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Proceedings ArticleDOI

X-band microstrip pass-band filter using non-uniform DGS structure

10 Sep 2015-pp 1-7
TL;DR: In this article, a modified defected ground structure (DGS) with compensated microstrip line is investigated for band pass filter (BPF) for uplink frequency at X-band.
Abstract: A X-Band microstrip filter for the reduction of size, to improve the rejection in band using modified defected ground structure (DGS) is proposed. Here different types of uniform and non-uniform DGS and its equivalent lumped L-C circuit model are presented for the parametric relationship and the comparison of pass-band in-between the rejection bands. Then an improved defected ground structure (DGS) with compensated microstrip line is investigated for band pass filter (BPF) for the uplink frequency at X-band.
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

Journal ArticleDOI
TL;DR: In this article, complementary split ring resonators are used to design a compact, low insertion loss (IL), low pass filter with sharp cut-off, and a prototype filter implementing area is 0.23 lambdagtimes0.09 lambda g, Lambdag being the guided wavelength at 3-dB cutoff frequency (fc) 1.887GHz.
Abstract: Complementary split ring resonators are used to design compact, low insertion loss (IL), low pass filter with sharp cut-off. A prototype filter implementing area is 0.23 lambdagtimes0.09lambda g, lambdag being the guided wavelength at 3-dB cut-off frequency (fc) 1.887GHz. Maximum IL is within 0.5dB up to 1.717GHz and 20-dB stopband extends up to 3.4fc

88 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


"X-band microstrip pass-band filter ..." refers background in this paper

  • ...Recently, the defected ground structure (DGS) for microstrip line has become more interesting area for research in microwave circuits [1]....

    [...]

Journal ArticleDOI
TL;DR: In this article, a modified defected ground structure (DGS) is proposed to reduce the size and improve the rejection in the stop-band of a low-pass filter.
Abstract: A new technique to reduce the size, improve the rejection in the stop-band of a low-pass filter using modified defected ground structure (DGS) is proposed. An equivalent circuit model is used to study the DGS characteristics. The parameters are extracted by using a simple circuit analysis method. Several comparisons between the EM-simulations and the circuit simulations of the new structure are demonstrated to show the validity of the proposed equivalent circuit model. We demonstrated that the filter can provide a sharp transition domain and a wide rejection in stop-band. To further verify the new technique, a filter employing the new deformed DGS is fabricated and measured. The agreement between the simulation and the measured results confirms the effectiveness of the proposed concept. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1107–1111, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23273

12 citations