Parallel-coupled line filters with enhanced stopband performances

Fathelbab, Wael M.; Steer, M.B.

doi:10.1109/tmtt.2005.859871

Cited by 41 publications

(19 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The modified PCLs are used for feedings of tunable filter [13] while the design formulas are not readily available. The feeding structure of the PCL filter in [14] is obtained based on Kuroda transformation, which may lead to unreasonable high line impedance impractical in fabrication.…”

Section: Transformer Feedings For Flexible Terminationsmentioning

confidence: 99%

“…On the basis of the specification, the required I/O external quality factors and are 11.09. One may obtain the corresponding and utilizing (14) and (15) by applying and . Eventually, the calculated slope parameters, parameters of Y-TF feeds, and impedances of PCL sections are concluded in Table IV for quick reference. The circuit-model simulations of this proposed PCL filter has been carried out using AWR Microwave Office and displayed in Fig.…”

Section: Bpf With Multiple Tzsmentioning

confidence: 99%

“…The filters [9], [10] on the foundation of anti-PCLs (both short and open ended) can be analyzed based on similar concepts aforementioned. As a whole, PCLs play a profound role in history of bandpass filter (BPF) development [11]- [14].…”

mentioning

confidence: 99%

See 2 more Smart Citations

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

Lin

2014

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

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.

show abstract

Section: Transformer Feedings For Flexible Terminationsmentioning

confidence: 99%

Section: Bpf With Multiple Tzsmentioning

confidence: 99%

See 1 more Smart Citation

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

Lin

2014

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…With the endless high demand in searching for more compact and lower cost resonators for microstrip diplexer design, a step impedance resonator (SIR) with hairpin structure is then selected, where the two open ended circuits of the conventional hairpin is replaced with a pair of capacitors or a pair of folded parallelcoupled lines. In addition, the SIR is suitable for microstrip filter design with a good out-of-band performance [1], where the 2 nd harmonic can be shifted away of at least more than twice the fundamental frequency by adjusting length ratio for a given impedance ratio. It is mandatory to the diplexer design where the spurious signal must reside outside the second higher passband [2].…”

Section: Introductionmentioning

confidence: 99%

A microstrip diplexer using folded hairpins

King

Ying

Tiong

2011

2011 IEEE International RF &Amp; Microwave Conference

View full text Add to dashboard Cite

This paper presents the design of a microstrip diplexer using step impedance resonator (SIR) with folded hairpin structure. The diplexer consists of two third-order Chebyshev bandpass filters operating at 0.9GHz and 1.8GHz within GSM frequencies band. A diplexer is constructed by connecting two filters to a Y-junction. There is no spurious responses reside within the two passband frequencies. A well agreement between simulation and experimental results has been obtained.

show abstract

“…The traditional design of parallel-coupled microstrip filters suffer from the spurious response at twice the passband frequency [2], and could limit their applications. Many methods had been proposed to overcome this problem [3][4][5]. [3] used over-coupled end stages to approach 2f 0 suppression.…”

Section: Introductionmentioning

confidence: 99%

A miniaturized parallel‐coupled microstrip filter using over‐coupled end stages with symmetrical tapped‐line structure

Lin

Liao

2008

Micro & Optical Tech Letters

View full text Add to dashboard Cite

In this article, a miniaturized parallel‐coupled microstrip filter is presented. The miniaturized design saves 80% circuit dimension compared to the conventional parallel‐coupled over‐coupled end stages filter with the symmetrical tapped‐line structure. Several design methods and miniaturization techniques were involved in this study to achieve 5f0 stopband suppression, including symmetrical tapped‐line, stepped‐impedance structure, bended and folded of transmission lines, and the coupling effect of microstrip‐lines. Also the asymmetrical tapped‐line structure is fabricated to achieve 6f0 stopband suppression. Good agreements between the simulated and measured results were also observed in all above cases. Furthermore, no lumped elements, via‐holes, and bonding wires are necessary for this miniaturized coupler, making it very useful for the modern wireless communication systems. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2271–2274, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23675

show abstract

Parallel-coupled line filters with enhanced stopband performances

Cited by 41 publications

References 24 publications

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

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

A microstrip diplexer using folded hairpins

A miniaturized parallel‐coupled microstrip filter using over‐coupled end stages with symmetrical tapped‐line structure

Contact Info

Product

Resources

About