Article

A novel combinatorial non-periodic defected ground structure

June 2007

Authors:

This paper presented a novel combinatorial non-periodic defected ground structure (CNPDGS) and its application in the low pass filter. The presented CNPDGS can provide the bandgap characteristic with dual-stopband. The influences of lattice dimensions on the characteristic of frequency were studied. The low pass filter formed by microstrip and proposed CNPDGS was designed. The simulated results prove that the designed low pass filter can effectively reject the higher harmonics.

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Novel butterfly shape defected ground structure for microstripline

Article

Dec 2004

A novel butterfly shape defected ground structure for microstrip line was proposed. Its band-gap characteristics and slow-wave characteristics were discussed. Including the transmission loss, equivalent circuit modeling for the proposed microstrip line was built and its parameters were extracted. The effects of DGS dimensions on stop-band characteristics were presented. Furthermore, a compact DGS low-pass filter was designed and measured. The validity of the DGS filter is verified by the agreement between simulated and measured results.

Article

A compact bandpass filter by use of defected ground structures

September 2011 · IEICE Electronics Express

In this paper, a novel technique to design bandpass filter, is presented. Defected Ground Structures (DGS) are used as the main block of the filter. Two filters with different center frequencies and fractional bandwidths with two different structures have been simulated designed and compared. By changing the dimensions of the structure, filter response can be easily controlled. Several useful ... [Show full abstract] graphs have been presented to design other filters. Three sections of DGS have been cascaded which improve the response of the filter.

Article

Design of a novel V-band coplanar waveguide low-pass filter based on defected ground structures

May 2011

This paper presents a novel V-band coplanar waveguide low pass filter based on defected ground structure (DGS) cells. The proposed DGS cell provides low-pass characteristic whose cutoff frequency could be changed by tuning its dimensions. To realize a low pass filter with excellent rejection in the stop-band, several DGS cells with different sizes are cascaded together. Gallium arsenide is ... [Show full abstract] adopted to be the substrate of the low-pass filter with the cutoff frequency located in the V band. By optimization, a low-pass filter with the cutoff frequency of 60 GHz is designed, whose insertion loss in the pass band is less than 0.2 dB and the rejection in the stop-band is better than 25 dB from 65 GHz to 100 GHz.

Article

A Design of Spurious-Reduced CPW Low-Pass Filter Based on Defected Ground Structure

January 2006 · The Journal of Korean Institute of Electromagnetic Engineering and Science

In this paper, a CPW lowpass filter with the spurious-reduced characteristic is designed by using DGS(Defected Ground Structures). By cascading two lowpass filters with different harmonic characteristics the spurious is reduced below - 15 dB. Additionally by combining a dumbbell shaped DGS to the filter we achieved a satisfactory spurious level of less than -25 dB to above three times cutoff ... [Show full abstract] frequency without any repeated passband. The fabricated LPF shows a compact size of , a cutoff frequency of 6 GHz, and a sharp skirt response of 7-order with two notch frequencies. The measured frequency responses agree well with simulated ones.

Article

Study of a novel combinatorial nonperiodic defected ground structure

February 2005

A novel combinatorial nonperiodic defected ground structure (CNPDGS) with daul-stopband is proposed. The microwave circuits with the CNPDGS structure are simulated by finite-difference time-domain (FDTD) method. The influences of lattice dimensions on the characteristic of frequency are studied. The filters with daul-stopband formed by microstrip and proposed CNPDGS are designed and manufactured. ... [Show full abstract] The curves of the simulated results and measured results are presented. The measured results are in agreement well with the simulated results. For the filter, the pass-band between the two stopbands is tunable. The location and the bandwidth of the pass-band are varied with the sizes of lattice dimension. The distance between two stop-bands can be changed from 3.5 GHz to 12 GHz. The filter with the expected pass-band can be obtained by the selection of the lattice dimension. The filter with proposed CNPDGS can effectively reject the lower frequencies and higher frequencies in signal.

Conference Paper

A novel ultra-wide stopband microstrip low-pass filter for rejecting high order harmonics and spurio...

December 2012

In this paper, an ultra-wide stopband microstrip low-pass filter (LPF) to reject higher harmonics and spurious response for wideband microwave applications is proposed. It is based on quasi-triangular (QT) defected ground structure (DGS) resonators and open stubs. An equivalent circuit model is also presented. The introduced LPF has small size, a low insertion loss and a return loss less than −20 ... [Show full abstract] dB. In addition, a round −20 dB suppression level ranging from 4 GHz to more than 20 GHz is achieved. The simulated results obtained by circuit model and full-wave EM show good agreement with the measured ones.

Article

Design of the Compact Microstrip Bandpass Filter by using DGS Resonator

January 2005 · The Journal of Korean Institute of Communications and Information Sciences

In this paper, we have proposed a novel DGS(Defected Ground Structure) resonator and has designed the band -pass filter using the proposed stub-I type DGS resonator. This structure has strong advantages that can vary the retune loss at the passband freely and also can easily tune the attenuation pole frequency at the stopband. The bandpass filter can be made more smaller than the existing filters ... [Show full abstract] and be used to find the various applications for eliminating the harmonics and spurious mode at IMT-2000 band.