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Proceedings ArticleDOI

Wide bandstop filter using Chebyshev modulated Dumbbelled DGS

02 Apr 2015-pp 0819-0822
TL;DR: The novel technique of developing Chebyshev Dumbbell DGS low pass filters (LPFs) with compensated microstrip line has better rejection bandwidth at the X-band frequency.
Abstract: The novel technique of developing Chebyshev Dumbbell DGS low pass filters (LPFs) is presented in this paper. The ground plane of a standard 50-ohm transmission line is perturbed by Dumbbell called defected ground structure (DGS) to generate ultra-rejection band at X-Band that is beneficial to higher order harmonic suppression. A comparison of Meander shaped, circular complementary split ring resonator (CSRR) and Dumbbell DGS has been evaluated. An improved Chebyshev Dumbbell DGS LPF with compensated microstrip line has better rejection bandwidth at the X-band frequency.
Citations
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors proposed a compact wideband band-stop filter using complementary split ring resonators (CSRRs) as the fundamental element, and the relation between the geometry and resonances of the CSRR were studied analytically along with their field distribution to determine the factors governing coupling between the rings of the SRR.
Abstract: The objective of this work is to achieve a compact wideband band-stop filter using complementary split ring resonators (CSRR) as the fundamental element. The relation between the geometry and resonances of the CSRR were studied analytically along with their field distribution to determine the factors governing coupling between the rings of the CSRR. The effects of the inner-outer ring orientation on resonances of the CSRR has been studied and the resulting properties have been used to design the proposed compact wideband band-stop filter prototype operating with a center frequency of 2.5 GHz and a bandwidth of 1 GHz. The area of the proposed filter is 0.078 λg2 with a fractional bandwidth of 39.76%. This structure has following advantages: more compact, wide bandwidth and occupies less area. The fabricated prototype was tested and the results were promising representing this works potential.

7 citations

References
More filters
Journal ArticleDOI
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

Journal ArticleDOI
TL;DR: In this article, a new one-dimensional defected ground unit lattice is proposed to improve the effective inductance of the cutoff and stopband in order to control the cutoff frequency characteristics.
Abstract: A new one-dimensional (1-D) defected ground unit lattice is proposed in order to improve the effective inductance. Increasing the effective inductance makes it easy to control the cutoff frequency characteristics. The proposed periodic defected ground structure (DGS) provides the excellent cutoff and stopband characteristics. In order to show the improved the effective inductance, three DGS circuits were fabricated with identical periodic and different dimensions. Measurements on the fabricated DGS circuits show that the cutoff and stopband center frequency characteristics depend on the physical dimension of the proposed DGS unit lattice,.

429 citations

01 Jan 2000
TL;DR: In this paper, a 1-dimensional defected ground unit lattice is proposed to improve the effective inductance of the cutoff and center frequency characteristics of the DGS unit lattices.
Abstract: A new one-dimensional (1-D) defected ground unit lattice is proposed in order to improve the effective inductance. In- creasing the effective inductance makes it easy to control the cutoff frequency characteristics. The proposed periodic defected ground structure (DGS) provides the excellent cutoff and stopband char- acteristics. In order to show the improved the effective inductance, three DGS circuits were fabricated with identical periodic and dif- ferent dimensions. Measurements on the fabricated DGS circuits show that the cutoff and stopband center frequency characteris- tics depend on the physical dimension of the proposed DGS unit lattice.

423 citations

Proceedings ArticleDOI
12 Jun 2005
TL;DR: In this paper, an improved defected ground structure (DGS) with compensated microstrip line is investigated for low-pass filter (LPF) applications, and a 3-pole LPF, using 3 DGS units cascaded, is optimally designed and implemented; measurements show good consistency with calculations.
Abstract: An improved defected ground structure (DGS) with compensated microstrip line is investigated for low-pass filter (LPF) applications. With this structure, the basic resonant element exhibits the elliptic-function low-pass responses. The use of introduced resonant elements allows sharp cutoff frequency response and high harmonic suppressions together with small size to be obtained with less number of periodic structures. An equivalent lumped L-C circuit model is presented and its corresponding L-C parameters are also extracted by using parametric relationships. Based on the equivalent circuit model, a 3-pole LPF, using 3 DGS units cascaded, is optimally designed and implemented; measurements show good consistency with calculations.

37 citations


"Wide bandstop filter using Chebyshe..." refers background in this paper

  • ...The value of micros trip line impedance (lumped inductance) gets increased when width of the microstrip becomes narrower [4]....

    [...]

Journal ArticleDOI
TL;DR: Performance of seven types of simple and complex defected ground structures (DGS) slot to realize the quasi-lumped inductance are better than the reported results of the 5-pole DGS based LPF in literature.
Abstract: We present characteristics of seven types of simple and complex defected ground structures (DGS) slot to realize the quasi-lumped inductance. A simple DGS follows the Butterworth type response; whereas a complex DGS has quasi-elliptic response. The response of DGS has strong influence on the performance of a 5-pole Chebyshev type low-pass filter (LPF). We present a systematic design process to realize the LPF using these DGS slots. The 5-pole open square (OS) DGS based LPF of cut-off frequency 2.5 GHz provides best measured performances-transition region bandwidth 0.53 GHz, 20 dB rejection band-width 14.7 GHz, insertion loss 1.29 dB. Theses performances are better than the reported results of the 5-pole DGS based LPF in literature.

32 citations