The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform

Jongchul Park - One of the best experts on this subject based on the ideXlab platform.

  • dms harmonic Termination Load network for high efficiency power amplifier applications
    European Microwave Conference, 2010
    Co-Authors: Girdhari Chaudhary, Yongchae Jeong, Jongsik Lim, Chul Dong Kim, Dongsu Kim, Junchul Kim, Jongchul Park
    Abstract:

    In this paper, a harmonic Termination Load network using a defected microstrip structure (DMS) for a high efficiency power amplifier is proposed and compared with a dumb-bell shaped defected ground structure (DGS) harmonic Termination Load network. The proposed structure is designed for a wideband code division multiple access (WCMDA) down-link applications operating at frequency of 2.11∼2.17 GHz. From the experiment, the attenuation of the DMS for the harmonic frequency (4.22∼6.51 GHz) is more than 27 dB. Comparing the defected area, the DMS occupies a quarter of the DGS defected area. The DMS has caused less electromagnetic interference (EMI) noise than the DGS due to no defected area in a ground plane. The ground problem of DGS can be overcome by using DMS.

Hirofumi Akagi - One of the best experts on this subject based on the ideXlab platform.

  • the state of the art of active filters for power conditioning
    European Conference on Power Electronics and Applications, 2005
    Co-Authors: Hirofumi Akagi
    Abstract:

    Unlike traditional passive filters, active filters for power conditioning have multiple functions such as harmonic filtering/damping/isolation/Termination, Load balancing, reactive-power control for power factor correction and voltage regulation, voltage-flicker reduction, or their combinations. Significant cost reductions in both power semiconductor devices and signal-processing devices have inspired many manufactures in Japan, Europe and the United States to put active filters on the market. This paper deals with active filters for power conditioning, and specifically hybrid active filters for harmonic filtering of three-phase diode rectifiers

Girdhari Chaudhary - One of the best experts on this subject based on the ideXlab platform.

  • dms harmonic Termination Load network for high efficiency power amplifier applications
    European Microwave Conference, 2010
    Co-Authors: Girdhari Chaudhary, Yongchae Jeong, Jongsik Lim, Chul Dong Kim, Dongsu Kim, Junchul Kim, Jongchul Park
    Abstract:

    In this paper, a harmonic Termination Load network using a defected microstrip structure (DMS) for a high efficiency power amplifier is proposed and compared with a dumb-bell shaped defected ground structure (DGS) harmonic Termination Load network. The proposed structure is designed for a wideband code division multiple access (WCMDA) down-link applications operating at frequency of 2.11∼2.17 GHz. From the experiment, the attenuation of the DMS for the harmonic frequency (4.22∼6.51 GHz) is more than 27 dB. Comparing the defected area, the DMS occupies a quarter of the DGS defected area. The DMS has caused less electromagnetic interference (EMI) noise than the DGS due to no defected area in a ground plane. The ground problem of DGS can be overcome by using DMS.

M B Steer - One of the best experts on this subject based on the ideXlab platform.

  • a novel envelope Termination Load pull method for acpr optimization of rf microwave power amplifiers
    International Microwave Symposium, 1998
    Co-Authors: John F Sevic, K L Burger, M B Steer
    Abstract:

    A novel Load-pull method for envelope-Termination characterization is presented. The method enables the source and Load envelope Terminations to be easily evaluated to further optimize the linearity/efficiency tradeoff of RF/microwave power transistors used in digital wireless communication systems with time-varying envelopes. Results are presented for a 53 mm low-voltage LDMOS transistor at 850 MHz. It is shown that the optimal envelope Termination may in general be complex, in contrast to the commonly held belief that the envelope-Termination must be approximately zero. A simplified Volterra series analysis is used to qualitatively explain how the envelope Termination impacts linearity.

Mike Martone - One of the best experts on this subject based on the ideXlab platform.

  • Recovery System Termination Load Reduction through the use of a Central Load Core
    International Balloon Technology Conference, 1991
    Co-Authors: E. Robbins, Mike Martone
    Abstract:

    A study is presented of the development and testing of a parachute central Load core, an adaptive device whose primary function is to minimize parachute stored elastic energy while providing adequate rotational stiffness to prevent shroud line fouling from twisting and sufficient resistive torque for any balloon gondola positioning requirements. Empirical relations are given for the uninhibited drag area growth which are derived in the classical nondimensional form. Attention is given to development considerations and design along with model simulations, small and midscale drop test data, full-scale flight data, and instrumentation applications.