A Miniaturized Wideband Bandpass Filter Using Quarter-Wavelength Stepped-Impedance Resonators

Liu, Liqin; Zhang, Ping; Weng, Min‐Hang; Tsai, Chung‐Ying; Yang, Ru‐Yuan

doi:10.3390/electronics8121540

Cited by 13 publications

(9 citation statements)

References 18 publications

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“…The impedances of the coupled lines are calculated by the conventional method as described in Eqs. ( 2)- (12). When the coupling coefficient of a particular resonant mode was zero, the resonator could not allow the field to the next one and hence, they were not excited.…”

Section: Proposed Stub Loaded Stepped Impedance With Parallel Coupled...mentioning

confidence: 99%

“…Single-band and dual-band bandpass filter designs are obtained using a multi-mode Substrate Integrated Waveguide (SIW) circular cavity resonator [11]. A miniaturized quarter-wavelength stepped impedance resonators were directly coupled for wideband achievement in [12]. A wideband bandpass filter with three coupled line cross-shaped structures is used for realizing the strong coupling in [13].…”

Section: Introductionmentioning

confidence: 99%

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Capacitive Coupled Wide-Notch Stepped Impedance Narrow-Band Bandpass Filter for WiMax Application

Kayalvizhi¹,

Malliga²

2022

Computer Systems Science and Engineering

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The development of wireless communication standards necessitates optimal filter design for the selection of appropriate bands of frequencies. In this work, a compact in size pair of parallel coupled symmetric stepped impedancebased resonator is designed with supporting to the WiMAX communication standards. The coupled resonator is tuned to allow the frequency band between 3.4 GHz and 3.8 GHz, which is centered at 3.6 GHz. A parasitic effect of capacitively coupled feed structure is used for exciting the two symmetrical stepped impedance resonators. The bandwidth and selectivity of the filter are enhanced with the change of characteristic impedances and controlling the coupling gap between resonators. This design offers single narrow sharp passband selectivity as well as multiple stopband harmonic suppression arising as a result of multiple transmission zeros. The designed filter operates with a fractional bandwidth (FBW) of 11.47%. The proposed single narrowband bandpass filter provides better suppression in either side of the tuned frequency (3.6 GHz) without degrading the passband performance. Also, this novel filter offers an insertion loss of about −0.08 dB and a return loss of greater than −30 dB in passband. This approach is useful for eliminating unwanted spurious harmonics responses that enter the desired response. The suggested bandpass filter has been simulated using Advanced Design System (ADS) tool, and the measurement has been made using a network analyzer, and the results are reported.

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Section: Proposed Stub Loaded Stepped Impedance With Parallel Coupled...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capacitive Coupled Wide-Notch Stepped Impedance Narrow-Band Bandpass Filter for WiMax Application

Kayalvizhi¹,

Malliga²

2022

Computer Systems Science and Engineering

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show abstract

“…To overcome the problems of large size and high loss of silicon-based filters, this paper proposes a filter structure with a double-layer silicon substrate and stepped impedance resonators (SIRs) [ 18 , 19 , 20 ]. As shown in Figure 1 , this structure is similar to substrate integrated waveguide (SIW) [ 21 ], the double-layer high resistance silicon substrate, and surrounding TSV metalized vias enclosing the transmission line.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of an S-Band MEMS Bandpass Filter Based on Aggressive Space Mapping

Gao

Shi

et al. 2022

Micromachines

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Aggressive space mapping (ASM) is a common filter simulation and debugging method. It plays an important role in the field of microwave device design. This paper introduces ASM and presents the design and fabrication of a compact fifth-order microstrip interdigital filter with a center frequency of 2.5 GHz and a relative bandwidth of 10% using ASM. The filter used a double-layer silicon substrate structure and stepped impedance resonators (SIRs) and was optimized by ASM. After five iterations, the filter achieved the design specification, which greatly improves the efficiency of the filter design compared with the traditional method. It was fabricated on high-resistance silicon wafers by micro-electro-mechanical systems (MEMSs) technology, and the final size of the chip is 9.5 mm × 7.6 mm × 0.8 mm. The measurement results show that the characteristics of the filter are similar to the simulation results, which also shows the efficiency and precision of the ASM algorithm.

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“…There is an immense amount of research carried out to achieve TZs in a small area. The conventional method is to use transmission lines based resonators such as stub-loaded resonators [1,2] or stepped-impedance resonators [3][4][5] at the cost of large areas. In [6][7][8][9], the folded micro-strip lines are utilized, which bend the overall length in a small area to form the resonators.…”

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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A Miniaturized Wideband Bandpass Filter Using Quarter-Wavelength Stepped-Impedance Resonators

Cited by 13 publications

References 18 publications

Capacitive Coupled Wide-Notch Stepped Impedance Narrow-Band Bandpass Filter for WiMax Application

Capacitive Coupled Wide-Notch Stepped Impedance Narrow-Band Bandpass Filter for WiMax Application

Design and Optimization of an S-Band MEMS Bandpass Filter Based on Aggressive Space Mapping

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

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