Sharp-Rejection Ultra-Wide Bandstop Filters

Velidi, Vamsi Krishna; Guntupalli, A.B.; Sanyal, Subrata

doi:10.1109/lmwc.2009.2024834

Cited by 42 publications

(40 citation statements)

References 8 publications

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“…However, the bandwidth of this filter is narrow and the upper band-stop center frequency is located at three times of the operating center frequency in the fundamental stopband. To meet the requirement of low insertion loss and sharp rejection, various structures and bandwidth enhancement technologies for band-stop filters have been developed in recent years [2][3][4][5][6][7][8][9]. For example, a compact band-stop filter using Defected Microstrip Structure (DMS) by etching Open Square Ring (OSR) is proposed in [2], which has low insertion loss in the passband and high rejection level.…”

Section: Introductionmentioning

confidence: 99%

Design of Compact Wideband High-Selectivity Band-Stop Filter Based on Coupled Lines

Rao¹,

Wu²,

Wang³

et al. 2014

PIER C

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Abstract-In this paper, a compact band-stop filter with a wideband and high-selectivity performance is proposed and analyzed. This band-stop filter includes two parallel-coupled lines of different electrical lengths and two open-circuit stubs. A lossless transmission line model is used to obtain the filter design parameters. In order to verify this new filter circuit structure and its corresponding design theory, five groups of numerical examples are demonstrated. Finally, a practical band-stop filter with a 3-dB cutoff frequency bandwidth of 58.2% centered at 0.94 GHz has been designed, simulated and measured. The measured results show a good agreement with the simulated responses.

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Section: Introductionmentioning

confidence: 99%

Design of Compact Wideband High-Selectivity Band-Stop Filter Based on Coupled Lines

Rao¹,

Wu²,

Wang³

et al. 2014

PIER C

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“…Obviously, the conventional band-stop filter [1], which is based on a quarter-wavelength open-circuit stub, has two obvious disadvantages including narrow bandwidth and an upper band-stop center frequency located at three times of the operating center frequency in the fundamental stop band. On the one hand, different bandwidth enhancement technologies for band-stop filters have been investigated in [11][12][13][14][15][16][17][18]. For examples, a cross-coupled general configuration is proposed to create a ripple and wide stop band in [11].…”

Section: Introductionmentioning

confidence: 99%

“…Signal interference techniques are also applied to design compact wideband band-stop filters in [12][13][14]. At the same time, modified stubs are also researched to construct wideband band-stop filters in [15,16] while a multilayer broadside-coupled microstrip-slotmicrostrip structure in [17] is used to design a band-stop filter for ultra wideband applications. In addition, multi-band band-stop filter has been developed by using transversal coupling network in [18].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, un-modifying the ground plane, a novel defected microstrip structure by etching in-line open stubs is proposed to design microstrip narrow band-stop filter in [20]. Note that the above-mentioned band-stop filters [11][12][13][14][15][16][17][18][19][20] cannot overcome the disadvantage of the repeating stop band at odd multiples of the center frequency of fundamental stop band. In order to remove the limitation of the second harmonic response in the conventional bandstop filters, two-section stepped-impedance stubs [21,22] and crosscoupled stepped-impedance resonators [23] are proposed in the design of band-stop filters with extended upper passbands.…”

Section: Introductionmentioning

confidence: 99%

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A Coupled-Line Band-Stop Filter With Three-Section Transmission-Line Stubs and Wide Upper Pass-Band Performance

Wu¹,

Liu²

2011

PIER

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Abstract-A novel band-stop filter with wide upper pass-band performance is proposed and discussed in this paper. This bandstop filter includes two three-section transmission-line stubs and a parallel coupled-line section. Because three-section transmission-line stubs and coupled-line section are used, this filter not only features good band-stop filtering property, but also has wide upper pass band. In order to verify this new filter circuit structure and its corresponding design theory, three groups of numerical examples are demonstrated. Finally, two practical band-stop filters using common microstrip technology are designed, simulated and measured. The simulated and measured results indicate that both the coupled-line section with weak coupling and two three-section stubs can improve the upper pass-band performance. Furthermore, the measured results of the second fabricated microstrip band-stop filter (Filter B) show that the 20-dB insertion-loss band-stop bandwidth at 0.46 GHz is 90 MHz and the 1.2-dB transmission coefficient upper pass band is from 0.66 GHz to 2.52 GHz. Thus, the highest pass-band frequency is extended to larger than five times of the operating center frequency of stop band.

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“…The split impedance ring filter of [4] contributes two additional zeros, while [5] describes a split impedance ring with three additional stubs. The physical structure of the filter in [6] resembles that of a third order elliptic function filter.…”

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confidence: 99%

Double resonant stub bandstop filter with pseudo-elliptic response

Malherbe¹,

Reid²

2010

Electron. Lett.

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A simple wideband bandstop filter that yields equal ripples in both the pass and stop bands, is described. The filter comprises only of two resonant stubs and a connecting transmission line and has a transmission response almost identical to that of a third order elliptic function filter. The practical bandwidth is limited to 130-160%.Introduction: High rates of cutoff for wideband bandstop fitters are achieved if the filter prototype has a transfer function contributing transmission zeros at real frequencies away from the filter centre frequency, such as the elliptic function (Cauer) filters. The design procedures for transmission line filters employing elliptic function prototypes are widely described, and various forms of realization of such filters are available [1]. A number of authors have proposed and developed realizations of wideband bandstop filters that either realize true elliptic function responses, or pseudo-elliptic function responses by realizing additional transmission zeros at real frequencies.

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Sharp-Rejection Ultra-Wide Bandstop Filters

Cited by 42 publications

References 8 publications

Design of Compact Wideband High-Selectivity Band-Stop Filter Based on Coupled Lines

Design of Compact Wideband High-Selectivity Band-Stop Filter Based on Coupled Lines

A Coupled-Line Band-Stop Filter With Three-Section Transmission-Line Stubs and Wide Upper Pass-Band Performance

Double resonant stub bandstop filter with pseudo-elliptic response

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