The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform

Jia-sheng Hong - One of the best experts on this subject based on the ideXlab platform.

  • Wideband Bandstop Filter With Cross-Coupling
    IEEE Transactions on Microwave Theory and Techniques, 2007
    Co-Authors: Hussein Shaman, Jia-sheng Hong
    Abstract:

    A general circuit configuration for cross-coupled wideband bandstop filters is proposed. The distinct filtering characteristics of this new type of transmission line filter are investigated theoretically and experimentally. It is shown that a ripple Stopband can be created, leading to a quasi-elliptic function response that enhances the rejection bandwidth. A demonstrator with approximately 80% fractional bandwidth at a mid-Stopband Frequency of 4 GHz is developed and presented. The proposed filter is successfully realized in theory and verified by full-wave electromagnetic simulation and the experiment. Theoretical, simulated, and measured results are in excellent agreement.

Xiaopeng Shen - One of the best experts on this subject based on the ideXlab platform.

  • An Ultraminiaturized Dual-Stopband Frequency Selective Surface for Ultra High Frequency
    IEEE Access, 2020
    Co-Authors: Lei Zhao, Xinhua Liang, Zhao-min Chen, Yuan Li, Shengjun Zhang, Xiaopeng Shen
    Abstract:

    In this paper, an ultraminiaturized dual-Stopband Frequency selective surface (FSS) for ultra high Frequency (UHF) is investigated. The proposed FSS uses one dielectric layer with two different metal layers printed on its surfaces and the metal layers are composed of meandering lines and metal vias. It has an ultraminiaturized unit cell size of 0.021λ0 × 0.021λ0 (λ0 refers to the wavelength at first resonance Frequency) and produces two Stopbands centered at 0.75 GHz and 1.8 GHz, respectively. The simulated results exhibit great stability when the incident wave angle changes from 0° to 85° for both TE and TM polarization. Furthermore, it has a good controllability for both resonance frequencies. The miniaturization and stability of the proposed FSS is better than the other designs in the recent research, which may have potential applications for UHF. The accuracy equivalent circuit is derived for better explaining mechanism of the proposed FSS. Finally, a dual-Stopband FSS is fabricated and the measured results are much the same with simulated ones.

J. Bornemann - One of the best experts on this subject based on the ideXlab platform.

  • Design of multiple-Stopband filters for interference suppression in UWB applications
    IEEE Transactions on Microwave Theory and Techniques, 2006
    Co-Authors: K. Rambabu, M.y.-w. Chia, Khee Meng Chan, J. Bornemann
    Abstract:

    A design of multiple-Stopband filters is presented for the suppression of interfering signals in UWB applications. Since possible interferers can be located at fixed frequencies or within a defined Frequency band, the design of both fixed and tunable narrow Stopband filter sections is addressed. For multiple fixed Stopband filters, bent resonators, coupled to the main line, are introduced in order to more effectively suppress harmonics. A new tunable tapped Stopband section is proposed, which allows the simultaneous control of Stopband Frequency and bandwidth. The final multiple-Stopband design combines fixed and tunable sections and simultaneously suppresses interferences from global system for mobile communication, wireless local area network, worldwide interoperability for microwave access, and industrial-scientific-medical applications. Measurements verify the design process

M Z Azad - One of the best experts on this subject based on the ideXlab platform.

  • wideband smaller unit cell planar ebg structures and their application
    IEEE Transactions on Antennas and Propagation, 2008
    Co-Authors: M. F. Abedin, M Z Azad
    Abstract:

    A new low-cost smaller unit-cell planar electromagnetic bandgap (EBG) structure operating at the lower GHz frequencies (below 6 GHz) is proposed. EBG structures based on this new geometry are designed on a number of commonly available substrates. Characteristics of such structures, such as bandgap and reflection phase profile are analyzed. A simple empirical model is proposed to predict the surface wave Stopband Frequency of the proposed EBG structure. Finally, a low-profile dipole antenna is designed and tested for operation on the EBG structure.

Hussein Shaman - One of the best experts on this subject based on the ideXlab platform.

  • Wideband Bandstop Filter With Cross-Coupling
    IEEE Transactions on Microwave Theory and Techniques, 2007
    Co-Authors: Hussein Shaman, Jia-sheng Hong
    Abstract:

    A general circuit configuration for cross-coupled wideband bandstop filters is proposed. The distinct filtering characteristics of this new type of transmission line filter are investigated theoretically and experimentally. It is shown that a ripple Stopband can be created, leading to a quasi-elliptic function response that enhances the rejection bandwidth. A demonstrator with approximately 80% fractional bandwidth at a mid-Stopband Frequency of 4 GHz is developed and presented. The proposed filter is successfully realized in theory and verified by full-wave electromagnetic simulation and the experiment. Theoretical, simulated, and measured results are in excellent agreement.