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In order to study the feasibility of co-time co-frequency full-duplex (CCFD) relay, it is crucial to characterize the self-interference (SI) in practical deployment scenarios. However, modeling the SI channels is still an open issue. In this paper, a measurement campaign on the SI channels for relay communications in a dense urban scenario is presented. The transmitting and receiving antennas were...
A geomechanical model and a multiphase black oilmodel are iteratively coupled in this paper. Parallel computingis employed to handle large scale problems by benefiting fromits features of distributed memory storage and efficient runtimereduction. The finite element method and the finite differencemethod are employed to discretize the two models, respectively. The geomechanical model is developed with...
A new family of radial-angular-Rn transformation formulas are proposed for the singularity cancellation technique. To cancel out the singularity in the integral kernels, an ideal Jacobian of the coordinate transformations is required. For the first order of singular coupling integral kernels, a new augmented radial-angular-R1 transformation is proposed. For the second order of singular coupling integral...
The received signal correlation between different ports of an antenna array can be calculated from the radiation pattern orthogonality. Through the power conservation law, it is possible to estimate the pattern orthogonality coefficient from the scattering parameters for lossless antenna arrays. For lossy antenna arrays, e.g., due to losses in a decoupling network, the scattering parameters are not...
A novel 1-1-3 type composite is proposed to increase the electromechanical coupling coefficient. Relaxor ferroelectric single crystal is cut into columns and surrounded by soft polymer. The other kind of hard polymer is manufactured to form a 3D grid structure. The relaxor ferroelectric single crystal and soft polymer are located in lattice of the hard polymer. The single crystal and soft polymer...
Compact antenna arrays are more and more used in mobile terminals with MIMO technology. However, mutual couplings between the radiation elements degrade the performance of arrays with respect to radiation efficiency, diversity, impedance matching and so on. In this paper, a simple compact three-element printed diversity array operating around 6 GHz is designed and measured. This array consists of...
The design of a highly compact four-element monopole antenna array operating at 2.45 GHz is provided. The four radiation elements are symmetrically placed and the minimum distance between them is 0.07λ. The input ports are decoupled by a simple decoupling network, which is a one-layer printed circuit board only containing transmission lines on low-cost FR 4 substrate. The proposed array shows good...
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