Huiying Qi

Adaptive dynamic meta particle swarm optimization algorithm and application in 3D power pattern synthesis for conformal arrays

The adaptive dynamic Meta particle swarm optimization (ADMPSO) algorithm is proposed to apply in power patterns synthesis for conformal arrays. To begin, the dominated subgroup and nondominated subgroup are defined on the basis of traditional Meta particle swarm. Meanwhile, the adaptive dynamic modulating for multiple-subgroup is realized by introducing the downsizing of nondominated subgroup, and the expansion of dominated subgroup, which improves both the convergence speed and exploration ability significantly. Finally, based on the target fitness function built for power pattern synthesis in arbitrary arrays, ADMPSO algorithm has been used in synthesizing three dimensional (3D) power patterns for conical array, with all polarization fields considered.

EFFICIENT ANALYSIS OF RECTANGULAR-SHAPE METAMATERIALS USING P-CBFM/P-FFT METHOD

In this paper, we introduce an efficient algorithm to analyze metamaterials (MTM), which can be finite periodic structures with tight coupling between nearby cells. Firstly, the algorithm, based on method of moments (MoM), uses hybrid volume-surface integral equation (VSIE) to analyze composite dielectric-conductor objects, then, the characteristic basis function method (CBFM) and precorrected-fast Fourier transform (p-FFT) algorithm are combined to accelerate the calculation of equations, based on which, metamaterials composed of connected periodic cells can be analyzed efficiently.

A Design of Wide Band and Wide Beam Cavity-Backed Slot Antenna Array with Slant Polarization

Design of antenna array under the limitation of restricted size is a challenging problem. Cavity-backed slot antenna is widely used because of its advantages of small size, wide band, and wide beam. In this paper, a design of wide band and wide beam cavity-backed slot antenna array with the slant polarization is proposed. To obtain wide band and wide beam with limited size, the inverted microstrip-fed cavity-backed slot antenna (IMF-CBSA) is adopted as the element of 1 × 4 antenna array. The slant polarized antennas and their feeding networks are adopted because of their simple structures. The performance of the proposed antenna array is verified by the simulations and experiments. The measured VSWR < 2 bandwidth is 55% at the center frequency 21.8 GHz, and the gain is larger than 12.2 dB. Experimental results demonstrate that the proposed design achieves wide band and beam with the size of 68 mm × 56 mm × 14.5 mm.

Broadband cavity-backed slot antenna array with 45° slant polarization

The radiation characteristics of a cavity-backed four-slot antenna array are investigated in this paper. By employing cavity-backed slots antenna element, the antenna array has wide bandwidth and wide beam width. The feeding network of the antenna array mainly consists of shielded microstrip line. Both simulated and measured results of the antenna return loss and radiation patterns are presented. The measured VSWR<;2 bandwidth is 55% of the center frequency 21.8GHz. It is shown that using shielded microstrip line leads to better radiation performances. Besides, good agreement can be observed between the measured radiation patterns and the simulated values. These findings may provide useful insights and guidelines for the design of 45° slant linear polarization wideband antenna array in K-band with wide beam.

Full-polarization conformal phased array with transmit digital beam-forming

Firstly, we designed a dual-polarized microstrip antenna with high isolation between two ports, then, a dual-polarized conformal phased array on cylindrical with twelve elements is constructed, by using direct digital frequency synthesis (DDS) technology, transmitted beam can be formed digitally, besides, the full-polarization of the array can be controlled accurately and immediately. At last, based on the measured element patterns, the efficiency of the synthesis algorithm for radiation patterns is demonstrated by experiments. It has also been proved that, the dual-polarized array performs better in the inhibition of cross-polarization components than the single-polarization array.

Simplifying analysis for symmetry conformal array with arbitrary excitation weights

The simplifying analysis for single symmetry conformal array with arbitrary excitation weights is proposed. By substituting the original array with a magnetic and an electronic symmetry array with calculated excitation weights, the original conformal array can be analyzed from the half geometry, which reduces memory requirement to half. Finally, a single symmetry sectoral cylinder microstrip array is employed to validate the proposed technique.