Abstract-A compact multiband handset antenna including MIMO antenna operation for LTE 13 band (746 ∼ 787 MHz) applications is proposed. The proposed antennas are separately located on the top and bottom portions of a mobile handset in order to use the antenna area more effectively. The proposed antenna achieves isolations of higher than 14 dB, enveloped correlation coefficients (ECC) of less than 0.25, and total efficiencies of greater than 40%. The operating frequency bands of Antenna 1 and Antenna 2 include the LTE 13 (746 ∼ 787 MHz)/DCS/PCS/UMTS (1710 ∼ 2170 MHz) bands and the LTE 13 (746 ∼ 787 MHz)/GSM850/900 (824 ∼ 960 MHz) bands, respectively.

developed empirical formulation for the drain current dispersion allows obtaining remarkably improvements during the simulation of the output locus at both LF and HF, as shown in Figs. 7À9 by comparing the models with and without such empirical formulation. As far as the input locus at HF is concerned, only the simulations of model accounting for LF dispersion are illustrated in Figs. 7(a) and 8(a), because no significant differences have been observed between the two models, confirming that the dispersion associated to the nonlinear capacitive effects can be disregarded in the investigated case. The input locus at 2 MHz is not reported since not only the conduction gate current but also the displacement gate current is negligible, due to the LF operation. CONCLUSIONSWe have presented a microwave large-signal modeling approach for GaN HEMTs. The proposed technique accounts for LF dispersion as well as HF nonquasi-static effects. The validity of the developed equivalent circuit model has been completely and successfully demonstrated by the good agreement between model predictions and low-and HF large-signal measurements under different operating conditions. ACKNOWLEDGMENTS This work was supported by ''IMT-ARSEL'' project prot. RBIP06R9X5 with financial support by Italian MIUR, K.U.Leuven-OT project ''Large-signal characterization and modelling of devices and circuits at mmwave frequencies,'' and FWO project ''Use of modulated signals to validate and construct nonlinear models for microwave components.'' ABSTRACT: The effect of a frequency-selective surface (FSS) on enhancing the isolation between a donor and a coverage antenna for indoor WCDMA repeater antenna systems is presented. A unit cell of

Proliferating cell nuclear antigen (PCNA) is a DNA clamp that functions in key roles for DNA replication and repair. After the completion of DNA synthesis, PCNA should be unloaded from DNA in a timely way. The ATAD5-RFC-Like Complex (ATAD5-RLC) unloads PCNA from DNA. However, the mechanism of the PCNA-unloading process remains unclear. In this study, we determined the minimal PCNA-unloading domain (ULD) of ATAD5. We identified several motifs in the ATAD5 ULD that are essential in the PCNA-unloading process. The C-terminus of ULD is required for the stable association of RFC2-5 for active RLC formation. The N-terminus of ULD participates in the opening of the PCNA ring. ATAD5-RLC was more robustly bound to open-liable PCNA compared to the wild type. These results suggest that distinct motifs of the ATAD5 ULD participate in each step of the PCNA-unloading process.

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