Uwb Filter Using Defected Ground Structure of Von Koch Fractal Shape Slot

An, Jian; Wang, Guangming; Zeng, Wei-Dong; Ma, and Lai-Xuan

doi:10.2528/pierl08121309

Cited by 30 publications

(21 citation statements)

References 12 publications

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“…The fractal edges compensate for the different even and odd mode phase velocities that produce the unwanted harmonic. The Koch fractal has been used as a defected ground plane resonator to achieve a UWB filter response [2]. In this case, the fractal structure is used mainly for its compactness, and 128% bandwidth is demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Investigations on an H-Fractal Wideband Microstrip Filter With Multi-Passbands and a Tuned Notch Band

Patin¹,

Labadie²,

Sharma³

2010

PIER B

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Abstract-This paper investigates an H-fractal wideband microstrip filter with multi-passbands and a tuned notch band for wireless communication frequencies. The four different filter configurations explored are: symmetric with zero offset, symmetric with nonzero offset, asymmetric with zero offset, and asymmetric with nonzero offset. The effect of H-fractal iterations, fractal scaling parameters, and stub offset on the filter's multi-passband response is presented. A comparison is made to a non-fractal straight stub filter of equivalent length showing improved passband bandwidth while maintaining the same overall response. Then an asymmetry is introduced into the fractal geometry to produce a tuned notch band in the second passband. Two fractal scaling factors are shown to aid in the tuning of the filter notch band. Finally, an asymmetric filter is fabricated on FR-4 substrate and experimentally verified, illustrating that the filter has multi-passbands and can find applications in WiFi/WiMAX transponders.The fabricated filter's first two passbands (with respect to S 11 = −10 dB) are from 2.09 GHz to 3.18 GHz (fractional bandwidth of 1.09 GHz, 41.36%) and from 4.1 GHz to 5.43 GHz (factional bandwidth of 1.33 GHz, 27.91%), both for WiFi applications along with a notch band (S 21 = −3 dB) from 3.3 GHz to 3.94 GHz (factional bandwidth of 0.64 GHz, 17.67%) to suppress co-site WiMAX transmission. The measured data agrees reasonably well with the simulated filter response.

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Section: Introductionmentioning

confidence: 99%

Investigations on an H-Fractal Wideband Microstrip Filter With Multi-Passbands and a Tuned Notch Band

Patin¹,

Labadie²,

Sharma³

2010

PIER B

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“…The parallel coupled-line microstrip filter fabricated on a printed circuit board usually has a relatively small bandwidth [15], which is mainly due to the fact that the reductions of strip width and strip spacing using conventional fabrication methods were limited. In [5][6][7][8][9], wideband filters having a wide FBW were achieved by using etched patterns in the ground plane or via holes. However, the structures with holes in the substrate or etched patterns in the ground plane have the disadvantages, such as package problems, sensitivity and difficult realization in monolithic microwave integrated circuits (MMICs).…”

Section: Introductionmentioning

confidence: 99%

“…Design of the bandpass filter is recently becoming stricter due to the increasing development of the Ultra-Wideband (UWB) systems, which attract great potential in various modern transmission systems, such as through-wall imaging, medical imaging, vehicular radar, indoor, and hand-held UWB systems, etc [1]. Being one of the important component blocks, efforts to develop wideband filters were made [2][3][4][5][6][7][8][9][10][11][12][13][14] in order to achieve such a specified fractional bandwidth (FBW, defined as 3 dB bandwidth over designed center frequency). In [2], a wideband equal-ripple filter with cascaded serial and shunt transmission-line sections produced a wide FBW of 54% and transmission zeros near the passband edges.…”

Section: Introductionmentioning

confidence: 99%

Design of the Compact Parallel-Coupled Lines Wideband Bandpass Filters Using Image Parameter Method

Ye¹,

Su²,

Weng³

et al. 2010

PIER

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Abstract-In this paper, the design of compact and high performance parallel coupled line wideband bandpass filter using image parameter method are proposed. The filter mainly comprising one-stage parallel coupled line and two open stubs are designed and implemented on commercial RT/Duroid 5880 substrate. The equivalent circuit of the proposed structure is initially derived by using the image parameter method. It is found that, the normalized bandwidth (NBW) of image impedance for the one-stage parallel coupled line has a relation to the electromagnetic (EM) simulated bandwidth. To further improve the selectivity, two open stubs are connected near the input/output (I/O) ports. The design procedures and their limitations are discussed in detail. The proposed filters are fabricated, measured and showing good characteristics of 87% fractional bandwidth as well as good insertion/return loss, flat group delay varies between 0.3-1.5 ns. High passband selectivity and wide stopband from 8-14 GHz are observed. The measured results are also having a good agreement with the simulated results.

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“…Desired strong coupling between feed lines and MMR is achieved by extremely narrow gap, leading to critical fabrication precision requirements. Then aperture-backed microstrip line technique is used to achieve the desired strong coupling with relatively easy fabrication gap [5,6]. Recently, broadside-coupled structures have received great attention due to the merit associated with the electromagnetic coupling [7,8].…”

Section: Introductionmentioning

confidence: 99%

Band-Notched Ultra-Wideband Bandpass Filter Using Dual-Mode Resonator Loaded Slotline

Guan¹,

Xiong²,

Yang³

et al. 2014

PIER Letters

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Abstract-In this article, a novel band-notched ultra-wideband (UWB) bandpass filter based on hybrid microstrip/slotline structure is proposed. A quad-mode stubs-loaded slotline resonator is fed by two orthogonal microstrip lines and ultra-wideband bandpass characteristic is excited. A stub-loaded dualmode microstrip resonator is externally loaded to the quad-mode slotline resonator, and a notched band with sharp roll-off characteristic is achieved. The circuit model for the dual-mode microstrip resonator loaded slotline is given and analyzed. The proposed filter is designed and fabricated. Simulated and measured return losses are −12 dB/−18 dB and −18 dB/−10 dB in lower and higher passband. The return loss in the notched band is greater than 15 dB.

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Uwb Filter Using Defected Ground Structure of Von Koch Fractal Shape Slot

Cited by 30 publications

References 12 publications

Investigations on an H-Fractal Wideband Microstrip Filter With Multi-Passbands and a Tuned Notch Band

Investigations on an H-Fractal Wideband Microstrip Filter With Multi-Passbands and a Tuned Notch Band

Design of the Compact Parallel-Coupled Lines Wideband Bandpass Filters Using Image Parameter Method

Band-Notched Ultra-Wideband Bandpass Filter Using Dual-Mode Resonator Loaded Slotline

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