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Design of low-pass filter based on a novel defected ground structure

Journal of Shanghai University(English Edition) 2007年第4期11卷 396-399页

作者：钟小明李国辉 School of Communication and Information Engineering Shanghai University Shanghai 200072 P. R. China

A novel defected ground structure （dgs） for the microstrip line is proposed in this paper. The dgs lattice has more defect parameters so that it can provide better performance than the conventional dumbbell-shaped dgs. Selectivity is improved by 97.2% with a sharpness factor of 24.6%. The method is applied to the design of a low-pass filter to confirm validity of the proposed dgs.

关键词： defected ground structure （dgs） low-pass filter bandgap sharpness factor selectivity

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宽阻带小型化低通滤波器的设计(英文)

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Journal of Shanghai University(English Edition) 2008年第6期12卷 495-497页

作者：杨雪霞薛玉杰 School of Communication and Information Engineering Shanghai University

This paper presents a novel low-pass filter （LPF） with sharp rejection, wide stopband and compact size, which are realized by the defected ground structure （dgs） and the defected microstrip structure （DMS）. The equivalent circuit model is proposed and the circuit parameters are extracted by the circuit simulation software. The parameters measured are 3 dB cutoff frequency fc of 5.2 GHz, the insertion loss less than 0.5 dB from DC to 4.0 GHz and S21 less than -20 dB within the wide stopband from 6 GHz to 16 GHz. The results of the circuit optimization agree well with those of the full wave simulation and the measured ones, which validate the effectiveness of the equivalent circuit model. The size of the proposed LPF is decreased compared with normal LPF. This LPF can be applied in rectennas to eliminate high order harmonics.

关键词： low-pass filter （LPF） defected ground structure （dgs） defected microstrip structure （DMS） equivalent circuit

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A Compact Low Pass Filter with Good Stopband Performance Using an Open-loop-arms defected ground structure Unit

A Compact Low Pass Filter with Good Stopband Performance Usi...

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2009 3rd IEEE International Symposium on Microwave,Antenna,Propagation and EMC Technologies for Wireless Communications

作者： MOU Jin-chao YU Wei-hua Sun Hou-jun Lv Xin School of Information and Electronics Beijing Institute of Technology Beijing China

A novel compact wideband high-rejection low- pass filter （LPF） using open-loop-arms defected ground structure （dgs） is presented. The performance of the proposed open-loop-arms dgs is analyzed, which shows deeper rejection and larger Q-factor. An equivalent circuit model has been given. Some dimensions of the dgs are studied. In order to show the validity of the proposed dgs, an optimized LPF is designed, the measured result of which shows a good agreement with the simulated result.

关键词： defected ground structure （dgs） Low Pass Filter Open-loop-arms dgs

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Ultra-Wideband Bandpass Filter With Dual Notched Bands Using Hybrid Microstrip/CPW structure

Ultra-Wideband Bandpass Filter With Dual Notched Bands Using...

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2011 3rd International Conference on Computer Research and Development(ICCRD 2011)

作者： Cong-Liu and Jun-Xu School of Physical Electronics UESTC Chengdu P.R.China

A novel ultra-wideband （UWB） bandpass filter （BPF） with dual notched bands using the hybrid microstrip and coplanar waveguide （CPW） structure is proposed,to prevent interference problems between the UWB radio system and existing radio systems.A multiple-mode resonator on a CPW is formed to allocate its first three resonant modes around the lower-end,centre and upper-end of the 3.1 to 10.6 GHz UWB passband.Its two sides are fed by two microstrip-to-CPW transitions with enhanced frequency-dispersive coupling degree.The dual narrow notched bands are introduced by embedding a open stub in the CPW line and etching two Ushaped slots on the ground plane to form defected ground structures （dgss） in each side of the microstrip structure.Then,dual-band rejected filtering properties in the C-band （3.7-4.2 GHz） and WLAN （5.15-5.825 GHz） are achieved.The UWB bandpass filter with notched bands has been carried out by designs and related simulations to demonstrate the notchband-included and upper-stopband-improved performances.

关键词： bandpass filter （BPF） ultra-wideband （UWB） hybrid microstrip/coplanar waveguide notched band defected ground structure （dgs）

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