Design of a SIR bandpass filter with spurious passband suppression using defected ground structure and Spurline

Meng, Lingkuan; Long, Ren; Jingsong, Huang

doi:10.1109/imws2.2012.6338188

Cited by 4 publications

(2 citation statements)

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“…It offers excellent band gap characteristics but suffers from the limitation of narrow stopband. Various types of DGS structures are also proposed for obtaining the suppressed out‐of‐band response . The available techniques do not fulfil the stringent requirements of a filter for wireless communication applications, such as wide stop‐ and pass‐bands along with compact size and good selectivity simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…But in conventional IBPF, an unwanted frequency band at around three times the midband frequency is obtained , which is not desired for receiver circuitry of a wireless communication system, and hence, it should be suppressed for obtaining wide stopband. For suppressing the unwanted spurious response, a slit configuration in the filter geometry called spurline is devised and reported in the literature . It offers excellent band gap characteristics but suffers from the limitation of narrow stopband.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on compact modified wideband interdigital bandpass filter with wide stopband using spurlines and defected ground structures

Sahu

Tripathi

Meshram

et al. 2016

Micro & Optical Tech Letters

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In this paper, a compact modified microstrip interdigital bandpass filter (IBPF) having two pairs of spurlines and a pair of defected ground structures (DGS) containing stepped impedance resonators (SIRs) is described for L–Band receiver applications. A combination of spurlines and SIR‐shaped DGS is used to obtain the proposed compact IBPF with wide stop‐ and pass‐bands. The reduction in size and wide stopband characteristic of the filter result from band notched characteristic of spurline, and harmonic suppression along with miniaturization characteristic of DGS. The equivalent circuit parameters of the spurlines and DGS are also extracted and their values are computed. The proposed compact filter is of size 0.24λg × 0.34λg (0.107λ0 × 0.075λ0), where λg=λ0/εr, λ0 is the free space wavelength at the centre frequency (f0) of 1.47 GHz and εr (=10.2) is the dielectric constant of the substrate. The simulated and measured 3‐dB fractional bandwidths of the proposed filter are 80% (over the frequency range 0.89 −2.05 GHz) and 79% (over the frequency range 0.87–2.01 GHz) respectively. The proposed BPF has stopband attenuation better than 17 dB upto a frequency of approximately six times the centre frequency of the desired passband. For the validation of the simulated results, the prototype of the proposed filter was fabricated and its parameters like S–parameters, group delay and phase responses were measured. The experimental results for the proposed BPF are nearly in agreement with the respective simulation results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2634–2639, 2016

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%