Design and analysis of UWB band pass filter with ring filter

Ishida, Hideyuki; Araki, Kiyomichi

doi:10.1109/mwsym.2004.1338806

Cited by 175 publications

(139 citation statements)

References 1 publication

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“…In his apparatus, the powder is uniaxially pressed between two ceramic punches while the current is alternately applied to a group of electrode pairs located around the die surface. An improvement was proposed by Ishida et al [110] who used nonconductive punches to achieve much larger pressures. An alternative method was proposed by Tokita and Miyake [111], so-called Super high-speed temperature rise sintering in which the currents are driven by the electrodes surrounding the die (figure 17) and the pressure is exerted by the upper and lower punches which also act as electrodes.…”

Section: Application Of Current From Die Side Facesmentioning

confidence: 99%

Electric current activated/assisted sintering (ECAS): a review of patents 1906–2008

Grasso

Sakka

Maizza

2009

Science and Technology of Advanced Materials

402

231

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The electric current activated/assisted sintering (ECAS) is an ever growing class of versatile techniques for sintering particulate materials. Despite the tremendous advances over the last two decades in ECASed materials and products there is a lack of comprehensive reviews on ECAS apparatuses and methods. This paper fills the gap by tracing the progress of ECAS technology from 1906 to 2008 and surveys 642 ECAS patents published over more than a century. It is found that the ECAS technology was pioneered by Bloxam (1906 GB Patent No. 9020) who developed the first resistive sintering apparatus. The patents were searched by keywords or by cross-links and were withdrawn from the Japanese Patent Office (342 patents), the United States Patent and Trademark Office (175 patents), the Chinese State Intellectual Property Office of P.R.C. (69 patents) and the World Intellectual Property Organization (12 patents). A subset of 119 (out of 642) ECAS patents on methods and apparatuses was selected and described in detail with respect to their fundamental concepts, physical principles and importance in either present ECAS apparatuses or future ECAS technologies for enhancing efficiency, reliability, repeatability, controllability and productivity. The paper is divided into two parts, the first deals with the basic concepts, features and definitions of basic ECAS and the second analyzes the auxiliary devices/peripherals. The basic ECAS is classified with reference to discharge time (fast and ultrafast ECAS). The fundamental principles and definitions of ECAS are outlined in accordance with the scientific and patent literature.

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Section: Application Of Current From Die Side Facesmentioning

confidence: 99%

Electric current activated/assisted sintering (ECAS): a review of patents 1906–2008

Grasso

Sakka

Maizza

2009

Science and Technology of Advanced Materials

402

231

View full text Add to dashboard Cite

show abstract

“…As one of many such research activities, the design methods of bandpass filters have been reported [1][2][3]. Ishida and Araki [1] designed the UWB bandpass filter whose bandwidth is formed by adding notches in the sections of the transmission line. So, it shows very narrow stopband.…”

Section: Introductionmentioning

confidence: 99%

Compact UWB Bandpass Filter as Cascaded Center-Tapped CRLH Transmission-Line ZORs for Improved Stopband

Lee¹,

Kahng²,

Wu³

2013

Journal of Electrical Engineering and Technology

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-The design of a new compact UWB bandpass filter is proposed, which has cascaded center-tapped microstrip composite right/left-handed transmission-line zeroth-order resonators (CRLH-TL ZORs). In an attempt to reduce the size, instead of the conventional half-wavelength resonators or periodic and multiple CRLH-TL cells, only one cell ZOR geometry is adopted as each resonator in the filter. Additionally, two center-tapped ZORs are coupled to increase the slope of the skirt. Besides, stepped impedance matching parts are placed in the paths to the input and output ports to enhance passband and stopband performances. The proposed filter is shown to have the overall size of 0.69 g λ × 0.70 g λ , the insertion loss much less than 1 dB, and an acceptable return loss performance in the predicted and measured results.

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“…As one of many such research activities, the design methods of bandpass filters have been reported [6][7][8][9][10]. Araki et al [6] designed the UWB bandpass filter whose bandwidth is formed by adding zeros in the sections of the transmission line. The frequency response has notches at the specific points as the very narrow regions for out-of-band suppression.…”

Section: Introductionmentioning

confidence: 99%

Ultrawideband Bandpass Filter Using Composite Right- and Left-Handedness Line Metamaterial Unit-Cell

Kahng¹

2010

Advanced Microwave and Millimeter Wave Technologies Semiconductor Devices Circuits and Systems

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The design of a new UWB bandpass filter is proposed, which is based upon the microstrip Composite Right-and Left-Handed Transmission-line(CRLH-TL). In order to bring the remarkable improvement in an attempt to reduce the size, taking the features of the conventional periodic CRLH-TL, only one unit of the structure is chosen. So the component less than a quarter-wavelength is realized to achieve the ultra wide band filtering without the loss of the original advantage of the CRLH-TL. Guaranteeing the compactness in size, the interdigitated coupled lines are used to realize the strong coupling for the design that will be shown to have the size of 'guided wavelength/9.4', the fractional bandwidth over 100%, the insertion loss much less than 1 dB, and the flat group-delay with an acceptable return loss performance in the predicted and measured results.

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Design and analysis of UWB band pass filter with ring filter

Cited by 175 publications

References 1 publication

Electric current activated/assisted sintering (ECAS): a review of patents 1906–2008

Electric current activated/assisted sintering (ECAS): a review of patents 1906–2008

Compact UWB Bandpass Filter as Cascaded Center-Tapped CRLH Transmission-Line ZORs for Improved Stopband

Ultrawideband Bandpass Filter Using Composite Right- and Left-Handedness Line Metamaterial Unit-Cell

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