Techniques to improve sharpness and stop band rejection of Defected Ground Structure based low pass filter

Due to the frequency response periodicity of distributed transmission line, microstrip band-pass filter usually produces parasitic pass-band and outputs harmonics away from the center frequency of main pass-band. Based on the study of rectangular ring defected ground structure, a 5-order microstrip LPF(low-pass filter) was designed using the single-pole band-stop and slow-wave characteristics of the rectangular ring DGS(Defected Ground Structure) and SISS(Step-Impedance Shunt Stub) structure. Compared with traditional LPF, this LPF presents the advantages of compact size, low insertion loss, broad stop-band and high steep. It also validates the requirements of miniaturization and high performance for filters.

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A new cross-head defected ground structure (CDGS) for a compact low-pass filter with a wide stop-band

2007 European Microwave Conference ◽

10.1109/eumc.2007.4405324 ◽

2007 ◽

Cited By ~ 5

Author(s):

A. Boutejdar ◽

A. Elsherbini ◽

A. Omar

Keyword(s):

Stop Band ◽

Defected Ground Structure ◽

Ground Structure ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass

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High-Performance Low-Pass Filter Using Stepped Impedance Resonator and Defected Ground Structure

Electronics ◽

10.3390/electronics8040403 ◽

2019 ◽

Vol 8 (4) ◽

pp. 403 ◽

Cited By ~ 3

Author(s):

Jin Zhang ◽

Ruosong Yang ◽

Chen Zhang

Keyword(s):

High Performance ◽

Stop Band ◽

Pass Band ◽

Defected Ground Structure ◽

Ground Structure ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass ◽

Stepped Impedance Resonator ◽

Internal Coupling

A microstrip low-pass filter (LPF) using reformative stepped impedance resonator (SIR) and defected ground structure (DGS) is proposed in this paper. The proposed filter not only possesses the advantage of high frequency selectivity of SIR hairpin LPF with internal coupling, but also possesses the large stop-band (SB) bandwidth by adjusting the number and area of DGS units. The LPF proposed in this paper possesses the properties of miniaturization, wide SB, high selectivity, and low pass-band ripple (PBR) simultaneously. The characteristic parameters of the proposed LPF is that: the pass-band (PB) is 0~2 GHz, the PBR is 0.5 dB, the SB range is from 2.4 GHz to 9 GHz when the attenuation is under 20 dB, and the maximal attenuation could reach 45 dB in the SB. The size of this proposed LPF is 0.13 λ × 0.09 λ ; λ is the corresponding wavelength of the upper PB edge frequency of 2 GHz.

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Design of an Ideal Low Pass Microstrip Line Filter Using the Defected Ground Structure

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.876.133 ◽

2018 ◽

Vol 876 ◽

pp. 133-137

Author(s):

Ping Cheng Chen ◽

Chung Long Pan ◽

J.D. Huang ◽

S.H. Hong

Keyword(s):

Frequency Response ◽

Microstrip Line ◽

Geometric Shape ◽

Center Frequency ◽

Defected Ground Structure ◽

Ground Structure ◽

Pass Filter ◽

Low Pass Filter ◽

Ansoft Hfss ◽

Low Pass

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.

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