Article
Engineering, Electrical & Electronic
Shanshan Du, Qinghui Yang, Xinan Fan, Ming Wang, Huaiwu Zhang
Summary: This letter presents a compact and low-loss magnetically tunable bandpass filter, which utilizes a yttrium iron garnet/gadolinium gallium garnet film structure as the resonator and optimizes the design and geometrical parameters to enhance performance.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Physics, Applied
Shanshan Du, Qing-Hui Yang, Xinan Fan, Huaiwu Zhang
Summary: This paper presents a novel highly selective tunable filter with transmission zero. The filter structure is enhanced by adding YIG/GGG layers as bandstop units to achieve transmission zero. CST Studio Suite is used to simulate and optimize the filter parameters, allowing for simultaneous tuning of transmission zero and filter passband. The addition of transmission zero enhances filter selectivity and provides more flexibility in suppressing interfering signals and parasitic responses. This method presents an approach for designing wide tuning range filters with transmission zeros.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Yiyang Feng, Sudhanshu Tiwari, Sunil A. Bhave, Renyuan Wang
Summary: We have successfully designed, fabricated, and characterized a planar monolithic yttrium iron garnet (YIG) Chebyshev bandstop filter on gadolinium gallium garnet (GGG) substrate with tunable frequency, low insertion loss (IL), and high rejection. This filter is created using YIG micromachining technology that allows direct placement of metal transducers on YIG for strong spin-wave coupling. By applying different bias fields, the stopband center frequency is tuned from 4 to 8 GHz while maintaining more than 30-dB rejection. With proper design of a tunable compact electromagnet, this new filter design can attenuate spurs appearing across the fifth generation (5G) and X-band spectrum.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Shanshan Du, Qinghui Yang, Ming Wang, Xinan Fan
Summary: A new structure magnetically tunable bandpass filter with five stages was designed and realized in this article. The filter can tune the center frequency, improve out-of-band suppression, and adjust bandwidth using YIG/GGG/YIG film multi-layer structure and a metal rectangular ring.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Physics, Fluids & Plasmas
Guoqiang Wei, Qiuyue Nie, Zhonglin Zhang, Peiqi Chen, Changshi Yan
Summary: In this study, a double-stubs structure submerged in a gaseous discharge plasma medium was proposed to achieve tunable filtering properties in the GHz range. The experimental results showed that the height of the stubs had a significant impact on filtering performance.
PHYSICS OF PLASMAS
(2022)
Article
Engineering, Electrical & Electronic
Mohammad Abu Khater, Pintu Adhikari, Mattias Thorsell, Sten Gunnarsson, Brian Edward, Dimitrios Peroulis
Summary: The letter introduces a wideband bandpass filter (BPF) with a tunable and switchable in-band notch, which allows uninterrupted passage of the signal of interest and rejection of interfering signals. The BPF is based on a two-path architecture loaded with resonators, tuned with varactor diodes, and achieves an in-band notch tunable between 5 and 6.25 GHz. The implemented hardware operates in the 4.8-7.8-GHz frequency range with a measured insertion loss of 0.6 dB.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Instruments & Instrumentation
Ahmed A. Ibrahim, Wael A. E. Ali, Hesham A. Mohamed
Summary: In this work, a bandpass filter using split ring and open-loop resonators for wireless applications is discussed. The filter can achieve both bandpass and bandstop behaviors in different frequency ranges, and the operating mode of the filter can be changed by controlling embedded diodes. The experimental results validate the feasibility of the filter.
JOURNAL OF INSTRUMENTATION
(2022)
Article
Engineering, Electrical & Electronic
Xiaoying Zuo, Lei Qin
Summary: The proposed three-line coupled-line narrowband bandstop filter features very narrow band rejection, wide upper bandpass bandwidth, high selectivity, and is suitable for low-cost single-layer microstrip implementations.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Claudio Porzi, Manuel Reza, Paolo Ghelfi, Marc Sorel, Antonella Bogoni
Summary: We report a silicon photonics flat-top bandpass microwave photonic filter with large out-of-band power rejection of over 40 dB and tunability of central frequency up to 70 GHz. The RF bandpass transfer function can be widely configured without sacrificing filter performance. The filter integrates a phase modulator and a tunable optical splitter to achieve a high level of functional integration.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yaowen Xing, Zhengren Yan, Jinwu Wei, Caihua Wan, Wenlong Yang, Yizhou Liu, Chi Fang, Xiao Wang, Chenyang Guo, Xiaomin Zhang, Guoqiang Yu, Xiufeng Han
Summary: A phenomenon of Y3Fe5O12 (YIG)-ferromagnetic-resonance (FMR) linewidth broadening in magnetically coupled YIG-Co films is reported. The broadened linewidth is attributed to a new type of inhomogeneity effect induced by the inhomogeneous dipolar field of the Co layer. The extent of the linewidth broadening depends on the magnetization state of Co, and the influence of Co on YIG-FMR linewidth is a long-range effect due to the dipolar origin even when the spacer between YIG and Co is 315 nm.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Xiaoying Zuo, Lei Qin
Summary: A novel circuit configuration has been proposed to design a wideband bandstop filter with wide upper bandpass bandwidth. The measured results show good performance and agreement with full-wave simulation results.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Yifan Liu, Yu Chen, Lin Wang, Yu Yu, Yuan Yu, Xinliang Zhang
Summary: This paper presents a tunable and reconfigurable bandpass microwave photonic filter (MPF) using four cascaded silicon-on-insulator (SOI) microring resonators (MRRs). The center frequency and bandwidth of the filter can be adjusted by tuning the resonant wavelengths and coupling coefficients of the MRRs. The operation state of each MRR can be monitored for precise adjustment. Experimental results show that the filter maintains a high rejection ratio during the tuning process. This filter has potential applications in radar, sensor networks, and wireless communications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Abdulrahman Widaa, Chad Bartlett, Michael Hoeft
Summary: This article presents a new class of compact, high-Q, tunable coaxial filter based on a novel inset resonator concept. The filter design allows for wide tuning capabilities and stable high Q-factor performance. Various prototypes are designed and implemented to demonstrate the effectiveness of the proposed concept. The results show significant improvement in tuning range and volume-saving compared to conventional designs.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Computer Science, Interdisciplinary Applications
Amjad Iqbal, Amor Smida, Mohamed Waly, Nazih Khaddaj Mallat
Summary: This paper introduces the design of highly-tunable single-ended and balanced filters with improved upper stopband performance, utilizing a spurline and a U-shaped stepped impedance resonator (SIR) with a varactor diode. Both designs feature high tunable ranges, low insertion losses, and wide upper stopband performance, which are experimentally validated to cover most of the 5G wireless communication bands with different biasing voltages. Comparisons with state-of-the-art filters show that the proposed filters achieve high tunable ranges with low insertion losses and wide upper stopband performance.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Dimitra Psychogiou, Kunchen Zhao, Roberto Gomez-Garcia
Summary: This letter discusses the RF design and practical realization of dual-bandstop filters with compact size and two independently controlled rejection bands. The filters are based on miniaturized substrate-integrated-coaxial resonant stages and achieve further miniaturization by tuning the center frequency of the bands. Three prototypes were designed, manufactured, and measured to validate the concept.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
