The Experts below are selected from a list of 10521 Experts worldwide ranked by ideXlab platform

Yi-lung Wu - One of the best experts on this subject based on the ideXlab platform.

  • Periodic Synthesized Transmission Lines With 2-D Routing Capability and Its Applications to Power Divider and Couplers Using Integrated Passive Device Process
    IEEE Transactions on Microwave Theory and Techniques, 2016
    Co-Authors: Yi-lung Wu
    Abstract:

    A novel periodic synthesized transmission line, comprising periodic unit cells and specially treated corner cells, is proposed and realized using integrated Passive Device technology. The key innovation is the square unit cell, formed by an asteriated strip overlapped with a capacitive pad. It enables 2-D layout routing since any two of the four arms of the unit cell can serve as the input/output ports. To account for the discontinuity effect at bends, the corner cells are developed independently as a pure lumped T-network to reduce the undesired signal reflection at junctions. Quarter-wavelength synthesized lines are jointed together as miniaturized on-chip couplers. The experimental results demonstrate the compactness of the on-chip components, in addition to their good electrical responses. The uniqueness of the design concept is clearly validated.

Yusheng Ji - One of the best experts on this subject based on the ideXlab platform.

  • accurate location tracking from csi based Passive Device free probabilistic fingerprinting
    IEEE Transactions on Vehicular Technology, 2018
    Co-Authors: Stephan Sigg, Lin Chen, Yusheng Ji
    Abstract:

    The research on indoor localization has received great interest in recent years. This has been fueled by the ubiquitous distribution of electronic Devices equipped with a radio frequency (RF) interface. Analyzing the signal fluctuation on the RF-interface can, for instance, solve the still open issue of ubiquitous reliable indoor localization and tracking. Device bound and Device free approaches with remarkable accuracy have been reported recently. In this paper, we present an accurate Device-free Passive (DfP) indoor location tracking system that adopts channel state information (CSI) readings from off-the-shelf WiFi 802.11n wireless cards. The fine-grained subchannel measurements for multiple input multiple output orthogonal frequency-division multiplexing PHY layer parameters are exploited to improve localization and tracking accuracy. To enable precise positioning in the presence of heavy multipath effects in cluttered indoor scenarios, we experimentally validate the unpredictability of CSI measurements and suggest a probabilistic fingerprint-based technique as an accurate solution. Our scheme further boosts the localization efficiency by using principal component analysis to filter the most relevant feature vectors. Furthermore, with Bayesian filtering, we continuously track the trajectory of a moving subject. We have evaluated the performance of our system in four indoor environments and compared it with state-of-the-art indoor localization schemes. Our experimental results demonstrate that this complex channel information enables more accurate localization of nonequipped individuals.

  • Probabilistic fingerprinting based Passive Device-free localization from channel state information
    IEEE Vehicular Technology Conference, 2016
    Co-Authors: Shuyu Shi, Stephan Sigg, Yusheng Ji
    Abstract:

    Given the ubiquitous distribution of electronic Devices equipped with a radio frequency (RF) interface, researchers have shown great interest in analyzing signal fluctuation on this interface for environmental perception. A popular example is the enabling of indoor localization with RF signals. As an alternative to active Device-based positioning, Device-free Passive (DfP) indoor localization has the advantage that the sensed individuals do not require to carry RF sensors. We propose a probabilistic fingerprinting-based technique for DfP indoor localization. Our system adopts CSI readings derived from off-the-shelf WiFi 802.11n wireless cards which can provide fine-grained subchannel measurements in the context of MIMO-OFDM PHY layer parameters. This complex channel information enables accurate localization of non-equipped individuals. Our scheme further boosts the localization efficiency by using principal component analysis (PCA) to identify the most relevant feature vectors. The experimental results demonstrate that our system can achieve an accuracy of over 92% and an error distance smaller than 0.5m. We also investigate the effect of other parameters on the performance of our system, including packet transmission rate, the number of links as well as the number of principle components.

