A Compact Lowpass Filter Using Interdigital Line Resonator with Wide Stopband

Sen, Sarbani; Moyra, Tamasi

doi:10.1007/s40998-019-00191-w

Cited by 5 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, the FOM is determined by:

FOM = \frac{RSB \times ξ \times SF}{AF \times NSC}

where, AF stands for architecture factor, for two dimension, it is considered to be equal to “1.” The FOM calculated for the designed LPF is 21 600. The Equations (6)‐(9) defines the features of the proposed LPF. Table depicts the calculated parameters obtained for the presented filter.…”

Section: Experimental Validationmentioning

confidence: 99%

“…Inclusion of DGS with the existing signal plane structure disturbs the current distribution in the signal plane. The total inductance and capacitance due to the DGS structures can be calculated by:

C_{g} = \frac{f_{normalc}}{4 π Z_{0} ((), f_{0}^{2} - f_{c}^{2})},

L_{g} = \frac{1}{4 π^{2} f_{0}^{2} C_{g}},

where, f c is the cut‐off frequency and f 0 is the resonant frequency of a unit DGS cell. Z 0 is the characteristics impedance of the microstrip line that can be calculated as,

Z_{0} = \frac{120 π}{\sqrt ε_{eff} ([], \frac{W}{h} + 1.393 + \frac{2}{3} \ln ((), \frac{W}{h} + 1.444))} ohms,

and the effective dielectric constant

((), ε_{eff}) = \frac{ε_{r} + 1}{2} + \frac{ε_{r} - 1}{2} {[\frac{1}{\sqrt{1 + \frac{12 h}{W}}}]}^{- 1 / 2} .

…”

Section: Equivalent Circuitmentioning

confidence: 99%

“…But only a few could provide good out of band features. Employment of DGS is a novel approach for obtaining wider attenuation band …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Compact low‐cost microstrip lowpass filter with sharp roll‐off and wide attenuation band

Sen

Moyra

2019

Int J RF Microw Comput Aided Eng

Self Cite

View full text Add to dashboard Cite

A compact low-cost lowpass filter (LPF) with sharp roll-off and wide attenuation band using stepped impedance resonator loaded with interdigital fingers and U-shaped resonator is recommended in this article. The proposed LPF has a cut-off frequency of 1.2 GHz with a sharp roll-off 135 dB/GHz and passband insertion loss 0.35 dB. An array of two different shapes of defected ground structures are etched in the ground plane for introducing additional transmission zeroes to enhance the stopband performance. The relative stopband suppression is achieved up to 171% with a suppression factor of 2. The proposed structure is modelled, fabricated, and measured. The measurement results are found to be well-matched with the simulated ones. Eventually, a high figure of merit of 21 600 is achieved. K E Y W O R D S defected ground structures, figure of merit, interdigital lines, lowpass filter, stepped impedance resonator, U-shaped resonator

show abstract

“…Hence, the FOM is determined by:

FOM = \frac{RSB \times ξ \times SF}{AF \times NSC}

Section: Experimental Validationmentioning

confidence: 99%

C_{g} = \frac{f_{normalc}}{4 π Z_{0} ((), f_{0}^{2} - f_{c}^{2})},

L_{g} = \frac{1}{4 π^{2} f_{0}^{2} C_{g}},

where, f c is the cut‐off frequency and f 0 is the resonant frequency of a unit DGS cell. Z 0 is the characteristics impedance of the microstrip line that can be calculated as,

Z_{0} = \frac{120 π}{\sqrt ε_{eff} ([], \frac{W}{h} + 1.393 + \frac{2}{3} \ln ((), \frac{W}{h} + 1.444))} ohms,

and the effective dielectric constant

((), ε_{eff}) = \frac{ε_{r} + 1}{2} + \frac{ε_{r} - 1}{2} {[\frac{1}{\sqrt{1 + \frac{12 h}{W}}}]}^{- 1 / 2} .

…”

Section: Equivalent Circuitmentioning

confidence: 99%

See 1 more Smart Citation

Compact low‐cost microstrip lowpass filter with sharp roll‐off and wide attenuation band

Sen

Moyra

2019

Int J RF Microw Comput Aided Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…One of the techniques used was cascaded technique where resonators are placed in horizontal or vertical topology, but it needs a larger occupied area in addition to larger coupling between resonators is occurred [3,4]. Other techniques can also be used to improve the behaviour of the low pass filter such as stepped-impendence resonators (SIR) [5,6], defected ground-plane structures (DGS) [7][8][9][10], combination of DGS and DMS [11], interdigital line resonator (ILR) [12], and meander-loop resonator [13], meander inductor [14,15], complementary split-ring resonator (CSRR) [16], and combination of SIR and DGS [17].…”

Section: Introductionmentioning

confidence: 99%

Compact tunable U-Hi-Lo low pass filter using quasi C-shaped stubs

Ali¹,

Boutejdar²

2020

J. Inst.

View full text Add to dashboard Cite

This paper introduces a tunable U-form low pass filter composed of Hi-Lo impedance lines with a pair of quasi C-shaped inductors for covering L-band, S-band, and C-band. The quasi- C-shaped inductors are integrated for the purpose of widening pass-band, minimizing the insertion loss, and improving the roll-off rate. The constructed topology has been printed on RO4003 with permittivity of 3.38, loss tangent of 0.0027, and height of 0.813 mm. The filter is distinguished with a compact size of 15.5 × 10.5 mm2, in addition to its low insertion loss of 0.6 dB in L-band and S-band, sharpness factor of 28.8 dB/GHz, and -20 dB stop-band of 4.85 GHz. A pair of lumped capacitors are both embedded in the substrate between the open ends of the C-shaped inductors and the ground plane for achieving a tuning range from 4.7 GHz till 7.56 GHz when using 0.2 pF lumped capacitors. Consequently, it will lead to a reduction in size of 37.5 % when compared to the size of the conventional LPF. Good consistency between simulated and measured characteristics of the fabricated LPF is achieved with/without lumped capacitors.

show abstract