Transversal-Coupled-Line Dual-Band Bandpass Planar Filters With Quasi-Elliptic-Type Response

Yang, Li; Malki, Mohamed; Fan, Maoyu; Gómez‐García, Roberto

doi:10.23919/eumc50147.2022.9784230

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…As shown in Figure 1a, it consists of two main circuit parts, which are: (i) a triple‐passband TFS version of the dual‐passband TFS that was reported in Ref. [51] and ii) open‐circuit‐ended stubs at the input/output accesses of the triple‐passband TFS. The RF operational mechanisms of this class of quad‐band BPF stage in the shaping of its overall four‐band bandpass filtering transfer function, as illustrated in Figure 1b, is described below: Its constituent triple‐band bandpass TFS has two signal‐propagation paths composed of coupled‐line stages, along with transmission‐line segments and open‐circuit‐ended stubs.…”

Section: Theoretical and Design Foundationsmentioning

confidence: 99%

Combined signal‐interference/split‐type microwave multi‐band bandpass filters

Malki

Yang

Gómez‐García

2023

IET Microwaves Antenna & Prop

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Two classes of RF/microwave planar quad-band bandpass filters (BPFs) that simultaneously exploit transversal signal-interference and multi-passband-splitting mechanisms are reported. The first approach makes use of a triple-band bandpass transversal filtering section (TFS) composed of two in-parallel stepped-impedance coupled-line signalpropagation paths.By inserting an open-ended stub at the input and output terminals of this TFS, its middle passband is divided into two sub-bands to attain an overall quadpassband filtering response. The second configuration employs a dual-passband TFS based on a coupled-line directional coupler with open-ended stubs at its direct and coupled ports. By loading such TFS with a replica of it at the direct and coupled ports of its coupler, the two passbands are split into four sub-bands to obtain the quad-band functionality. The RF operational foundations of these quad-band BPFs, along with single-and multi-stage design examples featuring sharp-rejection four-passband filtering responses with transmission zeros (TZs), are detailed. Moreover, for experimentaldemonstration purposes, two microstrip prototypes are developed and tested. Besides, as a further application, a two-layer balanced-circuit version with ultra-broad commonmode (CM) suppression of the constituent triple-passband TFS of the first prototype is built and measured.

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Section: Theoretical and Design Foundationsmentioning

confidence: 99%

Combined signal‐interference/split‐type microwave multi‐band bandpass filters

Malki

Yang

Gómez‐García

2023

IET Microwaves Antenna & Prop

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“…In this paper, as an extension of the preliminary work from the authors in [20] for the single-ended case, an original type of balanced quasi-elliptic-type dual-band BPFs is developed. In differential-mode operation, they exploit as basic building block a two-path coupled-line-based transversal filtering section in which a second-order sharp-rejection dual-band BPF response with several close-to-passband transmission zeros (TZs) at both passband sides is obtained.…”

Section: Introductionmentioning

confidence: 99%

Balanced quasi-elliptic-type dual-passband filters using planar transversal coupled-line sections and their digital modeling

Yang

Malki²,

Muñoz‐Ferreras³

et al. 2022

Int. J. Microw. Wireless Technol.

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A class of balanced dual-band bandpass filters (BPFs) with planar transversal-signal-interference coupled-line sections is reported. In their building balanced dual-band BPF stage under differential-mode excitation, a second-order quasi-elliptic-type dual-band bandpass filtering transfer function is obtained. Specifically, from the transversal interaction among their two open-ended and virtually-short-ended half-wavelength coupled-line paths, sharp-rejection differential-mode dual passbands with several out-of-band transmission zeros at both sides are realized. To attain high common-mode suppression levels within the differential-mode passbands, two open-ended line segments are connected at the symmetry plane of the devised balanced dual-band BPF stage. Moreover, higher-order schemes based on in-series-cascaded multi-stage designs to further increase differential-mode selectivity and in-band common-mode rejection are illustrated. The operational principles and parametric-analysis design rules of the engineered transversal-coupled-line-based balanced dual-band BPF approach are detailed. Additionally, for a rigorous interpretation of their zero/pole characteristics, a digital-modeling framework is applied to them to connect RF balanced filters with their discrete-time versions. For practical-validation purposes, a microstrip prototype of two-stage/fourth-order balanced dual-band BPF is built and tested. It exhibits measured differential-mode dual passbands with center frequencies of 1.464 GHz and 2.294 GHz, 3-dB fractional bandwidths of 8.74% and 9.68%, and in-band common-mode rejection levels above 23.16 dB and 31.36 dB, respectively.

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Transversal-Coupled-Line Dual-Band Bandpass Planar Filters With Quasi-Elliptic-Type Response

Cited by 2 publications

References 16 publications

Combined signal‐interference/split‐type microwave multi‐band bandpass filters

Combined signal‐interference/split‐type microwave multi‐band bandpass filters

Balanced quasi-elliptic-type dual-passband filters using planar transversal coupled-line sections and their digital modeling

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