Cong Wang - One of the best experts on this subject based on the ideXlab platform.

  • Ultraminiaturized Wideband Quasi-Chebyshev/-Elliptic Impedance-Transforming Power Divider Based on Integrated Passive Device Technology
    IEEE Transactions on Plasma Science, 2020
    Co-Authors: Mengdan Kong, Yongle Wu, Zheng Zhuang, Weimin Wang, Cong Wang
    Abstract:

    This article presents the ultraminiaturized wideband quasi-Chebyshev and -elliptic low-pass power dividers (PDs) with an impedance-transforming function using integrated Passive Device (IPD) technology, occupying only the sizes of 1.1 × 1.2 mm2 and 1.1 × 1.6 mm2, respectively. The generalized quasi-Chebyshev low-pass matching network with the detailed design procedure is utilized to construct the circuit schematic of the proposed wideband PD. In order to further improve stopband rejection, a quasi-elliptic network is introduced, resulting in an extra transmission zero (TZ). For demonstration, the quasi-Chebyshev and -elliptic PDs based on IPD technology are designed, manufactured, and measured, respectively. Measurements indicate that the quasi-elliptic PD with TZ shows good electrical responses, including lower than 1.08-dB insertion loss, all better than 15-dB return loss and isolation from 2.49 to 5.0 GHz.

  • Design Analysis of Integrated Passive Device-Based Balun Devices With High Selectivity for Mobile Application
    IEEE Access, 2019
    Co-Authors: Alok Kumar, Cong Wang, Fan-yi Meng, Kishor Kumar Adhikari, Tian Qiang, Qun Wu, Yongle Wu
    Abstract:

    This paper presents highly selective, low-loss, and miniaturized balun Devices fabricated using the integrated Passive Device (IPD) technique for the GSM band (900/1800 MHz) and the WiFi band (2400 MHz) in mobile applications. Balun Devices were fabricated on a gallium arsenide (GaAs) substrate using the IPD fabrication process to reduce the overall size (0.05λg × 0.036λg at 900 MHz). Each Device is the combination of lattice lumped structure with a low-pass filter and a high-pass filter configuration. This structural formation of lumped elements helps to reduce the phase mismatch error in the balun Devices. For all the balun Devices, the measured results indicated a minimum amplitude imbalance (

  • Integrated Passive Device fabricated and chip-on-board packaged filter employing mixed electric–magnetic coupling scheme
    IET Microwaves Antennas & Propagation, 2018
    Co-Authors: Jun-ge Liang, Cong Wang
    Abstract:

    Compact and high-performance radio-frequency Devices require several optimisation processes in the design, fabrication, and packaging, as well as a thorough reliability verification. The authors propose a compact planar dual-band bandpass filter comprising mixed electric-magnetic coupling open-loop resonators. To increase the coupling performance and minimise the structure size, the resonators were topologically optimised into both external stepped-impedance resonators and internal half-wavelength spiral resonators. Besides the electric length of the resonators, the centre frequencies and transmission zeros were tuned to the desired values by controlling the coupling coefficients and quality factors. Moreover, in their design, the in-band flatness and bandwidth can also be adjusted. To validate their approach, they fabricated a filter on a gallium arsenide substrate using the advanced-integrated Passive Device process. Then, the filter was packaged by attaching it to a printed circuit board using a chip-on-board technique. The measurement results were consistent with those obtained from a simulation. A series of tests verified that the utilised fabrication and packaging techniques notably enhance the Device reliability and its long-term stability even in harsh environments.

  • Introduction to Integrated Passive Device Technology
    2016
    Co-Authors: Cong Wang, Yang Li
    Abstract:

    This book provides a practical introduction of integrated Passive Device (IPD) technology for both undergraduate and graduate students of electronic engineering, electrical engineering, practicing engineers, communication engineering, and other interested students and researchers. There is no need to justify the existence of IPDs; they are the essential building blocks of mobile and wireless communication systems. IPDs play an important role in the front-end RF sections of mobile phones, and have been developed to meet the ever increasing needs of size and cost reduction in microwave applications. The purpose of this book is to provide a practical overview of this integrated Passive technology, potential applications, motivations, and the problems associated with IPDs, and to learn the practical design and fabrication methods of IPDs.

