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48 results on '"Zong, Xianzheng"'

1. Model-Driven Compressive Spherical Array Sampling of Antenna Near Field Using Accelerated Pseudoskeleton Tensor Approximation

Author

Sun, Weirong, Zhang, Ying, Zong, Xianzheng, and Wu, Chunhua

Abstract

The antenna near-field samples (NFSs) are obtained by a circular array of probes (CAP) in spherical array sampling systems. In order to reduce sampling time, this article proposes a compressive spherical array sampling technique based on pseudoskeleton tensor approximation (PSTA). Specifically, Huygens’ principle and the method of moments (MoM) are applied to construct a tensor-based radiation model. Then, in order to realize the compression of NFSs and, thus, to reduce the sampling effort, the skeleton sampling positions of CAP are determined via PSTA of the tensor model, where NFSs in nonskeleton sampling positions can be computed from those in skeleton sampling positions. Moreover, a fast algorithm is developed to accelerate the PSTA of the tensor model. The ring antenna array and the patch antenna arrays are used to validate that the proposed method is applicable to antennas with different shapes or multibeam techniques. Numerical experiments show that the proposed method can determine the skeleton sampling positions with high computation efficiency and reduce the number of samples by 50% compared with uniform sampling.

Published
2024
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10. Numerical analysis of cone/pyramid-shaped antennas using wires/surface-to-surface junction basis

Author

Zong, Xianzheng, Nie, Zaiping, and Que, Xiaofeng

Subjects
Antennas (Electronics) -- Design and construction, Numerical analysis -- Methods, Finite element method -- Usage, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Two modified junction basis functions were presented based on the principles of current continuity and zero charge. A new type of wires-to-surface basis was used to analyze wire conical/pyramidal monopoles mounted on conducting plates more efficiently than with the traditional wire-to-surface junction element: To obtain an uniform current distribution along all the wire elements of the antenna, the mesh size and the iterative tolerance can be set as 0.08-0.10[lambda] and le-3 to le-2 with this new basis function or its multiple version, while these two parameters need to be about 0.04[lambda] and le-5, respectively, as for the old one. A single-point surface-to-surface junction basis function was introduced to resolve thin sheet pyramidal or conical monopole antennas or any other single-point surface-to-surface junction problems which role the traditional junction basis is not yet suited to. Index Terms--Antennas, basis functions, method of moments (MoM), surfaces, wires.

Published
2009

48. A novel broadband high-isolation cross dipole utilizing strong mutual coupling.

Author

Bao, Zengdi, Zong, Xianzheng, and Nie, Zaiping

Abstract

A novel broadband cross dipole with high isolation and low cross polarization is presented in this paper. By skillfully utilizing the strong mutual coupling between the two dipoles, very good impedance match, sufficiently high isolation and low cross polarization can be achieved simultaneously. To get a directional radiation pattern, a metal reflector is placed under the antenna. The simulated measured results show that a more than 56% impedance bandwidth for SWR<1.5 from 1.66GHz to 2.96GHz is achieved, within which the port isolation is larger than 30dB. As an important advantage, the input impedance of the antenna can be changed within certain limits by properly adjusting the configuration, thus the antenna can be fed directly by 50-ohm coaxial cables without using impedance transformers. Particularly, the mechanisms for wide impedance bandwidth and high port isolation are discussed in this paper. [ABSTRACT FROM PUBLISHER]

Published
2013

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