Compact Elliptic function Lowpass Filter based on Defected Ground Structure

Rouhi, Reza; Ghobadi, Changiz; Nourinia, Javad; Pirani, Saeid

doi:10.1587/elex.7.434

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…In [3], the feature of easily controlled resonant frequency is achieved by interdigital DGS slots. In [4], a sharp roll‐off LPF is realised by a compact DGS in modified shape. By increasing the number of DGS cells, typically in a periodic pattern, the stopband of LPF can be effectively extended.…”

Section: Introductionmentioning

confidence: 99%

Compact microstrip lowpass filter with ultra‐wide stopband based on dual‐plane structure

Shu

2017

Electron. lett.

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A microstrip lowpass filter (LPF) with ultra‐wide stopband suppression and compact size based on dual‐plane structure is presented. The LPF is composed of high‐impedance resonators loaded by folded patches on the topside plane, combined with hybrid slot and step‐impedance resonators on the ground plane. Multiple transmission zeros are created in the stopband region by different resonators. Thus, an ultra‐wide stopband with 11th‐harmonic suppression is achieved. A demonstration filter with 3 dB cutoff frequency (fc) at 2.45 GHz has been designed, fabricated and measured. Results show that the relative stopband bandwidth is 163.8% with attenuation level of 20 dB. The insertion loss is lower than 0.3 dB and the return loss is better than 17 dB in the passband. The size of the LPF is only 8.90 mm × 8.93 mm, which corresponds to 0.115λg × 0.116λg (λg is the guided wavelength at fc).

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Section: Introductionmentioning

confidence: 99%

Compact microstrip lowpass filter with ultra‐wide stopband based on dual‐plane structure

Shu

2017

Electron. lett.

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“…Defected ground structure (DGS) is similar to the "photonic bandgap (PBG) structure" in the microwave region that prohibits the propagation of certain bands of frequencies [8,9]. This structure is simply applied by etching the ground plane of the microstrip to periodic or non-periodic patterns [10] and has been used by many researchers to increase the output power and efficiency of power amplifiers, improve the isolations between the passbands of the muti-bandpass filters and reduce unwanted harmonics in the mixer applications.…”

Section: Introductionmentioning

confidence: 99%

A tunable dual-band bandpass filter using asymmetrical varactor-loaded HWRs and defected ground structure

Cao

Tang

Wang

et al. 2015

IEICE Electron. Express

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In this paper, a tunable dual-band bandpass filter using asymmetrical varactor-loaded half-wavelength resonators (HWR) and defected ground structure (DGS) is proposed. First, varactors are added at the end of the conventional HWRs to change their resonant frequencies. And to determine the bandwidth of the passbands, the coupling coefficients are calculated to the requirements based on the theoretical analyses. However, the isolation will deteriorate if the passbands are tuned close to each other. Then in order to solve this problem, a pair of circular DGS is introduced at the ground plane of the filter. This structure can prevent electromagnetic energy from propagating at some certain frequency point and if it is designed between the passbands, the isolation will be improved. In our design, the proposed dual-band bandpass filter using varactor-loaded HWRs and DGS is simulated and fabricated. The simulated results and measured results are in good agreement and the proposed filter can be applied in microwave circuits and communication systems.

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“…In [6][7][8][9], LPFs were studied using defect ground structure (DGS) with different specifications and reported as best in terms of performance and compactness, but require relatively larger number of design parameters. In addition, DGS introduces undesired radiation in the passband, and take very long time to understand the details of the physical structure.…”

Section: Introductionmentioning

confidence: 99%

Development and Analysis of Compact Lowpass Filter for UWB Systems

Thirumalaivasan¹,

Nakkeeran²

2012

Advanced Computational Techniques in Electromagnetics

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This paper presents a developed compact lowpass filter which is devised by concatenating 'T' and inverted 'T' open stubs on a microstrip line. They are combined to enhance the bandwidth and also to improve the outband performance. Insertion loss of the developed filter is less than-0.15 dB and the return loss is-30 dB at 2.85 GHz. Stopband performance of the filter is less than-20 dB from 5.4 GHz to 7.8 GHz and provides-3 dB cutoff frequency at 4.5 GHz. The final dimension of the fabricated filter with the above features is only 16.17 mm (length) ×15.76 mm (width). The response of the developed filter has a good agreement with simulation response.

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Compact Elliptic function Lowpass Filter based on Defected Ground Structure

Cited by 5 publications

References 6 publications

Compact microstrip lowpass filter with ultra‐wide stopband based on dual‐plane structure

Compact microstrip lowpass filter with ultra‐wide stopband based on dual‐plane structure

A tunable dual-band bandpass filter using asymmetrical varactor-loaded HWRs and defected ground structure

Development and Analysis of Compact Lowpass Filter for UWB Systems

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