Elliptic-function lowpass filter with sharp cutoff frequency using slit-loaded tapered compact microstrip resonator cell

A compact lowpass filter using two single-sided compact microstrip resonator cells （CMRCs）with low insertion loss and broad bandwidth is presented. The cutoff frequency is about 1.4 GHz, the insertion loss is less than 0.6 dB and the 20dB bandwidth is up to the range from 2.1 GHz to 9.8 GHz by means of introducing four transmission zeros through two CMRCs. In addition, the simulated results demonstrate that the proposed filter is characterized by a compact size, low insertion loss, sharp transition, low return loss and wide bandwidth.

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Study of Some New Topologies and Associated Techniques Used for the Achievement of Planar Filters

Advances in Wireless Technologies and Telecommunication - Handbook of Research on Advanced Trends in Microwave and Communication Engineering ◽

10.4018/978-1-5225-0773-4.ch007 ◽

2017 ◽

pp. 205-243

Author(s):

Fouad Aytouna ◽

Mohamed Aghoutane ◽

Naima Amar Touhami ◽

Mohamed Latrach

Keyword(s):

Low Cost ◽

Cutoff Frequency ◽

Lowpass Filter ◽

Microstrip Filter ◽

Filter Structure ◽

Microwave Components ◽

Low Pass ◽

New Research ◽

Novel Design ◽

Research Studies

This chapter will treat firstly a summary of the filters synthesis by using Butterworth and chebyshev techniques. After that, a second part will be devoted to the design of planar filters using different techniques; this section will present some examples in bibliography. The aim of this part is to understand the different methods and steps followed to design planar filters, in the same time to discover and to define the different parameters which characterize a filter structure. Therefore, we have chosen some new research studies on low pass filers. The last part will present our contribution in designing planar filter. The first filter structure is a dual bandpass microstrip filter operating for DCS and Wimax applications, this section will introduce the different steps followed to achieve such filter. The second circuit is a novel design low cost microstrip lowpass filter with a cutoff frequency of 2.3 GHz. At the end, we will present a transformation of the microstrip filter to a CPW lowpass filter making it easy for integration with passive and active microwave components.

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Compact LowPass Filter with Wide StopBand Using Non-Uniform Microstrip Resonant Cells

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.263-266.15 ◽

2012 ◽

Vol 263-266 ◽

pp. 15-19

Author(s):

Yan Liang ◽

Xiao Ming Wu ◽

Bi Hua Tang ◽

Yong Le Wu

Keyword(s):

Microstrip Line ◽

Photonic Bandgap ◽

Impedance Matching ◽

Stop Band ◽

Cutoff Frequency ◽

Harmonic Suppression ◽

Lowpass Filter ◽

Measurement Results ◽

Better Than

In this paper, a novel compact microstrip lowpass filter is designed. The proposed filter which is etched on the 50 Ω microstrip line consists of four non-uniform 1-D microstrip photonic bandgap (PBG) cells with different cutoff frequency.. The demonstration lowpass filter with 2.2 GHz cutoff frequency is designed, fabricated and measured. The measurement results show that the band rejection effect is better than -20 dB from 2.8 GHz to 10 GHz, the insertion is less than 2 dB, and the length of filter is 5.6 cm long. Compared with the conventional filter, the proposed filter has smaller size. Meanwhile, it overcomes the problems of narrow stop-band and low harmonic suppression. Furthermore, the impedance matching is not need to be considered. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

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Compact Microstrip Lowpass Filter with Low Insertion Loss for UWB Medical Applications

Wireless Communications and Mobile Computing ◽

10.1155/2018/8430626 ◽

2018 ◽

Vol 2018 ◽

pp. 1-5 ◽

Cited By ~ 1

Author(s):

Mohammed A. Aseeri ◽

Meshaal A. Alyahya ◽

Hatim A. Bukhari ◽

Hussein N. Shaman

Keyword(s):

Insertion Loss ◽

Elliptic Function ◽

Ultra Wideband ◽

Medical Applications ◽

Lowpass Filter ◽

Attenuation Level ◽

Low Insertion Loss ◽

Line Elements ◽

Good Agreement ◽

Rejection Band

A microstrip lowpass filter based on transmission line elements for UWB medical applications is proposed in this paper. The filter is constructed of two symmetric shunt open-circuited stubs and three series unit elements. The filter is designed to exhibit an elliptic function response with equal ripple in the passband and the rejection band. A prototype is successfully designed, fabricated, and measured, where a good agreement is attained. The filter shows a high filtering selectivity and an ultra-wide stopband up to 20 GHz with an attenuation level of more than 20-dB. The filter is compact and has a low insertion loss and an ultra-wideband (UWB) rejection which makes it attractive for many technologies such as UWB medical applications.

