Bandwidth Enhancement and Further Size Reduction of a Class of Miniaturized Elliptic-Function Low-Pass Filter

Nosrati, Mehdi; Abbaspour, Sara; Najafi, A.

doi:10.1007/978-0-387-77845-7_19

Cited by 6 publications

(13 citation statements)

References 5 publications

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“…To increase the band-width and reduce the size, this layout can be modified, and the structure shown in Fig. 1(c) can be realized as discussed in [6].…”

Section: (B)mentioning

confidence: 99%

“…To introduce the other resonator, initially, the structure of the conventional microstrip stepped-impedance semi-hairpin resonator in [6] is followed. This structure, as shown in Fig.…”

Section: The Proposed Semi-hairpin Resonatormentioning

confidence: 99%

“…2(c) can be realized. Similarly, the relationships between lumped and distributed elements can be obtained using derived equations in [6] as follows:…”

Section: The Proposed Semi-hairpin Resonatormentioning

confidence: 99%

“…To increase the width of pass-band, improve the performance and reduce the size, several types of elliptic-function low pass filters have been designed and proposed using modified hairpin resonators in recent years [5,6]. In some of these papers, the pass-band has been increased and in other ones, the authors have mainly focused on the size reduction.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Miniaturized Wide-Band Elliptic-Function Low-Pass Filter Using Microstrip Open-Loop and Semi-Hairpin Resonators

Hayati

Kakaee²,

Fard³

et al. 2009

PIER C

Self Cite

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Abstract-A highly miniaturized low-pass filter using microstrip open-loop and semi-hairpin resonators is designed and analyzed to enhance the bandwidth and further size reduction of this kind of elements. Initially, two microstrip open ring resonators and separately, two semi-hairpin resonators are arranged and attached back-to-back to each other respectively. A compact LPF is designed and simulated using these modified resonators. The size reduction of this proposed filter is reported about 65% with 190% enhancement of bandwidth in analogy with the conventional low-pass filters.Corresponding author: M. Hayati (hayati@razi.ac.ir). 244Hayati et al.

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“…To increase the band-width and reduce the size, this layout can be modified, and the structure shown in Fig. 1(c) can be realized as discussed in [6].…”

Section: (B)mentioning

confidence: 99%

“…To introduce the other resonator, initially, the structure of the conventional microstrip stepped-impedance semi-hairpin resonator in [6] is followed. This structure, as shown in Fig.…”

Section: The Proposed Semi-hairpin Resonatormentioning

confidence: 99%

“…2(c) can be realized. Similarly, the relationships between lumped and distributed elements can be obtained using derived equations in [6] as follows:…”

Section: The Proposed Semi-hairpin Resonatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Novel Miniaturized Wide-Band Elliptic-Function Low-Pass Filter Using Microstrip Open-Loop and Semi-Hairpin Resonators

Hayati

Kakaee²,

Fard³

et al. 2009

PIER C

Self Cite

View full text Add to dashboard Cite

show abstract

“…To increase the width of passband, improve the performance and reduce the size, several types of elliptic-function low pass filters using modified hairpin resonators have been designed and proposed in recent years [5][6][7]. In some of these papers the pass-band has been increased and in others, the authors have focused on one size reduction.…”

Section: Introductionmentioning

confidence: 99%

A Compact Composite Broad Stop-Band Elliptic-Function Low-Pass Filter for Ultra Wide-Band Applications Using Interdigital Capacitors

Nosrati¹,

Faraji²,

Atlasbaf³

2009

PIER Letters

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Abstract-A compact composite ultra wide-band elliptic-function low-pass filter is introduced by combining in cascade a microstrip stepped-impedance resonator using interdigital capacitor and an admittance inverter. A triple cascade low-pass filter is designed, analyzed and tested with this technique accompanied by its equivalent circuit model. This composition acts similar to a composite filter with desired attenuation and matching properties in order to obtain wide bandwidth and broad stop-band. The proposed low-pass filter features the sharpness of cut off frequency, low insertion loss, enhancement of bandwidth up to X-band frequencies and very compact size.Corresponding author: M. Nosrati (nosrati 1359@yahoo.com). 88Nosrati, Faraji, and Atlasbaf

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Clinicopathologic factors of the recurrent tumor predict outcome in patients with ipsilateral breast tumor recurrence

Panet-Raymond¹,

Truong²,

Alexander³

et al. 2010

Cancer

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BACKGROUND:The role of clinicopathologic characteristics of the recurrent tumor in determining survival in a cohort of patients with ipsilateral breast tumor recurrence (IBTR) was investigated. METHODS: Among 6020 women with pT1-T2, pN0-1, M0 treated with breast-conserving surgery from 1989 to 1999, 269 developed isolated IBTR. Ten-year Kaplan-Meier breast cancer-specific survival (BCSS) and overall survival (OS), calculated from date of IBTR, were analyzed according to clinicopathologic characteristics. RESULTS: Factors that were associated with diminished OS and BCSS on univariate analysis were: time to IBTR 48 months, lymphovascular invasion positive status, estrogen receptor (ER) negative status, high grade, clinical IBTR detection, biopsy alone, and close/positive margins (all P < .05). On multivariate analysis, time to IBTR 48 months (hazard ratio [HR], 1.87, P ¼ .012), lymphovascular invasion positive status (HR, 2.46; P < .001), ER negative status (HR, 2.08; P ¼ .013), high-grade recurrent disease (HR, 1.88; P ¼ .013), and close/positive margins after surgery for IBTR (HR, 1.94; P ¼ .013) retained significance for prediction of diminished OS. When stratified according to number of adverse prognostic features, 10-year OS was 70.4% in patients with 1 factor, 35.8% with 2 factors, and 19.9% with 3 or more factors (P < .001). CONCLUSIONS: Time to recurrence 48 months, lymphovascular invasion positive status, ER negative status, high-grade histology, and close/positive margins in association with the recurrent tumor are independent prognostic factors for survival after IBTR. The presence of 2 or more of these features at recurrence is significantly associated with poor OS. These criteria can be used to prognosticate and guide clinical decisions after recurrence.

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Bandwidth Enhancement and Further Size Reduction of a Class of Miniaturized Elliptic-Function Low-Pass Filter

Cited by 6 publications

References 5 publications

A Novel Miniaturized Wide-Band Elliptic-Function Low-Pass Filter Using Microstrip Open-Loop and Semi-Hairpin Resonators

A Novel Miniaturized Wide-Band Elliptic-Function Low-Pass Filter Using Microstrip Open-Loop and Semi-Hairpin Resonators

A Compact Composite Broad Stop-Band Elliptic-Function Low-Pass Filter for Ultra Wide-Band Applications Using Interdigital Capacitors

Clinicopathologic factors of the recurrent tumor predict outcome in patients with ipsilateral breast tumor recurrence

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