A Compact and Low-Loss Bandpass Filter Using Self-Coupled Folded-Line Resonator With Capacitive Feeding Technique

Hou, Zhang Ju; Yang, Yang; Zhu, Xi; Li, Yuan Chun; Dutkiewicz, Eryk; Xue, Quan

doi:10.1109/led.2018.2864597

Cited by 36 publications

(18 citation statements)

References 11 publications

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“…The cost of estimating the inverse sensitivity matrix J x at xF (1) was 41 simulations of the coupler. Similarly as for the first example, the assessment function (10) was utilized with the acceptance threshold fa.max = 0.2. In this case, the quality of the initial design was sufficient (i.e., fa(xF (k.0) )  fa.max) for most of the designs, but in some cases, the correction step and objective relaxation was necessary.…”

Section: B Example 2: Branch-line Coupler (Blc)mentioning

confidence: 99%

“…These issues are particularly pertinent to miniaturized microwave components where traditional design methods involving network-equivalent models are only capable of yielding initial designs that require further tuning [5], [6]. Furthermore, the layouts of compact structures are typically described using larger numbers of parameters than the conventional circuits, because their construction involves slow-wave-based [7] building blocks such as compact microstrip resonant cells (CMRCs) [8], defected ground structures (DSGs) [9], or transmission line (TL) folding [10]. For the same reasons, the simulation of such circuits is longer, yet, EM-based design closure is mandatory due to the presence of crosscoupling effects, reliable quantification of which requires EM analysis.…”

Section: Introductionmentioning

confidence: 99%

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On Computationally-Efficient Reference Design Acquisition for Reduced-Cost Constrained Modeling and Re-Design of Compact Microwave Passives

Koziel

Pietrenko‐Dabrowska

2020

IEEE Access

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Section: B Example 2: Branch-line Coupler (Blc)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On Computationally-Efficient Reference Design Acquisition for Reduced-Cost Constrained Modeling and Re-Design of Compact Microwave Passives

Koziel

Pietrenko‐Dabrowska

2020

IEEE Access

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“…To further reduce the length, the slow-wave structures [10,11] and the co-planar waveguide (CPW) [12,13] are proposed though the overall size is still relatively large. In recent years, the coupled transmission lines based resonator is extensively explored due to its compact size [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. It makes use implementing the transmission zeros at the required frequency.…”

Section: Introductionmentioning

confidence: 99%

Design of a Ka-Band U-Shaped Bandpass Filter with 20-GHz Bandwidth in 0.13-μm BiCMOS Technology

2020

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In this work, the design of a novel Ka-band miniaturized bandpass filter with broad bandwidth is demonstrated by using inversely coupled U-shaped transmission lines. In the proposed filter, two transmission zeros can be generated within a cascaded U-shaped structure and it can also be proven that, by inversely coupling two stacked U-shaped transmission lines, the notch frequency at the upper stopband can be shifted to a lower frequency, which results in a smaller chip size. The key parameters affecting the performance of the proposed filter are investigated in detail with the effective lumped-element circuit illustrated. Fabricated in a 0.13-μm SiGe BiCMOS process, the proposed filter achieves an insertion loss of 3.6 dB at a frequency of 28.75 GHz and the measured bandwidth is from 20.75 GHz to 41 GHz. The return loss is better than −10 dB from 20.5 GHz to 39 GHz. The lower transmission zero is located at 11.75 GHz with a suppression of 54 dB while the upper transmission zero is around 67 GHz with an attenuation of 34.6 dB. The measurement agrees very well with the simulation results and the overall chip size of the proposed filter is 176 × 269 μm2.

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“…Recently, the integrated passive devices (IPD) technology is widely used to design the passive components with compact sizes and high performances. Specifically, BPFs based on IPD technology are proposed with relatively narrow bandwidth using meandered coupled lines 10,11 . Thus, the main challenges for designing UWB BPFs are to obtain low insertion loss, high stopband attenuation and small component size simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Compact and low insertion loss UWB on‐chip bandpass filter using coupled meandered line

Jiang

Tang

Shi

et al. 2020

Micro & Optical Tech Letters

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For ultra-wideband (UWB) communication applications, a low-loss compact filter is proposed based on coupled lines using the GaAs integrated passive devices (IPD) technology in this letter. The multistage coupling lines are used to realize the ultra-wide passband with 100% fractional bandwidth. Two modified stubs loaded with shorted capacitors are introduced between coupled lines to produce a new transmission zero near the lower passband edge, resulting in better frequency selectivity performance. Moreover, stepped impedance resonator (SIR) structure is applied to the coupled lines to improve impedance matching performance within ultra-wide passband. As demonstrated, the proposed filter is fabricated as a chip with a compact size of 1.8 × 1.7 mm 2 , that is, 0.257 × 0.242 λ g 2 . The measured results show that the insertion loss of the filter is less than 1.5 dB from 6 to 18 GHz with the return loss better than 13.5 dB. All simulated and measured frequency responses of the proposed filter are found to match well with each other, which further demonstrates the claimed superior performances of the proposed filter. K E Y W O R D S bandpass filter, coupled line, integrated passive devices technology, ultra-wideband 1 | INTRODUCTIONRecently, the ultra-wideband (UWB) bandpass filter (BPF), as a key passive component in UWB communication systems, has attracted much attention. Over the past few years, many researches in this area have been reported. Among them, UWB BPFs are mostly based on the multimode resonator (MMR) concept 1 and have obtained excellent performances. However, the size of these UWB BPFs is too large, which limits their practical application in the modern compact UWB communication systems. 2 Meanwhile, the rejection level of the stop bands of the MMR UWB BPF is not as deep as desired. 3 Thus, the miniature and high selectivity of UWB BPFs are in high demand.Coupled lines are well-known elements in the design of the passive components for RF and microwave applications. Many passive components, including filter, coupler, balun, and power divider, are designed and fabricated based on coupled lines using PCB technology. [4][5][6][7] For BPFs based on coupled lines, their working bandwidths are usually limited, and the fractional bandwidths of these filters are narrow and less than 25%. 8,9 Besides, the performances of these BPFs will be deteriorated due to the PCB fabrication precision. Recently, the integrated passive devices (IPD) technology is widely used to design the passive components with compact sizes and high performances. Specifically, BPFs based on IPD technology are proposed with relatively narrow bandwidth using meandered coupled lines. 10,11 Thus, the main challenges for designing UWB BPFs are to obtain low

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A Compact and Low-Loss Bandpass Filter Using Self-Coupled Folded-Line Resonator With Capacitive Feeding Technique

Cited by 36 publications

References 11 publications

On Computationally-Efficient Reference Design Acquisition for Reduced-Cost Constrained Modeling and Re-Design of Compact Microwave Passives

On Computationally-Efficient Reference Design Acquisition for Reduced-Cost Constrained Modeling and Re-Design of Compact Microwave Passives

Design of a Ka-Band U-Shaped Bandpass Filter with 20-GHz Bandwidth in 0.13-μm BiCMOS Technology

Compact and low insertion loss UWB on‐chip bandpass filter using coupled meandered line

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