High-Temperature Superconducting Multimode Dual-Ring UWB Bandpass Filter

Long, Zhihe; Tian, Mingen; Zhang, Tianliang; Qiao, Man; Wu, Tianhai; Lan, You‐Zhao

doi:10.1109/tasc.2019.2951745

Cited by 21 publications

(11 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Compared to the cited References 1‐11 the proposed filter has a significantly sharper selectivity, comparable passband insertion‐loss, and a significantly wider stopband. In particular, the selectivity factor of the proposed filter of 93% is much better than that obtained with the high‐temperature superconductor bandpass filter whose selectivity is 87.9% 11 . Although the proposed filter exhibits a return‐loss that is better than 20 dB compared 15.2 by the HTS filter, however, its insertion‐loss of 1.42 dB is higher than 0.42 dB by the HTS filter.…”

Section: Wideband Microstrip Bandpass Filter Fabrication and Resultsmentioning

confidence: 99%

High selectivity wideband BPF with very wide stopband characteristic

Riaz¹,

Virdee

Alibakhshikenari

et al. 2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

This paper describes the design and evaluation of a highly selective wideband microstrip bandpass filter with a near brick‐shaped transmission response and a very wide stopband characteristic. The proposed filter structure excites multimode resonances that combine to realize a wideband filter response and excited too are transmission zeros that create a highly selective filter with wideband suppression in the upper and lower stopbands. The filter configuration comprises electromagnetically coupled resonators that are stub loaded. The input and output feedlines are interdigitally coupled to the resonators. Measured results confirm the low‐loss and via‐free wideband filter exhibits an elliptical response with a wide stopband with a rejection greater than 30 dB. The selectivity factor and stopband performance of the proposed filter is better than that obtained with the high‐temperature superconductor (HTS) filters. Design of the filter is relatively simple and easy to manufacture using standard PCB technology. There is good correlation between the simulation and measured results. The proposed wideband bandpass filter is suitable for applications in high interference environments and cognitive radio systems.

show abstract

Section: Wideband Microstrip Bandpass Filter Fabrication and Resultsmentioning

confidence: 99%

High selectivity wideband BPF with very wide stopband characteristic

Riaz¹,

Virdee

Alibakhshikenari

et al. 2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

show abstract

“…Numerous studies report on applications of superconducting resonators, either as filters, modulators, or as a vehicle for material characterization [14][15][16][17][18][19][20][21][22][23][24][25][26]. Electrical parameters, such as input impedance, attenuation, and quality factor, were derived using a Transmission Line (TL) resonator, implemented as quarter-wavelength (λ/4) Micro Strip (MS) line resonator, and loaded by a short circuit.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

et al. 2021

View full text Add to dashboard Cite

A new measurement technique of electrical parameters of superconducting thin films at the Very High Frequency (VHF) range is described, based on resonators with microstrip (MS) structures. The design of an optimal resonator was achieved, based on a thorough theoretical analysis, which is required for derivation of the exact configuration of the MS. A theoretical model is presented, from which an expression for the attenuation of a MS line can be derived. Accordingly, simulations were performed, and an optimal resonator for the VHF range was designed and implemented. Production constraints of YBa2Cu3O7 (YBCO) limited the diameter of the sapphire substrate to 3″. Therefore, a meander configuration was formed to fit the long λ/4 MS line on the wafer. By measuring the complex input reflection coefficients of a λ/4 resonator, we extracted the quality factor, which is mainly affected by the dielectric and conductor attenuations. The experimental results are well fitted by the theoretical model. The dielectric attenuation was calculated using the quasi-static analysis of the MS line. An identical copper resonator was produced and measured to compare the properties of the YBCO resonator in reference to the copper one. A quality factor of ~6·105 was calculated for the YBCO resonator, three orders of magnitude larger than that of the copper resonator. The attenuation per unit length of the YBCO layer was smaller by more than five orders of magnitude than that of the copper.

show abstract

“…In Ref. 4, a quintuple-mode HTS UWB filter is realized by loading three pairs of open stubs on the dual-ring resonator. Multiple modes are generating to create the passband response by tweaking the electrical length and impedance ratio of the stepped-impedance lines.…”

Section: Introductionmentioning

confidence: 99%

Wide stopband single layerquasi‐elliptic ultra‐widebandbandpass filter

Riaz¹,

Virdee

Mariyanayagam

et al. 2021

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

This article presents the design of a microstrip ultra-wideband (UWB) bandpass filter that exhibits desirable characteristics of low-loss, high selectivity, wide stopband and high out-of-band rejection at room temperature. These characteristics are normally achieved with high temperature superconductor filters that require cryogenic cooling. The design of the proposed filter was realized by exciting multiple resonant modes in a unique Z-shaped microstrip resonator. The admittance of the filter configuration can be tuned prior to fabrication to adjust its center frequency by about 11.5% without affecting the profile of the bandpass response however this can have an impact of the loss. The proposed configuration allows adjustment of the upper and lower transmission zeros defining the bandpass response by 20.5% and 11.4%, respectively, without degrading the overall filter response. The low-loss quasi-elliptic function UWB bandpass filter design was fabricated on a commercially available dielectric substrate using standard PCB technology and its performance verified. The fabricated filter exhibits insertion-loss of 0.68 dB and return-loss better than 17 dB.

show abstract

High-Temperature Superconducting Multimode Dual-Ring UWB Bandpass Filter

Cited by 21 publications

References 9 publications

High selectivity wideband BPF with very wide stopband characteristic

High selectivity wideband BPF with very wide stopband characteristic

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

Wide stopband single layerquasi‐elliptic ultra‐widebandbandpass filter

Contact Info

Product

Resources

About