Miniature Planar Uwb Bandpass Filters With Circular Slots in Ground

Naghshvarianjahromi, Mahdi; Tayarani, Majid

doi:10.2528/pierl08020902

Cited by 69 publications

(41 citation statements)

References 10 publications

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“…The −3 dB cut off frequencies are from 9.5 GHz to 10.7 GHz and the designed filter has 57% compactness compared to the conventional air-filled filter. A miniature planar UWB filter with circular slots in ground is presented in [18]. It has slight ripple of insertion loss throughout the pass band from 3.14 GHz to 8.28 GHz with a compact size 15 × 12.4 mm 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Several experiments, methods and techniques had been studied purposely to expand the bandwidth of bandpass filters in the past decade. Some of them were employing methods from dielectric filled waveguides, trisection substrate-integrated waveguide, resonators, coplanar waveguide, quarter-wavelength short-circuited stubs and/or open-circuited stubs, and hairpin [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel Compact Microstrip Ultra-Wideband Filter Utilizing Short-Circuited Stubs With Less Vias

Razalli¹,

Ismail²,

Mahdi³

et al. 2008

PIER

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Abstract-We present here a new pattern with compact size of Ultra Wideband (UWB) microwave filter. The filter is based on quarter-wave length short-circuited stubs model. We introduced here a new schematic model by extracting all parasitic elements such as Tjunction and discontinuity in our new pattern of UWB filter. This new filter has minimal number of vias and improved frequency bandwidth, insertion loss and return loss. It is fabricated on RT Duroid 5880 with 0.508 mm of substrate thickness. The final dimension is measured as 21 mm × 14 mm. It is not only compact, but also delivers excellent scattering parameters with magnitude of insertion loss, |S 21 | lower than 0.85 dB and return loss better than −11.6 dB. The fractional bandwidth is 109% from 3.06 GHz to 10.43 GHz. In the pass band, the measured group delay varies in between 0.47 ns to 0.32 ns, showing stability with minimum variation of only 0.15 ns. † The first author is also with School of Computer and Communication Engineering,

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Compact Microstrip Ultra-Wideband Filter Utilizing Short-Circuited Stubs With Less Vias

Razalli¹,

Ismail²,

Mahdi³

et al. 2008

PIER

View full text Add to dashboard Cite

show abstract

“…Several reports have been published in [2][3][4][5][6][7][8][9][10][11][12] with a variety of new methods, techniques and formulas in bandpass filter studies. As reported in [2] is a compact coplanar waveguide structure which is developed from a quasi-lumped elements.…”

Section: Introductionmentioning

confidence: 99%

“…It is composed of two cascaded interdigital hairpin resonators unit. Another type of UWB bandpass filter in [7] uses coupling method which employs a new technique by etching a wideband circular-shape slot resonator in the ground plane.…”

Section: Introductionmentioning

confidence: 99%

Novel Compact "Via-Less" Ultra-Wide Band Filter Utilizing Capacitive Microstrip Patch

Razalli¹,

Ismail²,

Mahdi³

et al. 2009

PIER

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Abstract-This paper presents a novel compact "via-less" UWB filter derived from a quarter-wavelength short-circuited stubs model. In this compact "via-less" UWB filter, there is no connecting vias as short circuit elements. Unlike its previous model that has 5 short-circuited stubs, this novel shape consists of two pairs of stubs which are joint together to share on the same microstrip patch and thus reduces total size of the UWB filter itself making it more compact in nature. With proper width optimization, the microstrip patch is able to decouple and provides low impedance to the ground in the UWB frequencies range. The filter delivers 3.85 GHz to 10.44 GHz frequency range with 92.23% of fractional bandwidth. The magnitude of insertion loss is below than 0.53 dB and the return loss is lower than −14.8 dB in the passband frequencies. The −3 dB bandwidth is from 3.85 GHz to 10.44 GHz with 92.23% of fractional bandwidth. The group delay only varied by 0.47 ns in the passband, which makes it suitable for radio communication systems.

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“…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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Miniature Planar Uwb Bandpass Filters With Circular Slots in Ground

Cited by 69 publications

References 10 publications

Novel Compact Microstrip Ultra-Wideband Filter Utilizing Short-Circuited Stubs With Less Vias

Novel Compact Microstrip Ultra-Wideband Filter Utilizing Short-Circuited Stubs With Less Vias

Novel Compact "Via-Less" Ultra-Wide Band Filter Utilizing Capacitive Microstrip Patch

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

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