Compact Broadband Planar Filters

Menzel, Wolfgang; Li, Zhu; Wu, Ke; Bogelsack, F.

doi:10.1109/euma.2001.338962

Cited by 18 publications

(25 citation statements)

References 4 publications

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“…1. With these ideas in mind, more complex and high-performance filter structures can be conceived [2]. In Section II, a first straightforward application of the involved inverter principles is presented, resulting in both microstrip and suspended stripline (SSL) filters.…”

Section: Introductionmentioning

confidence: 99%

On the design of novel compact broad-band planar filters

Menzel

et al. 2003

IEEE Trans. Microwave Theory Techn.

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149

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Abstract-On the basis of impedance steps and coupled-line sections as inverter circuits, novel wide-band and very compact filters are presented. The application of alternately high-and low-impedance lines presented to the connected transmission-line resonators partly reduces their lengths to a quarter-wavelength only. In addition, effective techniques are demonstrated to reduce spurious stopband resonance resulting from a remaining half-wavelength resonator. Both suspended stripline (SSL) and microstrip filters were designed, fabricated, and tested, proving this concept in an excellent way. For the prototype filters, center frequencies around 6 GHz were selected. Bandwidths are between 2.5-3.25 GHz, and insertion-loss amounts to around 0.25 dB for the microstrip filters and 0.5 dB (including the transitions to coaxial line) for the SSL filters, respectively. For the selected center frequency and on a substrate with a dielectric constant of 10.8, the smallest microstrip filter is only 15 mm 5 mm in size.Index Terms-Broad-band planar bandpass filter, impedance inverter circuits, multipole resonator.

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Section: Introductionmentioning

confidence: 99%

On the design of novel compact broad-band planar filters

Menzel

et al. 2003

IEEE Trans. Microwave Theory Techn.

Self Cite

149

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“…Although a single microstrip stepped-impedance resonator, which is tightly coupled to the input/output lines, is capable of producing an ultra-wideband filter covering the 3.1-10.6 GHz frequency range, its attenuation on both sides of the passband is rather poor [6,9]. On the other hand, cascading multiple stepped-impedance resonators features good performance in both passband and stopband regions, but the designs require rather long, thus spacious areas on printed-circuit boards [25,26].…”

Section: Introductionmentioning

confidence: 99%

“…Conventional configurations of the stepped-impedance resonator (SIR) and traditional microstrip filter designs require very small gaps between the coupled segments, hence resulting in high manufacturing accuracy, and thus, higher expenses [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A modified design approach for compact ultra-wideband microstrip filters

Mokhtaari

Børnemann

Amari

2009

Int J RF and Microwave Comp Aid Eng

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A modified design approach for compact ultra-wideband microstrip filters with cascaded/folded stepped-impedance resonators is described. The key feature of the proposed method is to facilitate stronger coupling between stepped-impedance resonators and, at the same time, eliminate the requirement of extremely small gaps in coupled-line sections, as found in traditional designs. Simulations and measurements demonstrate that the filters designed with this technique exhibit good reflection, insertion-loss, and group-delay performance within the 3.1-10.6 GHz band.

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“…Extensive work has been carried out to achieve wide band characteristics in the filter performance. A compact wide band filter has been designed based on impedance steps and coupled line sections [1]. Ground plane metallization is removed in these filters to achieve wide band response.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of a Compact Multi-Layer Ultra Wide Band Filter

Packiaraj¹,

Vinoy²,

Kalghatgi³

2009

PIER C

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Abstract-This paper presents analysis and design of a compact ultra wide band (UWB) filter using three parallel folded coupled lines in a defected ground structure in multi-layer structure. Defected ground has been incorporated under the coupled lines of the filter to improve the coupling over a wide bandwidth. The closed form expressions for even and odd mode impedances for the coupled lines with defected ground have been obtained to design a filter of desired bandwidth with the proposed structure. Based on circuit models, an UWB filter for 3.1-10.6 GHz has been analyzed and the results have been compared using full wave simulations. Analytical results are satisfactorily matching with simulations. Filter exhibits a constant group delay of ± 0.08 ns in the pass band. Size of the filter is 6.2 mm × 3.4 mm × 2.8 mm.

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Compact Broadband Planar Filters

Cited by 18 publications

References 4 publications

On the design of novel compact broad-band planar filters

On the design of novel compact broad-band planar filters

A modified design approach for compact ultra-wideband microstrip filters

Analysis and Design of a Compact Multi-Layer Ultra Wide Band Filter

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