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Wang Y.,Hohai University | Zhu F.,Science and Technology on Antenna and Microwave Laboratory | Zhu F.,University of Kent | Zhu F.,China Electronics Technology Group Corporation | Gao S.,University of Kent
Progress In Electromagnetics Research C | Year: 2015

An integrated eight-element antenna array has been proposed for ultra-wideband (UWB) applications. It consists of eight UWB antenna elements and an eight-way binary-tree modified Wilkinson power divider. Any two adjacent elements in the array are connected to each other and share a common side, thus leading to a connected antenna array. Moreover, this arrangement can be utilized to avoid grating lobe level at higher frequencies. Each antenna element comprises a square ring patch and is excited by a tapered balun to achieve low cross-polarization levels. In order to validate the design, a prototype has been fabricated and measured. Both simulated and measured results confirm that the proposed integrated antenna array achieves a good performance of a reflection coefficient below −10 dB from 2.9GHz to 10.8GHz, including stable radiation patterns with low side lobe and cross-polarization levels, thus the antenna is promising for applications in UWB imaging systems. © 2015, Electromagnetics Academy. All rights reserved. Source


Zhu F.,China Electronics Technology Group Corporation | Zhu F.,Science and Technology on Antenna and Microwave Laboratory | Zhu F.,University of Kent | Gao S.,University of Kent
2014 31th URSI General Assembly and Scientific Symposium, URSI GASS 2014 | Year: 2014

This paper has presented the design and implementation of a novel dual-polarized ultra-wideband (UWB) patch antenna. A square slot is inserted in the center of the radiating patch and attached to four inclined triangular patches. The vertices of the triangular patches are connected to two pair of microstrip lines on the bottom layer of the grounded FR4 substrate. To achieve dual orthogonal polarizations with high isolation, two tapered baluns are utilized to excite the antenna. For the purpose of validating the design methodology, a prototype has been fabricated and measured. Both the simulation and measurement confirm that, the proposed dual-polarized UWB patch antenna can achieve a wide frequency band from 3 to over 11 GHz with high isolation of over 28 dB. © 2014 IEEE. Source


Ren B.,China Electronics Technology Group Corporation | Ren B.,Science and Technology on Antenna and Microwave Laboratory | Wang Y.,Hohai University | Zhu F.,China Electronics Technology Group Corporation | Zhu F.,Science and Technology on Antenna and Microwave Laboratory
Asia-Pacific Microwave Conference Proceedings, APMC | Year: 2016

The design, fabrication and measurement of a 4μ8 open-ended waveguide array antenna operating over 3-3.4 GHz are presented. Each waveguide is connected with a ferrite phase shifter which provides phase delay to ensure electrically scanning. Furthermore, the waveguide is partially filled of dielectric to enable better matching of the waveguide to free space. Measured results have confirmed that, the active VSWR of the central element is less than 2 over the operating frequency band in the required scanning space. © 2015 IEEE. Source


Li Y.,Science and Technology on Antenna and Microwave Laboratory | He B.,Science and Technology on Antenna and Microwave Laboratory | Zhang D.,Science and Technology on Antenna and Microwave Laboratory
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2015

Antenna arrays are the core hardware of phased array radars. In this paper, the integration technology of phased arrays is discussed from three aspects. Firstly, antennas and feedline are designed and optimized from the system perspective. By using a new coupler, the size of the antenna array is reduced by 25%, and the performance of the array is improved. Secondly, the design technology of three-dimensional microwave and digital hybrid circuit is adopted. The three-dimensional microwave circuit is designed through the analysis on via-hole. The digital circuit used to control wave-beam is designed taking into account the layout, shield, matching circuit and so on. Thirdly, by applying the co-simulation techniques for RF and digital signals, the resonance in Ku-band is restrained, the reflection is reduced, and the performance of the digital circuit is improved. An example is given to validate the design method. The optimal allocation of array telecommunication, array structure and system resources is realized. The integration and miniaturization of the antenna array are achieved. Copyright © 2015 by Editorial Department of Chinese Journal of Radio Science Source


Shen J.Q.,Depertment of Antenna and Microwave Technology | Zhou Z.P.,Science and Technology on Antenna and Microwave Laboratory | Zhang Z.B.,Science and Technology on Antenna and Microwave Laboratory | Wei J.,Science and Technology on Antenna and Microwave Laboratory | Zhang H.L.,Depertment of Antenna and Microwave Technology
2012 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2012 - Proceedings | Year: 2012

In this paper, some leaky-wave absorbent harmonic filters are presented that developed by NRIET which constructed by a primary rectangular waveguide and single, double, three series accessorial rectangular waveguide loads located at the wide or narrow face of the primary waveguide. The method of equivalent circuit is also presented to analyzed this type of waveguide leaky-wave harmonic filter. The tested results are also shown that all of the performances at pass band and stop band are all well. © 2012 IEEE. Source

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