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COMPACT WIDE STOPBAND QUASI-ELLIPTIC FUNCTION LOWPASS FILTER USING QUASI-LUMPED ELEMENTS

Progress In Electromagnetics Research Letters ◽

10.2528/pierl13032202 ◽

2013 ◽

Vol 39 ◽

pp. 151-159

Author(s):

Chen Miao ◽

Jin Xu ◽

Wen Wu

Keyword(s):

Elliptic Function ◽

Lowpass Filter ◽

Lumped Elements

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Generalized Chebyshev Highpass Filter based on Suspended Stripline Structure (SSS) for Wideband Applications

Jurnal Teknologi ◽

10.11113/jt.v68.2925 ◽

2014 ◽

Vol 68 (3) ◽

Author(s):

Z. Zakaria ◽

M. A. Mutalib ◽

M. S. M. Isa ◽

N. Z. Haron ◽

A. A. Latiff ◽

...

Keyword(s):

Communication Systems ◽

Cutoff Frequency ◽

Lowpass Filter ◽

Finite Frequency ◽

Transmission Zero ◽

Physical Volume ◽

Highpass Filter ◽

Filter Prototype ◽

Better Than ◽

Good Agreement

This paper presents the method to transform generalized Chebyshev lowpass filter prototype to highpass filter based on Suspended Stripline Structure (SSS) technology. The study involves circuit analysis to determine generalized Chebyshev responses with a transmission zero at finite frequency. The transformation of the highpass filter from the lowpass filter prototype produces a cutoff frequency of 3.1 GHz with a return loss better than -20 dB. The design is simulated and measured on a Roger Duroid RO4350 with a dielectric constant, ɛr of 3.48 and a thickness of 0.508 mm. The experimental results are in good agreement with the simulated results. This class of generalized Chebyshev highpass filter with finite transmission zero would be useful in any RF/ microwave communication systems particularly in wideband applications where the reduction of overall physical volume and weight as well as cost very important, while maintaining its excellent performance.

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Compact Elliptic function Lowpass Filter based on Defected Ground Structure

IEICE Electronics Express ◽

10.1587/elex.7.434 ◽

2010 ◽

Vol 7 (6) ◽

pp. 434-439 ◽

Cited By ~ 2

Author(s):

Reza Rouhi ◽

Changiz Ghobadi ◽

Javad Nourinia ◽

Saeid Pirani

Keyword(s):

Elliptic Function ◽

Lowpass Filter ◽

Defected Ground Structure ◽

Ground Structure

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Planar elliptic function lowpass filter with sharp roll-off and wide stopband

Microwave and Optical Technology Letters ◽

10.1002/mop.29520 ◽

2015 ◽

Vol 58 (1) ◽

pp. 133-136 ◽

Cited By ~ 10

Author(s):

P. M. Raphika ◽

P. Abdulla ◽

P. M. Jasmine

Keyword(s):

Elliptic Function ◽

Lowpass Filter

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Lowpass-filter flat magnitude characteristic with sharp cutoff

Electronics Letters ◽

10.1049/el:19750133 ◽

1975 ◽

Vol 11 (8) ◽

pp. 174 ◽

Cited By ~ 5

Author(s):

V. Jovanović ◽

D. Rabrenović

Keyword(s):

Lowpass Filter ◽

Sharp Cutoff

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Composite Lowpass Filter Realized by Image Parameter method and Integrated with Defected Ground Structures

INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY ◽

10.24297/ijct.v4i2c1.4176 ◽

2018 ◽

Vol 4 (2) ◽

pp. 583-591

Author(s):

Chandan Kumar Ghosh ◽

Arabinda Roy ◽

Susanta Kumar Parui

Keyword(s):

Impedance Matching ◽

Ground Plane ◽

Cutoff Frequency ◽

Parameter Method ◽

Lowpass Filter ◽

Microstrip Technology ◽

Rectangular Slot ◽

Lc Equivalent Circuit ◽

Defected Ground Structures ◽

Ground Structures

An asymmetric DGS consisting of two square headed slots connected transversely with a rectangular slot is etched in the ground plane underneath a high-low impedance microstrip line.Â It provides a band-reject filtering characteristics with sharp transition. Thus, it may be modeled as m-derived filter section. Accordingly, T-type LC equivalent circuit is proposed and LC parameters are extracted. A planar composite lowpass filter is designed by image parameter method and implemented by different DGS units. A composite filter requires at least three filter sections, of which two m-derived sections and one constant k-section. In proposed scheme, one such m-derived section is directly replaced by proposed DGS unit, whose cut-off frequency is same as that of designed m-derived section. The other m-derived section implemented by proposed DGS unit divided into equivalent two L-sections which will act as a termination for impedance matching. A constant k-section has been realized by a dumbbell shaped DGS having same cutoff frequency. Here lumped LC parameters are directly replaced by the equivalent LC values of the DGSs and therefore, produce almost ideal filter characteristics by overcoming the limitations of microstrip technology.

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