A dual-plane comb-line filter having plural attenuation poles

Kitamura, Toshiaki; Horii, Yasushi; Geshiro, Masahiro; Sawa, Shinnosuke

doi:10.1109/22.993427

Cited by 14 publications

(9 citation statements)

References 3 publications

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“…1(b) can be determined by (8) and (9), respectively (8) (9) where can be calculated by (10) The center frequency of the bandpass filter can be approximated by averaging the even-and odd-mode frequencies [9] as (11) The coupling between the two resonators is characterized by the coupling coefficient [8], [9], which can be computed by using the knowledge of the even-and odd-mode frequencies (12) For a narrow-band operation, the external Q-factor (13) of the tapped line quarter-wavelength resonator can be extracted from the circuit model as (13) where is the admittance of the source. The interstage coupling parameter for second-order quarter-wavelength filter function is given by [8] ( 14) where and are the element values of the low pass filter prototype, and denotes the fractional bandwidth.…”

Section: Model-based Filter Designmentioning

confidence: 99%

“…Many publications in the literature have reported on how to reduce the filter size without sacrificing the filter performance [1]- [13]. Normally, a quarter-wavelength resonator [10], [11] has a smaller size as compared to the half-wavelength resonator [1]- [3] or dual-mode ring resonator [4], [5]. Recently, the common via configuration filter with source-load coupling was introduced in [14] to reduce the filter size and improve the performance.…”

Section: Introductionmentioning

confidence: 99%

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An Ultra-Compact Planar Bandpass Filter With Open-Ground Spiral for Wireless Application

Ma¹,

Yeo

et al. 2008

IEEE Trans. Adv. Packag.

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A common via filter is investigated and designed by using a proposed scalable lumped circuit model. The model-based result of the filter agrees well with that of the measurement. An ultra-compact open-ground spiral filter is proposed based on the common via filter. The open-ground spiral resonators are used to design second-order and fourth-order bandpass filters. The filter layouts, which affect filter performance in both passband and stopband, are investigated. The advantages of the open-ground spiral filter include not only its ultra-compact size (only 0 024 0 0 025 0 ) but also its additional transmission zero points and controllable stopband. Index Terms-Bandpass filter, odd-and even-mode, openground spiral resonator, scalable circuit model, separate electric and magnetic coupling paths, zero point.

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Section: Model-based Filter Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Ultra-Compact Planar Bandpass Filter With Open-Ground Spiral for Wireless Application

Ma¹,

Yeo

et al. 2008

IEEE Trans. Adv. Packag.

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“…Various approaches are proposed to create additional TZs around the passband, e.g., cascaded trisection/cascaded-quadruplet (CT/CQ) topology utilizing crosscoupled characteristics [19]- [22], the extraction-pole method [23], source-load coupling [24], a 0 feed structure [25], or other TZ-introducing mechanisms [26]- [28]. Those filters developed in [19]- [24] usually concern producing additional coupling paths, thus the coupling matrix needs to be resynthesized to maintain the targeted filter response.…”

mentioning

confidence: 99%

“…Those filters developed in [19]- [24] usually concern producing additional coupling paths, thus the coupling matrix needs to be resynthesized to maintain the targeted filter response. Certain works [25]- [28] skillfully use special coupling mechanisms or feeding structures to achieve TZ creation without necessitating extra coupling paths. However, those aforementioned methods [18]- [28] may not easily be applied in BPFs based on regular PCLs of inline direct-coupled topology since most of the works require skillful resonator arrangements, alternative coupling structures of inverse polarities, or additional coupling paths.…”

mentioning

confidence: 99%

“…Certain works [25]- [28] skillfully use special coupling mechanisms or feeding structures to achieve TZ creation without necessitating extra coupling paths. However, those aforementioned methods [18]- [28] may not easily be applied in BPFs based on regular PCLs of inline direct-coupled topology since most of the works require skillful resonator arrangements, alternative coupling structures of inverse polarities, or additional coupling paths. It is a potential research topic to bring about the TZs and still maintain the inline simplicity of PCL filters.…”

mentioning

confidence: 99%

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Coupled-Line Filters With Stub-Embedded Resonators Using Accurate Admittance-Transformer Feeds for Flexible Terminations

Lin

2014

IEEE Trans. Microwave Theory Techn.

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Accurate admittance-transformer (Y-TF) feeds along with short-circuited stub-embedded resonators (SCSERs) are proposed in this study to design the improved parallel coupled-line (PCL) filters with structure-inherent transmission zeros (TZs). The proposed Y-TF feeds for flexible terminations are thoroughly analyzed and found more accurate than conventional approximate tapped-line feedings. Specifically, two basic parallel-coupled bandpass filters with conventional stepped-impedance resonators are first successfully implemented to validate the proposed Y-TF feedings. The ideal frequency responses of the two filters by a circuit simulator are compared with those transformed from the coupling matrix. Furthermore, an SCSER-based filter with multiple TZs is designed to verify the feasibility of the described design procedure. The adopted resonating components are composed of two short-circuited stepped-impedance stubs and multiple opencircuited ones all extended from a common joining point. The interstage couplings of the filter are achieved by the short-ended PCLs, while the input/output couplings are realized by the proposed Y-TF feedings. Through the fabrication of the proposed filters, the measured results along with the simulated ones validate the theoretical derivations.

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Multistage dual-plane comb-line filter excited by conductor-backed coplanar waveguide

Horii

Kitamura²,

Geshiro³

et al.

APMC 2001. 2001 Asia-Pacific Microwave Conference (Cat. No.01TH8577)

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A dual plane comb-line filter consisting of conductor-backed CPW is proposed in this paper. It is shown through numerical simulations by means of the FD-TD method that this filter has an attenuation pole just below the pass band in contrast to conventional uniplane-based-CPW comb-line filters having an attenuation pole on the other side of the pass band. We also investigate the filtering characteristics from both numerical simulations and experiments when the resonators are formed in the step-impedance structure. The validity of FD-TD simulations has been comfirmed through a careful comparison between the numerical results and measurements.

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A dual-plane comb-line filter having plural attenuation poles

Cited by 14 publications

References 3 publications

An Ultra-Compact Planar Bandpass Filter With Open-Ground Spiral for Wireless Application

An Ultra-Compact Planar Bandpass Filter With Open-Ground Spiral for Wireless Application

Coupled-Line Filters With Stub-Embedded Resonators Using Accurate Admittance-Transformer Feeds for Flexible Terminations

Multistage dual-plane comb-line filter excited by conductor-backed coplanar waveguide

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