Compact Lowpass Filter With High Selectivity Using G-Shaped Defected Microstrip Structure

Cao, Hailin; Guan, Wei; He, Sijia; Yang, Lisheng

doi:10.2528/pierl12051412

Cited by 12 publications

(12 citation statements)

References 15 publications

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“…An integrated comb-line BPF with T-shaped DMS at the external input and output coupling transformers has been studied in [12], which has a FBW of 2%. In [13], a lowpass filter (LPF) using G-shaped DMS has also been described and discussed. In [14][15][16], several bandstop filters based on the stop-band feature of DMS have also been investigated and implemented.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the various new filters based on defected microstrip structure (DMS) have been broadly studied. [8][9][10][11][12][13][14][15][16] In [8], a novel bandstop filter comprised of two cascaded M-shape slots etched on the 50-Ω microstrip transmission line has been investigated. In [9,10], two DMS filters with single-and multi-bandgap characteristics have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Wideband dual-mode bandpass filter using a modified right-triangular patch resonator overlapped with input/output DMS

Chen

Ke-song

et al. 2013

Journal of Electromagnetic Waves and Applications

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A novel and compact dual-mode wideband bandpass filter (BPF) with multiple transmission zeros is designed, fabricated, and measured in this paper. This filter consists of a modified right-triangle patch resonator with two orthogonal narrow-strip stubs and improved input/output defected microstrip structure (DMS). The designed resonator and DMS show dual-mode and dual-bandgap characteristics, respectively. The equivalent circuit models are described and their element values are also extracted by the full-wave EM simulator. The presented BPF is constructed by cascading the stub of patch resonator with the input/output DMS and overlapping partly with each other between the stub of resonator and middle conductor strip of input/output DMS. The EM simulated result has been confirmed by an experimental one and they have shown good agreement with each other. The measured result exhibits wide passband and low insertion loss characteristics for the proposed filter. IntroductionWith the rapid development of modern mobile communication systems, the miniaturized, low-cost, and wideband filters with lower insertion loss and higher frequency selectivity have been increasing demands in many wireless applications. Among these filters, dual-mode resonator filters have been widely used for their compact size.[1-7] The microstrip dual-mode triangular patch resonators and their applications for dual-mode filters with less than 10% 3-dB fractional bandwidth (FBW) have been investigated in [1]. A dual-mode bandpass filter (BPF) with 3-dB FBW of 16% using a pair of spur-line resonators has been reported in [2]. A single-slotted circular patch resonator has been used to design a dual-mode dual-band BPF, which has a 3-dB FBW of less than 10% in any passband.[3] A BPF based on E-shaped dual-mode resonator has been designed and implemented, which has a FBW of 2%.[4] In [5], a dual-mode half wavelength resonator filter with centrally loaded open stub and quasi-L-shaped feed-lines has been reported, which has a narrow FBW of 4.7% at the central frequency. A fourth-order dual-mode microstrip BPF with a FBW of 11% has been developed in [6]. In general, the insertion losses of above-mentioned filters are greater than 1.0 dB within their passbands. A coupled-line BPF using dual-mode half-wavelength SIR centrally loaded with shorted stub has been studied in [7], which has a suppression characteristic for high-order harmonics, however, the dual-mode filter still has a narrow bandwidth and high insertion

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wideband dual-mode bandpass filter using a modified right-triangular patch resonator overlapped with input/output DMS

Chen

Ke-song

et al. 2013

Journal of Electromagnetic Waves and Applications

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“…A compact low-pass filter using semi-circular stepped impedance resonators and open stubs is proposed in [8]. Another design technique of a low-pass filter to get wide stopband is proposed in [9] by employing a G-shaped DMS but at the cost of large physical size. In recent years, defective ground structures (DGS) have been widely used for LPF designs [10,11].…”

Section: Introductionmentioning

confidence: 99%

Design and Manufacturing of a Novel Compact 2.4 GHZ LPF Using a DGS-DMS Combination and Quasi Octagonal Resonators for Radar and GPS Applications

Boutejdar¹,

Challal²,

Das³

et al. 2019

PIER C

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In this paper, a new compact microstrip low-pass filter (LPF) with ultra-wide stopband characteristics is presented. The combinations of DGS-DMS along with quasi octagonal resonators are employed in the design of the proposed filter to achieve compact size and ultra-wide stopband suppression level. The proposed filter has been designed, simulated, optimized and tested. The design procedure is validated using the commercial full-wave EM MoM simulator Microwave Office. Simulated as well as measured results of low-pass filter exhibit sharp roll-off (ξ) of 19 dB/GHz and creating transmission zero at around 7.8 GHz with attenuation level −54 dB. The measurement results show good agreement with the simulations. The cutoff frequency of the proposed low-pass filter is 2.4 GHz with the insertion loss less than 0.3 dB. The ultra wide stopband with over 20 dB attenuation extended from 3.42 GHz to 12 GHz. The spurious passband suppression up to six harmonics (5f c) is achieved for the proposed design. The addition of two parasitics DGS elements in the ground plane leads to suppression of the undesired harmonics und thus to improve the stopband. The size of the whole structure is less as (0.44λ g × 0.26λ g) with λ g = 68 mm. The proposed filter is useful for microwave L band, GPS system, and RADAR applications.

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“…[1] In this paper, a novel G-shaped defect microstrip structure is presented. Compared with the conventional DMS, the proposed G-Shaped DMS exhibit lower resonant frequency and wider stopband a low pass filter with 3dB cutoff frequency at 3.17GHz using four pair of parallel Cascade G-Shaped DMS unit is designed and fabricated [2].…”

Section: Introductionmentioning

confidence: 99%

Design of Microstrip Low Pass Filter for L-Band Application

Solanki¹,

Sharma²,

Gupta³

2014

IJEEE

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Wireless communication is need of world. In this era life cannot imagine without it. In this paper it has been designed a microstrip low pass filter for L-band Application. Microstrip Filter is designed from the methods of Step impedance low pass prototype filter, basic property of microstrip filter like simulated design, return loss, amplitude frequency graph and smith chart discussed. Finally it is shown that -3dB return loss is shown at the frequency of 1.584GHz and this frequency come in the Lband so this filters showing a very sharp cutoff and used for different application of L-band (1-2GHz). 

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Compact Lowpass Filter With High Selectivity Using G-Shaped Defected Microstrip Structure

Cited by 12 publications

References 15 publications

Wideband dual-mode bandpass filter using a modified right-triangular patch resonator overlapped with input/output DMS

Wideband dual-mode bandpass filter using a modified right-triangular patch resonator overlapped with input/output DMS

Design and Manufacturing of a Novel Compact 2.4 GHZ LPF Using a DGS-DMS Combination and Quasi Octagonal Resonators for Radar and GPS Applications

Design of Microstrip Low Pass Filter for L-Band Application

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