  • a reusable robust radio frequency biosensor using microwave resonator by integrated Passive Device technology for quantitative detection of glucose level
    Biosensors and Bioelectronics, 2015
    Co-Authors: Rajendra Dhakal, Kishor Kumar Adhikari, Cong Wang
    Abstract:

    Abstract A reusable robust radio frequency (RF) biosensor with a rectangular meandered line (RML) resonator on a gallium arsenide substrate by integrated Passive Device (IPD) technology was designed, fabricated and tested to enable the real-time identification of the glucose level in human serum. The air-bridge structure fabricated by an IPD technology was applied to the RML resonator to improve its sensitivity by increasing the magnitude of the return loss ( S 21 ). The resonance behaviour, based on S 21 characteristics of the biosensor, was analysed at 9.20 GHz with human serum containing different glucose concentration ranging from 148–268 mg dl −1 , 105–225 mg dl −1 and at a deionised ( D ) water glucose concentration in the range of 25– 500 mg dl −1 for seven different samples. A calibration analysis was performed for the human serum from two different subjects and for d -glucose at a response time of 60 s; the reproducibility, the minimum shift in resonance frequency and the long-term stability of the signal were investigated. The feature characteristics based on the resonance concept after the use of serum as an analyte are modelled as an inductor, capacitor and resistor. The findings support the development of resonance-based sensing with an excellent sensitivity of 1.08 MHz per 1 mg dl −1 , a detection limit of 8.01 mg dl −1 , and a limit of quantisation of 24.30 mg dl −1 .

Mina Raiszadeh - One of the best experts on this subject based on the ideXlab platform.

  • miniaturized uwb filters integrated with tunable notch filters using a silicon based integrated Passive Device technology
    IEEE Transactions on Microwave Theory and Techniques, 2012
    Co-Authors: Zhengzheng Wu, Yonghyun Shim, Mina Raiszadeh
    Abstract:

    This paper reports on the implementation of miniaturized ultra-wideband filters integrated with tunable notch filters using a silicon-based integrated Passive Device technology. An ultra-wideband bandpass filter is realized on a micromachined silicon substrate, showing an insertion loss of 1.1 dB, return loss of better than 15 dB, and attenuation of more than 30 dB at both lower and upper stop-bands, with a spurious-free response up to 40 GHz. The filter occupies only 2.9 mm 2.4 mm of die area. To address the in-band interference issues associated with ultra-wideband communication, very compact tunable notch filters are monolithically integrated with the bandpass filters. A two-pole tunable notch filter integrated with an ultra-wideband filter provides more than 20 dB rejection in the 5-6 GHz range to reject U-NII interferences, with a total footprint of 4.8 mm 2.9 mm. The power handling, linearity, and temperature stability of filters are characterized and presented in this paper.

Robert C. Frye - One of the best experts on this subject based on the ideXlab platform.

  • High rejection BPF for WiMAX applications from Silicon Integrated Passive Device technology
    2010 IEEE MTT-S International Microwave Symposium, 2010
    Co-Authors: Robert C. Frye
    Abstract:

    We have developed a balanced band-pass filter using Silicon Integrated Passive Device (IPD) technology. The size of the filter is 2.0 × 1.3 × 0.4 mm3, which is by far the smallest filter achieving similar characteristics, to the best of our knowledge. A hybrid EM-circuit optimization scheme has been adopted for the design. Prototypes are made and measured. Good agreement has been achieved between simulated results and probed data. The measured insertion loss is 2.3 dB, the attenuation at 2.1 GHz is 24 dB minimum, and the attenuations at 2nd and 3rd harmonics are better than 35 dB. This small form-factor WiMAX filter is well suited for SiP applications to replace discrete filters, or to save large areas used to implement such filtering functions on boards.

