element circuit and its transformation to planar components determined by transmission line theory. The correctness of proposed technique is demonstrated on practically realized microstrip BPF with center frequency set to 820MHz and −3dB bandwidth of 50MHz.
1 citations
Cites background from "Design of microstrip narrowband ban..."
...Various conditions according to mentioned parameters are achievable with various technologies [2-6]....
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TL;DR: In this article, a low pass microstrip line filter with defected ground structure (DGS) has been designed and simulated using simulated soft (Ansoft HFSS V.6.0).
Abstract: A design and simulation for low pass microstrip line filter with defected ground structure has been researched, the main purpose is with the simplest method to design an ideal low pass filter. In this paper, simulated soft (Ansoft HFSS V.6.0) used to be simulated the frequency response under different geometric shape of DGS. The results show good performance of a low pass filter with DGS. Final, a low pass filter with DGS design and fabricated, The properties are shown as flow: center-frequency: 7.28G, S21:-47dB, cut-off frequency: 5.88GHz.
Cites background from "Design of microstrip narrowband ban..."
...After that, a lot of researches about DGS were provided, such as Semicircle DGS [2, 3], slotted ground structure [4, 5], the mvel defected ground structure [6], star shaped structure [7]....
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References
More filters
TL;DR: In this article, a new defected ground unit structure (DGS) for the microstrip line is proposed, which can provide the bandgap characteristic in some frequency bands with only one or more unit lattices.
Abstract: A new defected ground structure (DGS) for the microstrip line is proposed in this paper. The proposed DGS unit structure can provide the bandgap characteristic in some frequency bands with only one or more unit lattices. The equivalent circuit for the proposed defected ground unit structure is derived by means of three-dimensional field analysis methods. The equivalent-circuit parameters are extracted by using a simple circuit analysis method. By employing the extracted parameters and circuit analysis theory, the bandgap effect for the provided defected ground unit structure can be explained. By using the derived and extracted equivalent circuit and parameters, the low-pass filters are designed and implemented. The experimental results show excellent agreement with theoretical results and the validity of the modeling method for the proposed defected ground unit structure.
1,269 citations
"Design of microstrip narrowband ban..." refers background in this paper
...DGS is realized by etching simple or complex slots on the ground plane, thereby changing the shielded current distribution [2] of the ground plane....
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...DGS [2] inspired by photonic bandgap (PBG) or electromagnetic bandgap (EBG) materials is one such promising candidate to realize high performance filters....
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TL;DR: In this paper, the effect of the geometrical shapes of a defected groundplane structure (DGS) slot on performance of the Hi-Lo microstrip low-pass filter (LPF) was examined.
Abstract: This paper examines the effect of the geometrical shapes of a defected ground-plane structure (DGS) slot on performance of the Hi-Lo microstrip low-pass filter (LPF). A three-pole LPF based on an arrowhead DGS slot has 67% less length as compared to a conventional three-pole LPF. It has insertion loss of 0.5 dB and 15-dB rejection in the stopband up to three times the cutoff frequency.
292 citations
TL;DR: In this paper, the etched slots in the ground plane of the parallel coupled lines can significantly increase the coupling, and this technique has been extended to realize ultra-wideband BPFs having 3dB fractional bandwidth greater than 100% and low insertion loss in the passband.
Abstract: Designing wideband bandpass filters (BPF) with parallel-coupled microstrip lines requires tight coupling resulting in close separation between the lines and difficulty of fabrication. Here, it is shown that the etched slots in the ground plane of the parallel coupled lines can significantly increase the coupling. This technique has been extended to realize ultra-wideband BPFs having 3-dB fractional bandwidth greater than 100% and low insertion loss in the passband
52 citations
"Design of microstrip narrowband ban..." refers methods in this paper
...T-shaped microstrip feed lines [5] are used to get sufficient coupling....
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TL;DR: In this article, a detailed review of microstrip filters with defected ground structure (DGS) is presented, which is inspired by photonic/electromagnetic bandgap structures (EBG/PBG) and metamaterials that are employed in microwave components to achieve a variety of performance enhancements.
Abstract: This paper presents a close but a beginner's perspective and a comprehensive review of microstrip filters with defected ground structure (DGS). The concept of DGS is inspired by photonic/electromagnetic bandgap structures (EBG/PBG) and metamaterials that are employed in microwave components to achieve a variety of performance enhancement features. Modeling of DGS and metamaterials as an L-C equivalent lumped circuit is much simpler in comparison with complex EBGs/PBGs. In this review, we have given a detailed account of the microstrip filters using DGS.
46 citations