An Ultra-Wideband Bandpass Filter with a Notch Band and Wide Upper Bandstop Performances

Weng, Min‐Hang; Hsu, Ching‐Wei; Lan, Siang-Wen; Yang, Ru‐Yuan

doi:10.3390/electronics8111316

Cited by 21 publications

(8 citation statements)

References 17 publications

(31 reference statements)

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“…The designed filter has acceptable filter responses as compared to other filters. Additionally, as compared to the previous works with a similar performance [15], Example 2 shows a miniaturized size and a simple configuration, without needing a defected ground area to destroy the ground plane. For both filter examples, the insertion loss and return loss are both satisfactory from the measurement data.…”

Section: A Dual Wideband Filter With a Notched Stopbandmentioning

confidence: 92%

“…In [14], a pair of open-circuited stubs and three pairs of coupled-line sections were used to produce a UWB BPF. In [15], a UWB BPF with a notched band and a wide upper stopband was realized by using two pairs of half-wavelength, high impedance line resonators. However, the bandwidth is controlled by the coupling gap and thus large bandwidth would be limited due to the requirement of the precious fabricated technology.…”

Section: Related Workmentioning

confidence: 99%

“…At present, most of the research and applications of the BPF still focus on the broadband and multi-band design [1,2]. In the past, several resonator structures have been proposed to achieve the wideband filter design, such as the use of the step impedance resonator (SIR) [3,4], defect ground structure (DGS) [5], multi-layer structure [6], multi-mode (MMR) [7][8][9], stub-loaded resonator (SLR) [10][11][12][13], coupled-line [14,15], multiple-mode split-ring resonators (SRR) [16,17], and so on.…”

Section: Introductionmentioning

confidence: 99%

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Application of a Stub-Loaded Square Ring Resonator for Wideband Bandpass Filter Design

et al. 2020

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In this paper, a stub-loaded square ring resonator (SLSRR) is analyzed and applied to design a very simple and compact wideband bandpass filter structure. Resonant modes dependent on the structure parameters of the SLSRR are analyzed first, and then the first two modes are used to achieve a required passband. The input and output terminals are supplied with high impedance and strong coupling to provide sufficient coupling energy. Two wideband filter examples are designed, manufactured, and measured using the SLSRRs. The first filter is a wideband filter with a wide upper stopband, and the second filter is a dual wideband filter with a notched stopband between two passbands. The two filter examples are designed, fabricated, and measured to verify the design concept and present the advantages of easy design and a simple and compact structure.

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Section: A Dual Wideband Filter With a Notched Stopbandmentioning

confidence: 92%

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of a Stub-Loaded Square Ring Resonator for Wideband Bandpass Filter Design

et al. 2020

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“…In [6,7], a UWB BPF with a wide stopband was proposed by using defected ground structure (DGS). In [8,9], parallel coupled lines were developed to have wideband filter responses with high selectivity. In [10], transmission lines implemented on metamaterial-inspired co-planar waveguide (CPW) balanced cells were utilized to obtain wideband performance.…”

Section: Introductionmentioning

confidence: 99%

Compact Ultra-Wideband Bandpass Filters Achieved by Using a Stub-Loaded Stepped Impedance Resonator

et al. 2020

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In this paper, we develop a bandpass filter using a stub-loaded stepped impedance resonator (SLSIR) and calculate the even and odd resonant modes of this type of resonator using the input impedance/admittance analysis. In this study, two impedance ratios and two length ratios are operated as the design parameters for controlling the resonant modes of the SLSIR. Several resonant mode variation curves operating three resonant modes with different impedance ratios and two length ratios are developed. By tuning the desired impedance ratios and length ratios of the SLSIRs, compact ultra-wideband (UWB) bandpass filters (BPFs) can be achieved. Two examples of the UWB BPFs are designed in this study. The first example is UWB filter with a wide stopband and the second one is dual UWB BPF, namely, with UWB performance and a notch band. The first filter is designed for a UWB response from 3.1 to 5.26 GHz having a stopband from 5.3 to 11 GHz, with an attenuation level better than 18 dB. The second filter example is a dual UWB BPF with the frequency range from 3.1 to 5 GHz and 6 to 10.1 GHz using two sets of the proposed SLSIR. The measured results have insertion loss of less than 1 dB, and return loss greater than 10 dB. Furthermore, the coupling structures and open stub of the SLSIR also provide several transmission zeros at the skirt of the passbands for improving the passband selectivity.

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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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An Ultra-Wideband Bandpass Filter with a Notch Band and Wide Upper Bandstop Performances

Cited by 21 publications

References 17 publications

Application of a Stub-Loaded Square Ring Resonator for Wideband Bandpass Filter Design

Application of a Stub-Loaded Square Ring Resonator for Wideband Bandpass Filter Design

Compact Ultra-Wideband Bandpass Filters Achieved by Using a Stub-Loaded Stepped Impedance Resonator

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

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