  • Miniaturized ultra-wideband band-pass-filter from Silicon Integrated Passive Device technology
    2009 IEEE MTT-S International Microwave Symposium Digest, 2009
    Co-Authors: Robert C. Frye, Roger Emigh
    Abstract:

    In front-end modules of UWB applications, there are BPFs used to make the applications complying with the FCC's spectrum mask regulations at the transmitter paths, and to improve signal selectivity and receiving sensitivity at the receiver paths. Most of the UWB filtes in the applications now are made on printed circuit boards (PCBs) or using LTCC technology. We have developed a miniaturized UWB band-pass-filter using Silicon Integrated Passive Device (IPD) technology. The size of the filter is 1.6 times 1.2 times 0.4 mm3, which is by far the smallest UWB filter achieving similar functions, to the best of our knowledge. A hybrid EM-circuit optimization scheme has been adopted for the design. Prototypes are made and measured. Good agreement has been achieved between designed results and probed data. This small form-factor UWB filter may be well used in SiP applications to reduce discrete filters, or to save large board areas used to implement such filtering functions.

  • Design of compact power divider using integrated Passive Device (IPD) technology
    2009 59th Electronic Components and Technology Conference, 2009
    Co-Authors: Robert C. Frye
    Abstract:

    An integrated Passive Device (IPD) technology has been developed to achieve lower cost, further miniaturization and higher performance radio frequency (RF) Devices for wireless communication system applications. This paper describes a compact power divider suitable for wireless system application using integrated Passive Device (IPD) technology based on silicon substrate. The 2-way power divider of wire bond and flip chip type were realized by thin film IPD technology. Electromagnetic (EM) simulation was used to optimize individual inductor design to improve its quality factor. The fabricated IPD 2-way power divider has insertion loss of < 0.4 dB, return loss of >15 dB and isolation characteristic of > 20dB for 801.11a band (4900 MHz-5900 MHz) and their dimensions are 1.2 mm times 1.0 mm for wire bond version and 1.2 mm times 1.2 mm for flip chip version, respectively. These compact power dividers can be used for a variety of applications in RF and microwave areas.

  • Design of compact power divider using integrated Passive Device (IPD) technology
    2009 59th Electronic Components and Technology Conference, 2009
    Co-Authors: Robert C. Frye
    Abstract:

    An integrated Passive Device (IPD) technology has been developed to achieve lower cost, further miniaturization and higher performance radio frequency (RF) Devices for wireless communication system applications. This paper describes a compact power divider suitable for wireless system application using integrated Passive Device (IPD) technology based on silicon substrate. The 2-way power divider of wire bond and flip chip type were realized by thin film IPD technology. Electromagnetic (EM) simulation was used to optimize individual inductor design to improve its quality factor. The fabricated IPD 2-way power divider has insertion loss of ≪ 0.4dB, return loss of ≫15dB and isolation characteristic of ≫ 20dB for 801.11a band (4900MHz–5900MHz) and their dimensions are 1.2mm × 1.0mm for wire bond version and 1.2mm × 1.2mm for flip chip version, respectively. These compact power dividers can be used for a variety of applications in RF and microwave areas.

  • Full-Circuit Design Optimization of a RF Silicon Integrated Passive Device
    2006 IEEE Electrical Performane of Electronic Packaging, 2006
    Co-Authors: Robert C. Frye
    Abstract:

    A schematic-electromagnetic (EM) hybrid optimization scheme was used to design an integrated Passive Device (IPD)-diplexer. The method uses component values derived from circuit simulation and optimization to determine physical design changes. The diplexer was fabricated in a silicon wafer process. The small form-factor (2.6 times 1.3 times 0.25 mm3) of this Device makes it very attractive for system in package (SiP) applications. Simulated and measured results show good agreement